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Relevant bibliographies by topics / Mine subsidences Geology Ground control (Mining) Rock mechanics

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Academic literature on the topic 'Mine subsidences Geology Ground control (Mining) Rock mechanics'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Mine subsidences Geology Ground control (Mining) Rock mechanics"

1

Lan, Tianwei, Chaojun Fan, Jun Han, Hongwei Zhang, and Jiawei Sun. "Controlling Mechanism of Rock Burst by CO2 Fracturing Blasting Based on Rock Burst System." Shock and Vibration 2020 (August 27, 2020): 1–9. http://dx.doi.org/10.1155/2020/8876905.

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Rock burst induced by mining is one of the most serious dynamic disasters in the process of coal mining. The mechanism of a rock burst is similar to that of a natural earthquake. It is difficult to accurately predict the “time, space, and strength” of rock burst, but the possibility of rock burst can be predicted based on the results of microseismic monitoring. In this paper, the rock burst system under the tectonic stress field is established based on the practice of coal mining and the result of mine ground crustal stress measurement. According to the magnitude of microseismic monitoring, the amount of the energy and spatial position of the rock burst are determined. Based on the theory of explosion mechanics, aiming at the prevention and control of rock burst in the coal mine, the technique of liquid CO2 fracturing blasting is put forward. By the experiment of blasting mechanics, the blasting parameters are determined, and the controlling mechanism of rock burst of liquid CO2 fracturing blasting is revealed. The application of liquid CO2 fissure blasting technology in the prevention and control of rock burst in Jixian Coal Mine shows that CO2 fracturing blasting reduces the stress concentration of the rock burst system and transfers energy to the deeper part, and there is no open fire in the blasting. It is a new, safe, and efficient method to prevent and control rock burst, which can be applied widely.

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2

Shi, Junwei, Xiangrui Meng, Jifang Du, Yu Dong, and Ying Wang. "A Pocket Assay Grouting Technology for Rock Burst Control under Huge-Thick Conglomerate." Shock and Vibration 2020 (October 29, 2020): 1–10. http://dx.doi.org/10.1155/2020/8866783.

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As the carrier of force and energy, large-scale breaking or bending of huge-thick conglomerate tends to induce impact ground pressure in stope and tunnel. The stratum movement under huge-thick conglomerate was studied in this paper, which is mainly based on the key stratum theory for ground control. Based on this theory, the huge-thick conglomerate can be regarded as the main key stratum, and stratum movement or the development of grassroots state under huge-thick conglomerate will affect the structure itself, which may induce rock burst in stope and tunnel. The grouting technology is proved to effectively limit the bending settlement of conglomerate, control stress concentration of conglomerate, and improve the structure of the source of rock burst, which is an effective method for the control of huge-thick conglomerate. In this paper, the optimization of grouting filling material ratio is studied by the orthogonal experiments and the results show that the optimization of material ratio is cement: fly ash: gangue 1 : 2.22 : 4.44, concentration 75%. Under such conditions, pumpability and intensity reach the best. Meanwhile, a new technology, called pocket assay grouting technology, is put forward in this paper. It can prevent slurry leakage, protect the environment, and improve the efficiency of slip casting. The application of this technology in Huafeng mine shows that it not only realizes the safe, efficient, and green of coal mine but also provides technical support to control occurrence of rock burst induced by the movement of the huge-thick conglomerate in deep mining.

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3

Feng, Guorui, Pengfei Wang, Yoginder P. Chugh, Jingli Zhao, Zhiqiang Wang, and Zhipeng Zhang. "A Coal Burst Mitigation Strategy for Tailgate during Deep Mining of Inclined Longwall Top Coal Caving Panels at Huafeng Coal Mine." Shock and Vibration 2018 (May 29, 2018): 1–18. http://dx.doi.org/10.1155/2018/5929785.

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A coal burst mitigation strategy for tailgate in mining of deep inclined longwall panels with top coal caving at Huafeng Coal Mine is presented in this paper. Field data showed that coal bursts, rib sloughing or slabbing, large convergence, and so forth frequently occurred within the tailgate entries during development and panel retreating employing standard longwall top coal caving (LTCC) layout which resulted in fatal injuries and tremendous profit loss. The contributing factors leading to coal bursts were analyzed. Laboratory tests, in situ measurement, and field observation demonstrate that the intrinsic bursting proneness of the coal seam and immediate roof stratum, deep cover, overlying ultrathick (500–800 m) conglomerate strata, faults, and, most importantly, improper panel layout led to coal bursts. By employing a new strategy, that is, longwall mining with split-level gateroads (LMSG), gateroads on either end of a LMSG panel are located at different levels within a coal seam, adjacent LMSG panels overlap end to end, and the tailgate of the adjacent new LMSG panel can be located below the headgate entry of the previous LMSG panel or may be offset horizontally with respect to it. Numerical modