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Articoli di riviste sul tema "Rock joints"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 6 settembre 2023

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1

Liu, Chao, Mingyang Yang, Haoyu Han, and Wenping Yue. "Numerical simulation of fracture characteristics of jointed rock masses under blasting load." Engineering Computations 36, no. 6 (2019): 1835–51. http://dx.doi.org/10.1108/ec-09-2018-0404.

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Abstract (sommario):

Purpose To study fracture characteristics of jointed rock masses under blasting load, the RFPA2D analysis software for dynamic fracture of rocks based on the finite element method and statistical damage theory was used. Design/methodology/approach On this basis, this research simulated the fracture process of rock masses in blasting with different joint geometrical characteristics and mainly analysed the influences of distance from joints to blasting holes, the length of joints, the number of joints and joint angle on fracture of rock masses. Findings The calculation results show that with the

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2

Zhu, Wei, Liang Gao, Yingai Zhao, Chao Yang, Wei Sun, and Pengqiang Yu. "Stability Analysis of Jointed Rock Cutting Slope Based on Discrete Element Method." Advances in Civil Engineering 2022 (July 16, 2022): 1–10. http://dx.doi.org/10.1155/2022/4915820.

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The joints in the rock mass are essential for the stability of rocky slopes, and the destabilization damage of the slope is often directly related to the joints. In this study, in order to reveal the instability process and mechanism of rock slopes from a microscale perspective, the DEM simulations for rocky slopes of the K88 + 400∼K88 + 540 section of Zhongkai Expressway are carried out considering the influence of joints. Based on the findings of the on-site jointed structural surfaces, a rocky slope model containing two sets of intermittent joints was constructed, and the linear parallel bo

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3

Hu, Gaojian, and Gang Ma. "Size effect of parallel-joint spacing on uniaxial compressive strength of rock." PLOS ONE 16, no. 9 (2021): e0257245. http://dx.doi.org/10.1371/journal.pone.0257245.

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The existence of parallel joints has an impact on the size effect of the uniaxial compressive strength of rock, but the relationship is yet to be obtained. In this paper, the influence of parallel-joint spacing on the size effect and characteristic size of rock uniaxial compressive strength is studied by establishing five types of parallel-joint-spacing simulation schemes. The influence of parallel-joint spacing on the size effect of rock uniaxial compressive strength is explored by analyzing the stress–strain curves of rocks with different parallel-joint spacings and rock sizes. The relations

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4

Lei, Wei Dong, Xue Feng He, and Rui Chen. "Verification of UDEC Modeling 1-D Wave Propagation in Rocks." Applied Mechanics and Materials 90-93 (September 2011): 1998–2001. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.1998.

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Three cases for 1-D wave propagation in ideal elastic rock, through single rock joint and multiple parallel rock joints are used to verify 1-D wave propagation in rocks. For the case for 1-D wave propagation through single rock joint, the magnitude of transmission coefficient obtained from UDEC results is compared with that obtained from the analytical solution. For 1-D wave propagation through multiple parallel joints, the magnitude of transmission coefficient obtained from UDEC results is compared with that obtained from the method of characteristics. For all these cases, UDEC results agree

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5

Yang, Dong Mei, and Xiang Bo Qiu. "A Constitutive Model for Rock Joints under Cyclic Loading." Advanced Materials Research 243-249 (May 2011): 2211–15. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.2211.

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Cyclic loads are commonly encountered in geotechnical engineering; however most constitutive models do not account for the effect that such loads can have on the mechanical behaviour of soils and rocks. This work is concerned with the behaviour of jointed rock and, as the overall mechanical behaviour of jointed rock is usually dominated by the mechanical behaviour of the joints, it is focused on the behaviour of rock joints under cyclic loads. In particular, an extension of the existed constitutive model for cyclically loaded rock joints is presented. Variations of rock joint stiffness in both

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6

FIFER BIZJAK, Karmen, and Rok VEZOČNIK. "Prediction of the peak shear strength of the rock joints with artificial neural networks." Geologija 65, no. 2 (2022): 149–58. http://dx.doi.org/10.5474/geologija.2022.009.

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With the development of computer technology, artificial neural networks are becoming increasingly useful in the field of engineering geology and geotechnics. With artificial neural networks, the geomechanical properties of rocks or their behaviour could be predicted under different stress conditions. Slope failures or underground excavations in rocks mostly occurred through joints, which are essential for the stability of geotechnical structures. This is why the peak shear strength of a rock joint is the most important parameter for a rock mass stability. Testing of the shear characteristics o

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7

Guo, Jiaqi, Lipan Cheng, Yongbiao Lai, Yongchao Tian, and Lu Li. "Study on Shear Mechanical Properties and Microscopic Failure Mechanism of Dentate Joints Based on DEM and Laboratory Tests." Buildings 12, no. 9 (2022): 1485. http://dx.doi.org/10.3390/buildings12091485.

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The stability control of the surrounding rock is greatly influenced by the rock joint’s shear mechanical characteristics and deformation failure mechanism. A numerical model of the dentate joints was created using a particle flow discrete element method (DEM). To study the shear mechanical behavior and damage evolution characteristics of the joints, a numerical simulation of the joints shear test under the same normal stress was conducted. Additionally, the joints’ shear failure mechanism and failure mode were investigated from a microscopic perspective in conjunction with laboratory tests. Th

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8

Hu, Gaojian, Yu Li, and Gang Ma. "Research on the size effect of roughness on rock uniaxial compressive strength and characteristic strength." Science and Engineering of Composite Materials 28, no. 1 (2021): 613–27. http://dx.doi.org/10.1515/secm-2021-0058.

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Abstract The joint roughness has an influence on the uniaxial compressive strength (UCS) and characteristic strength of the rock, but the relationship of the influence is yet to be obtained. In this article, the influence of the size of the rock with rough joints on the UCS and the influence of the size effect of roughness on the UCS are studied by establishing 11 sets of numerical simulation schemes, a total of 30 working conditions. The stress–strain curve law of rocks with different roughness and sizes is analyzed, and the relationship between UCS and the size of rock with rough joints, joi

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9

Cheng, Ping, Yanbo Li, Caiwu Lu, Song Jiang, and Hanhua Xu. "Study on Blasting Effect Optimization to Promote Sustainable Mining under Frozen Conditions." Sustainability 14, no. 24 (2022): 16479. http://dx.doi.org/10.3390/su142416479.

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In order to respond to the theme of national green and healthy sustainable development and in response to the problems of large block rates and pollution of the environment after the blast mining of underground rocks in alpine areas, we conducted research on the joints of underground rocks and the blastability of frozen rocks. According to the actual geological conditions of an underground mine blasting in Heilongjiang Province, three kinds of joint blasting geometric models were established. The rock mass blasting process of different types of joints was simulated by LS-DYNA software and the

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10

Shen, Jiayi, Chenhao Sun, Huajie Huang, Jiawang Chen, and Chuangzhou Wu. "Scale Effects on Shear Strength of Rough Rock Joints Caused by Normal Stress Conditions." Sustainability 15, no. 9 (2023): 7520. http://dx.doi.org/10.3390/su15097520.

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Abstract (sommario):

Scale effects on the mechanical behavior of rock joints have been extensively studied in rocks and rock-like materials. However, limited attention has been paid to understanding scale effects on the shear strength of rock joints in relation to normal stress σn applied to rock samples under direct shear tests. In this research, a two-dimensional particle flow code (PFC2D) is adopted to build a synthetic sandstone rock model with a standard joint roughness coefficient (JRC) profile. The manufactured rock model, which is adjusted by the experiment data and tested by the empirical Barton’s shear s

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11

Men, Xiaoxi, Jiren Li, and Zhihui Han. "Fracture Propagation Behavior of Jointed Rocks in Hydraulic Fracturing." Advances in Materials Science and Engineering 2018 (July 29, 2018): 1–12. http://dx.doi.org/10.1155/2018/9461284.

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Jointed rocks are typical examples of heterogeneous materials with joints. The existence of joints influences the physical properties of rock mass and propagation of fractures, which can affect production operations in engineering. A series of simulations is performed to understand the failure patterns and fracture propagation behavior of jointed rocks in hydraulic fracturing. Three points, that is, dip-angle joint, joint strength, and complex joints, are considered in the simulations. Results demonstrate three basic kinds of hydraulic fractures on jointed rock, namely, along the joint, across

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12

Chen, Siyuan. "Model Test Study on the Transmission Law of Explosion Stress Wave in Rock Mass with Filling Joints." Frontiers in Science and Engineering 3, no. 2 (2023): 11–20. http://dx.doi.org/10.54691/fse.v3i2.3662.

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In order to study the propagation and attenuation law of explosive stress wave in rock mass with filling joints, and consider the influence of different crustal stress conditions, different strength mortar is used to simulate rock mass and joints, and the multi-functional simulation test device of geotechnical engineering is used to carry out explosive model test research, the influence characteristics of different in-situ stress conditions on the attenuation of explosive stress wave in rock mass with different thickness filling joints are analyzed, and obtain the transmission law of stress wa

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13

Han, Guansheng, Fei Xiong, Yu Zhou, Leibo Song, and Xingkai Wang. "Research Progress on Shear Characteristics of Rock Joints under Constant Normal Stiffness Boundary Conditions." Shock and Vibration 2021 (September 1, 2021): 1–6. http://dx.doi.org/10.1155/2021/9670151.

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The constant normal stiffness (CNS) boundary condition is more representative for the underground engineering, in which the shear-induced dilation is restricted by surrounding rocks, resulting in an increase in the normal stress. Therefore, the use of CNS boundary conditions in the research of shear-slip failure of underground rock engineering is more in line with the actual situation. Taking the instability and failure of surrounding rock in underground engineering as the background, the present study introduces the engineering background of CNS boundary conditions and the research progress o

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14

Yang, Wendong, Guizhi Li, PG Ranjith, and Lindong Fang. "An experimental study of mechanical behavior of brittle rock-like specimens with multi-non-persistent joints under uniaxial compression and damage analysis." International Journal of Damage Mechanics 28, no. 10 (2019): 1490–522. http://dx.doi.org/10.1177/1056789519832651.

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The mechanical behavior of jointed rock masses significantly affects the stability of rock engineering applications. In this paper, the peak strength, Young's modulus and failure patterns of brittle rock-like specimens with multi-non-persistent joints under uniaxial compression are investigated. The joint geometry is defined by four factors: joint angle, spacing, joint length, and rock bridge length. The experiment results show that the joint angle has the greatest influence on the peak strength and Young's modulus of specimens, followed by joint length. A damage mechanical theory is adopted w

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15

Zadhesh, Jamal, and Abbas Majdi. "MATHEMATICAL DETERMINATION OF ROCK JOINTS MORPHOLOGICAL PROFILE." Rudarsko-geološko-naftni zbornik 37, no. 5 (2022): 117–31. http://dx.doi.org/10.17794/rgn.2022.5.10.

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Determining the geometric or morphology and mechanical properties of joints and geomechanics of intact rock is a vitally important issue in predicting the behaviour of structures built inside or on rock masses. The joint morphology is significant because it affects the strength of the rock mass and controls the stability of the structures related to the rock masses. Until recently, joint morphology was introduced in a simple form which brought about models that are far from the inherent state of a rock joint. The work presented in this research introduces a new model to represent rock joint mo

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16

Cheng, Xianzhen, Hengjie Luan, Yujing Jiang, Sunhao Zhang, and Chuanyang Jia. "Experimental Study on Shear Behavior and Failure Mechanism of Bolted Heterogeneous Rock Joints under Different Anchorage Conditions." Geofluids 2021 (June 7, 2021): 1–14. http://dx.doi.org/10.1155/2021/9958352.

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Despite their frequent natural occurrence and engineering encounter, heterogeneous rock joints (rock joints with different lithological characters on both sides of the joint surface) have been studied much less systematically. To study the shear behavior and failure mechanism of bolted heterogeneous rock joints, laboratory tests were performed on the heterogeneous rock joints having different joint roughness coefficients (JRC) under different anchorage conditions. The results indicate that shear strength increases with the increase of JRC, showing exponential growth. Under the same roughness,

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17

Sun, Mingzhi, Gaojian Hu, Jianli Hu, et al. "Simulation Study on the Size Effect of Secant Modulus of Rocks Containing Rough Joints." Sustainability 14, no. 23 (2022): 15640. http://dx.doi.org/10.3390/su142315640.

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Abstract (sommario):

The secant modulus reflects the ability of rocks to resist deformation, and it is mostly used to evaluate rock strength and deformation evolution. Due to the existence of rough joints in rocks, the secant modulus changes according to rock size. Therefore, it is very important to effectively obtain the secant modulus to evaluate rough-jointed rock deformation. In this paper, the regression analysis method is used, and 25 sets of simulation models are set up to discuss the influence of joint roughness and rock size on the rock secant modulus. The research shows that the secant modulus increases

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18

Xu, Lei, and Qing Wen Ren. "Shear Failure Mechanism of Infilling Rock Joints and its PFC Simulation." Applied Mechanics and Materials 723 (January 2015): 317–21. http://dx.doi.org/10.4028/www.scientific.net/amm.723.317.

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Infilling rock joints widely exist in natural rock masses, and the shear failure of infilling rock joints plays an important role in the instability of rock masses. In order to study the shear failure mechanism of infilling rock joints, Particle Flow Code is used to simulate the direct shear test of infilling rock joints. The PFC models with different infilling thickness are established firstly, and then the procedures of PFC simulation are described. In the end, the shear failure process of infilling rock joints with different infilling thickness is simulated. Based on the PFC simulation resu

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19

Hu, Gaojian, Gang Ma, Jie Liu, and Kuan Qi. "Size Effect of the Number of Parallel Joints on Uniaxial Compressive Strength and Characteristic Strength." Minerals 12, no. 1 (2022): 62. http://dx.doi.org/10.3390/min12010062.

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The number of parallel joints has an impact on the size effect of the uniaxial compressive strength and characteristic strength of a rock; however, the relationships between them are yet to be derived. We studied the influence of the number of joints and rock size on the uniaxial compressive strength of the rock. This study established ten numerical simulation programs using numerical simulations and the RFPA software. Stress–strain curves of different numbers of parallel joints and sizes of rocks were analyzed. Relationships between the uniaxial compressive strength and number of parallel joi

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20

Huang, Shibing, Haowei Cai, Zekun Xin, and Gang Liu. "The temperature-dependent shear strength of ice-filled joints in rock mass considering the effect of joint roughness, opening and shear rates." Cryosphere 17, no. 3 (2023): 1205–23. http://dx.doi.org/10.5194/tc-17-1205-2023.

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Abstract. Global warming causes many rockfall activities in alpine mountains, especially when ice-filled joints in the rock mass become thawed. The warming and thawing of frozen soils and intact rocks have been widely studied in the past several decades; however, the variation of shear strengths of ice-filled joints is not fully understood. In this study, a series of compression–shear experiments were conducted to investigate the shear strength of ice-filled rock joints by considering the effects of joint roughness, temperature, opening, shear rates and normal stress. The joint roughness can i

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21

Xia, Caichu, Man Huang, Xin Qian, Chenjie Hong, Zhanyou Luo, and Shigui Du. "Novel Intelligent Approach for Peak Shear Strength Assessment of Rock Joints on the Basis of the Relevance Vector Machine." Mathematical Problems in Engineering 2019 (December 19, 2019): 1–10. http://dx.doi.org/10.1155/2019/3182736.

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This study mainly establishes a novel intelligent assessment model for peak shear strength of rock joints based on the relevance vector machine (RVM). RVM is a state-of-the-art soft computing technique that has been rarely utilized in joint shear strength assessment. To establish the hybrid intelligent model, three-dimensional scanning tests and direct shear tests on 36 granite joint specimens were conducted. The peak shear strength ratio (τp/σn) is perceived as an explanation of four types of influencing factors, including joint surface roughness, strength of rock material, basic friction ang

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22

Chen, Baoping, Bin Gong, Shanyong Wang, and Chun’an Tang. "Research on Zonal Disintegration Characteristics and Failure Mechanisms of Deep Tunnel in Jointed Rock Mass with Strength Reduction Method." Mathematics 10, no. 6 (2022): 922. http://dx.doi.org/10.3390/math10060922.

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To understand the fracture features of zonal disintegration and reveal the failure mechanisms of circle tunnels excavated in deep jointed rock masses, a series of three-dimensional heterogeneous models considering varying joint dip angles are established. The strength reduction method is embedded in the RFPA method to achieve the gradual fracture process, macro failure mode and safety factor, and to reproduce the characteristic fracture phenomenon of deep rock masses, i.e., zonal disintegration. The mechanical mechanisms and acoustic emission energy of surrounding rocks during the different st

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23

Ping, Yang, and Shu Chen Li. "Triaxial Compression Experimental Study on Post-Peak Deformation Characteristics of Rock Masses with Persistent Joints." Advanced Materials Research 1030-1032 (September 2014): 1074–77. http://dx.doi.org/10.4028/www.scientific.net/amr.1030-1032.1074.

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Controlling the stability of surrounding rocks in underground excavations during in-depth resource development must be confronted with post-peak deformation and failure problems of jointed rock masses. This paper describes routine triaxial compression testing on standard cylinder specimen with persistent joints in different inclinations and under different confining pressures, and analyzes deformation characteristics of rock masses with persistent joints in different inclinations and under different confining pressures. Test results show that the peak strength, residual strength, and peak stra

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24

Cha, Minsu, Gye-Chun Cho, and J. Carlos Santamarina. "Long-wavelength P-wave and S-wave propagation in jointed rock masses." GEOPHYSICS 74, no. 5 (2009): E205—E214. http://dx.doi.org/10.1190/1.3196240.

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Field data suggest that stress level and joint condition affect shear-wave propagation in jointed rock masses. However, the study of long-wavelength propagation in a jointed rock mass is challenging in the laboratory, and limited data are available under controlled test conditions. Long-wavelength P-wave and S-wave propagation normal to joints, using an axially loaded jointed column device, reproduces a range of joint conditions. The effects of the normal stress, loading history, joint spacing, matched surface topography (i.e., joint roughness), joint cementation (e.g., after grouting), joint

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25

Sitharam, T. G., M. Ramulu, and V. B. Maji. "Static and Dynamic Elastic Modulus of Jointed Rock Mass." International Journal of Geotechnical Earthquake Engineering 1, no. 2 (2010): 89–112. http://dx.doi.org/10.4018/jgee.2010070107.

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In this paper the compressive strength/elastic modulus of the jointed rock mass was estimated as a function of intact rock strength/modulus and joint factor. The joint factor reflects the combined effect of joint frequency, joint inclination and joint strength. Therefore, having known the intact rock properties and the joint factor, jointed rock properties can be estimated. The test results indicated that the rock mass strength decreases with an increase in the joint frequency and a sharp transition was observed from brittle to ductile behaviour with an increase in the number of joints. It was

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26

Du, Shigui, Huicai Gao, Yunjin Hu, Man Huang, and Hua Zhao. "A New Method for Determination of Joint Roughness Coefficient of Rock Joints." Mathematical Problems in Engineering 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/634573.

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The joint roughness coefficient (JRC) of rock joints has the characteristic of scale effect. JRC measured on small-size exposed rock joints should be evaluated by JRC scale effect in order to obtain the JRC of actual-scale rock joints, since field rock joints are hardly fully exposed or well saved. Based on the validity analysis of JRC scale effect, concepts of rate of JRC scale effect and effective length of JRC scale effect were proposed. Then, a graphic method for determination of the effective length of JRC scale effect was established. Study results show that the JRC of actual-scale rock

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27

Li, Xiao, Xinquan Wang, Kangyu Wang, Hongguo Diao, and He Zhang. "Damage Evolution of Rocks Containing a Set of Cross-Joints Based on Acoustic Emission Characteristics." Advances in Materials Science and Engineering 2022 (September 30, 2022): 1–15. http://dx.doi.org/10.1155/2022/4120287.

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The problem of damage rupture of jointed rocks is a hot topic of research in underground tunnel engineering. In this paper, the damage evolution characteristics of rocks containing a set of cross-joints are investigated based on particle flow code (PFC). Firstly, the jointed rock models, such as rock models with different joint cross-angles and with different joint lengths, are established based on PFC. Then, the uniaxial compression mechanical properties and acoustic emission (AE) evolution characteristics of different jointed rocks are analyzed. Finally, the damage evolution characteristics

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28

Naime, W., and R. García. "The rock mass and the development of joints during the tunnel excavation." IOP Conference Series: Earth and Environmental Science 1124, no. 1 (2023): 012058. http://dx.doi.org/10.1088/1755-1315/1124/1/012058.

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Abstract The term joint has been historically used imprecisely when carrying out geomechanical characterization of rock mass. The current classification systems consider the different fracture planes simply as they are observed visually, assuming independence of dimensions and other fixed patterns with depth. That can lead to over-design underground works. Joint patterns in a rock mass depend on the change of the stress field acting on the rock from its original confinement state. The stress field on the rock mass is not constant and varies with changing distance in any underground excavation.

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29

Ye, Jun, Rui Yong, Qi-Feng Liang, Man Huang, and Shi-Gui Du. "Neutrosophic Functions of the Joint Roughness Coefficient and the Shear Strength: A Case Study from the Pyroclastic Rock Mass in Shaoxing City, China." Mathematical Problems in Engineering 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/4825709.

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Many studies have been carried out to investigate the scale effect on the shear behavior of rock joints. However, existing methods are difficult to determinate the joint roughness coefficient (JRC) and the shear strength of rock joints with incomplete and indeterminate information; the nature of scale dependency of rock joints is still unknown and remains an ongoing debate. Thus, this paper establishes two neutrosophic functions of the JRC values and the shear strength based on neutrosophic theory to express and handle the incomplete and indeterminate problems in the analyses of the JRC and th

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30

Liu, Hongyan, and Xiaoping Yuan. "A damage constitutive model for rock mass with persistent joints considering joint shear strength." Canadian Geotechnical Journal 52, no. 8 (2015): 1136–43. http://dx.doi.org/10.1139/cgj-2014-0252.

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Microcracks and joints, two types of flaws that appear in a rock mass, affect both the rock mass strength and deformability. A model that can simultaneously reflect the effect of these two types of flaws on the mechanical behavior of a rock mass with persistent joints is not yet available. This study focusses on a microcracked rock mass with persistent joints and establishes a mechanical model, accounting for the anisotropy in the rock mass strength and deformability induced by the existence of the joints. Firstly, the compound damage variable from the coupling macroscopic and mesoscopic flaws

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Chiu, J. K., C. C. Li, and O. J. Mengshoel. "Potential applications of deep learning in automatic rock joint trace mapping in a rock mass." IOP Conference Series: Earth and Environmental Science 1124, no. 1 (2023): 012004. http://dx.doi.org/10.1088/1755-1315/1124/1/012004.

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Abstract In blasted rock slopes and underground openings, rock joints are visible in different forms. Rock joints are often exposed as planes confining rock blocks and visible as traces on a well-blasted, smooth rock mass surface. A realistic rock joint model should include both visual forms of joints in a rock mass: i.e., both joint traces and joint planes. Imaged-based 2D semantic segmentation using deep learning via the Convolutional Neural Network (CNN) has shown promising results in extracting joint traces in a rock mass. In 3D analysis, research studies using deep learning have demonstra

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32

Chen, Xin, Zhongliang Feng, and Cheng Cheng. "Numerical Study on Anisotropic Influence of Joint Spacing on Mechanical Behavior of Rock Mass Models under Uniaxial Compression." Energies 13, no. 24 (2020): 6698. http://dx.doi.org/10.3390/en13246698.

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Mechanical properties of rock masses are dominated by the nonlinear response of joints and their arrangement. In this paper, combined influences of joint spacing (s) and joint inclination angle (β) on mechanical behavior of rock mass models with large open joints under uniaxial compression were investigated by PFC modeling. With a large amount of local measurement circles placed along the pre-defined measurement lines (ML), stresses and joint response parameters at different scales (the measurement circles, the MLs and the whole specimen) were defined and calculated. It was found that macrosco

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33

Jia, Shuailong, Zhiliang Wang, Jianguo Wang, Zhitang Lu, and Haochen Wang. "Experimental and theoretical study on the propagation characteristics of stress wave in filled jointed rock mass." PLOS ONE 16, no. 9 (2021): e0253392. http://dx.doi.org/10.1371/journal.pone.0253392.

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This study is to theoretically and experimentally investigate the propagation of stress waves in the filled joint set. The time-domain recursive method is used to derive the propagation equations in the filled joint set, and the filled joints are further simplified into structural planes without joint thickness. The split-Hopkinson rock bar is modified to simulate P wave propagation normally across the parallel filled joints. The relationship among stress-closure curve, joint specific stiffness, transmission coefficient and loading rate is analyzed. The results show that, for the rock mass wit

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34

Hincks, Karen D., and David M. Cruden. "The Rock and Boulder Gardens: a Rock Labyrinth in the Rocky Mountains." Géographie physique et Quaternaire 58, no. 1 (2006): 141–46. http://dx.doi.org/10.7202/013114ar.

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Abstract A rock labyrinth in the Devonian Palliser Formation, which dips at 24° in the direction 224°, occurs in the Front Ranges of the Rocky Mountains, 5 km northeast of the town of Jasper, Alberta. The area that composes the Rock and Boulder Gardens, 200 m by 500 m in size, is visible on aerial photographs of the Maligne Valley. The labyrinth is distinguished by the regular arrangement of large blocks of carbonates that are separated by widely-gaping joint planes. Kinematic freedom for the translation of these blocks was created when erosion of the south slope allowed blocks to slide out of

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35

Wu, Xianlong, Gang Wang, Genxiao Li, et al. "Research on Shear Behavior and Crack Evolution of Symmetrical Discontinuous Rock Joints Based on FEM-CZM." Symmetry 12, no. 8 (2020): 1314. http://dx.doi.org/10.3390/sym12081314.

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Abstract (sommario):

The discontinuous joints are an essential type of natural joints. The normal force, joint persistency, and distribution exert great influences on the shear resistance of the rock joints. By simulating the uniaxial compression experiment and Brazilian test, the material parameters and the basic size standard for meshing were determined. The symmetrical discontinuous joint distribution of three types were established, the cohesive elements were inserted between the solid elements, and the numerical simulation of the shear test was conducted. The effects of joint distribution, joint continuity, a

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36

Wang, Rui Hong, Jian Lin Li, Jing Guo, Yu Zhou Jiang, and Li Dang. "Experimental Study of Mechanical Properties of Rock Mass Containing Intermittent Joints of Prefabricated." Advanced Materials Research 168-170 (December 2010): 2468–72. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.2468.

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Abstract (sommario):

Most of the engineering rock masses contain a variety of different levels of geological tectonic joints and weak planes, which can weaken the rock strength. The rock masses containing joints have completely different mechanical properties with the intact ones. Through loading failure tests on the rock masses containing two intermittent joints of prefabricated of different spacing, the differences between jointed rock mass and intact one were studied. The research shows that: 1. Comparing with the intact rock mass, the stress-strain curve of jointed one has a relatively large fluctuation near t

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37

Cao, Rihong, Hua Dai, Rubing Yao, Hang Lin, and Kaihui Li. "Failure Behaviour of Jointed Rock Masses with 3D Nonpenetrating Joints under Uniaxial Compression: Insights from Discrete Element Method Modelling." Applied Sciences 12, no. 21 (2022): 11027. http://dx.doi.org/10.3390/app122111027.

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Abstract (sommario):

It is well known that joints or fissures have an important effect on the failure mechanism of natural rocks. Previously, many numerical and experimental papers have been carried out to study the strength anisotropy and failure characteristics of jointed rocks. However, few studies have been carried out on the failure mechanism of nonpersistent jointed rock masses with different persistence, especially for nonpersistent joints in three dimensions. In the present study, the failure characteristics of a 3D nonpersistent jointed rock mass with different inclinations (θ) and persistence (K) are stu

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38

Han, Zengqiang, Chuanying Wang, and Hengyin Zhu. "Research on Deep Joints and Lode Extension Based on Digital Borehole Camera Technology." Polish Maritime Research 22, s1 (2015): 10–14. http://dx.doi.org/10.1515/pomr-2015-0025.

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Abstract (sommario):

Abstract Structure characteristics of rock and orebody in deep borehole are obtained by borehole camera technology. By investigating on the joints and fissures in Shapinggou molybdenum mine, the dominant orientation of joint fissure in surrounding rock and orebody were statistically analyzed. Applying the theory of metallogeny and geostatistics, the relationship between joint fissure and lode’s extension direction is explored. The results indicate that joints in the orebody of ZK61borehole have only one dominant orientation SE126° ∠68°, however, the dominant orientations of joints in surroundi

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39

Hu, Xian-qin, and D. M. Cruden. "Rock mass movements across bedding in Kananaskis Country, Alberta." Canadian Geotechnical Journal 29, no. 4 (1992): 675–85. http://dx.doi.org/10.1139/t92-074.

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Abstract (sommario):

Rock mass movements in sedimentary rocks across bedding in Kananaskis Country, Alberta, are controlled by discontinuity orientations and topography. When bedding planes dip at less than 50°, small rock masses can slide along strike joints or fall and slope angles remain unchanged. When bedding surfaces dip at 65–70°, large rock masses topple and then slide or simply slide along sheeting joints or combinations of bedding surfaces and strike joints to reduce slope gradients. Block toppling and sliding models of large slope movements in highly jointed rock masses indicate that toppling mode is mo

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40

Brown, Stephen R., and Christopher H. Scholz. "closure of rock joints." Journal of Geophysical Research 91, B5 (1986): 4939. http://dx.doi.org/10.1029/jb091ib05p04939.

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41

Cheng, Jingyi, Hongwei Zhang, and Zhijun Wan. "Numerical Simulation of Shear Behavior and Permeability Evolution of Rock Joints with Variable Roughness and Infilling Thickness." Geofluids 2018 (December 13, 2018): 1–11. http://dx.doi.org/10.1155/2018/1869458.

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Abstract (sommario):

The mechanical properties and permeability evolution of sand-infilled rock joints during the shear process is an important issue in rock engineering, such as it pertains to hydraulic fractures filled with proppant. Shear can disrupt the preexisting hydraulic and mechanical equilibrium conditions, thus affecting fluid flow. In this study, we simulate the shear behavior of rock joints with variable roughness and sand infilling thickness using the discrete element code PFC2D. Rock joint roughness is evaluated by the joint roughness coefficient (JRC), and sand infilling thickness is evaluated by a

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42

Aliabadian, Zeinab, and Mansour Sharafisafa. "Distinct Element Modeling of the Effect of Joint Persistence on Dynamic Fracturing of Jointed Rock Masses." Applied Mechanics and Materials 553 (May 2014): 445–51. http://dx.doi.org/10.4028/www.scientific.net/amm.553.445.

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Abstract (sommario):

Rock masses consist of intact rock and discontinuities such as faults, joints and bedding planes. The presence of such discontinuities in rock masses dominates the response of jointed rock masses to static and dynamic loading. These structural weak planes seriously hinder and affect the propagation of stress waves in rock mass. The joints parameters such as persistence, orientation, distribution patterns, spacing and filling material have a significant effect on the response of rock masses against wave propagation. In most studies of blast induced wave propagation in jointed rock mass, it is a

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43

Ma, Hai Ping, Li Ge Wang, and Xue Wei Li. "Stability Analysis of Surrounding Rock with Two Groups Parallel Joints Using DDARF Method." Advanced Materials Research 919-921 (April 2014): 735–39. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.735.

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Abstract (sommario):

In order to analyze the stability of surrounding rocks with two groups parallel joints under different angles, a new method, DDARF (discontinuous deformation analysis for rock failure) program was adopted to investigate three cases of uniaxial compression tests of two groups parallel joints sample with the angels 30, 45 and 60. The results show the sample with 30 is least prone to be destroyed and the sample with 60 are most likely to be destroyed. Then DDARF program was also applied to investigate the underground cavern excavation process of two groups parallel joints surrounding rocks with t

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44

Ding, Wantao, Minglei Hou, Lei Chen, et al. "Experimental Study on the Deterioration Rules of Anchoring Performance of Rock Mass under Different Joints Distribution." Advances in Civil Engineering 2019 (October 21, 2019): 1–12. http://dx.doi.org/10.1155/2019/3546052.

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Abstract (sommario):

In order to analyze the influence of damage caused by corrosion on anchoring performance of a rock mass with different joints, the anchored rock mass specimens with different joints distribution were prepared. An electrochemical accelerated corrosion test of specimens was carried out, and the mechanical test of them under different corrosion time was also investigated. The results showed that the pitting corrosion is the main form of the anchor bar corrosion of an anchoring rock mass with different joints, and the shape of the etch pit is reverse semi-ellipse. With the increase of pitting rati

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45

Zhang, Zhi Gang, C. S. Qiao, and Xiao Li. "Study on the Strength of Jointed Rock Mass." Key Engineering Materials 353-358 (September 2007): 381–84. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.381.

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Abstract (sommario):

Based on the structure of the rock mass surrounding a highway tunnel under construction, a new methodology for defining the strength of jointed rock mass is proposed. The laboratory experiments and numerical simulations of rock samples, including both intact rock and rock with a single typical joint, are carried out to ensure that the mechanical parameters of the rock and the joint can be obtained. In addition, the strength of the rock mass surrounding the tunnel, without resorting to the difficult task of sampling and testing of large-scale rock mass, is evaluated by using the proposed method

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46

Liu, Hongyan, and Xiaoping Yuan. "A Compressive Damage Constitutive Model for Rock Mass with a Set of Nonpersistently Closed Joints under Biaxial Conditions." Mathematical Problems in Engineering 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/136971.

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Abstract (sommario):

One of the most problems faced by the practical rock engineering is to evaluate the rock mass strength. Now the existing theoretical evaluation of the mechanical property of jointed rock mass has no satisfactory answer yet because of the great number of variables involved. One of them is the nonpersistent joints which inherently affect the rock mass mechanical behavior. The previous models for rock mass can only reflect the effect of joint geometrical property on its mechanical behavior. Accordingly, this paper presents a new theoretical model to evaluate the mechanical behavior of the rock ma

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47

Huan, Jiu-yang, Ming-ming He, Zhi-qiang Zhang, and Ning Li. "A New Method to Estimate the Joint Roughness Coefficient by Back Calculation of Shear Strength." Advances in Civil Engineering 2019 (July 3, 2019): 1–15. http://dx.doi.org/10.1155/2019/7897529.

Testo completo

Abstract (sommario):

The joint roughness coefficient (JRC) is an important factor affecting the shear properties of rock joints, and its accurate estimation is a challenging task in rock engineering. Existing JRC evaluation approaches such as the empirical comparison method and the statistical parameter method have some unresolved defects. In this study, a new method is proposed for JRC estimation to overcome the deficiencies of existing approaches based on back calculation of shear strength. First, the 10 standard roughness joints are established in numerical rock samples generated by the bonded particle method (

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48

Liu, Jie, Yan-Bin Song, and Yue-Mao Zhao. "Numerical Modeling on Dynamic Characteristics of Jointed Rock Masses Subjected to Repetitive Impact Loading." Shock and Vibration 2021 (December 20, 2021): 1–13. http://dx.doi.org/10.1155/2021/5274602.

Testo completo

Abstract (sommario):

A discrete element method code was used to investigate the damage characteristics of jointed rock masses under repetitive impact loading. The Flat-Joint Contact Model (FJCM) in the two-dimensional particle flow code (PFC2D) was used to calibrate the microparameters that control the macroscopic behavior of the rock. The relationship between macro- and microparameters by a series of uniaxial direct tension and compression numerical tests based on an orthogonal experimental design method was obtained to calibrate the microparameters accurately. Then, the Synthetic Rock Mass (SRM) method that inco

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49

Han, Zeng Qiang, Chuan Ying Wang, and Heng Yin Zhu. "Investigation of Deep Joints and Analysis of Lode Extension Direction in Shapinggou Molybdenum Mine." Applied Mechanics and Materials 638-640 (September 2014): 2151–54. http://dx.doi.org/10.4028/www.scientific.net/amm.638-640.2151.

Testo completo

Abstract (sommario):

By investigating on the joints and fissures in Shapinggou molybdenum mine based on digital borehole camera technology, the dominant orientation of joint fissure in surrounding rock and ore body were statistically analyzed. Applying the theory of metallogeny and geostatistics, the relationship between joint fissure and lode’s extension direction is explored. The results indicate that joints in the ore body of ZK61borehole have only one dominant orientation SE126°∠68°, however, the dominant orientations of joints in surrounding rock were SE118°∠73°, SW225°∠70°and SE122°∠65°, NE79°∠63°. Then a pr

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50

Rahman, Nur Alam Syah, Ganda Marihot Simangunsong, and Irwandi Arif. "Rock strength analysis due to discontinuity and grouting." Indonesian Mining Professionals Journal 2, no. 1 (2020): 29–36. http://dx.doi.org/10.36986/impj.v2i1.20.

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Abstract (sommario):

Instability on rock, one of many factors caused by joint. Decreased of rock strength occurred inline with existence a number of joints. Poor rock have a large number of joints. Therefore rock reinforcement such as grouting can be one of the solution. This research conducted on artificial sample Moldano Tara (dental stone type III). It had been given artificial joints with orientation 60o from axial and frequency 1 till 2. Furthermore, grout material with composition 4C;5W had been injected on joint and cured in 28 days. Triaxial test are done in all samples intact, jointed and grouted and its

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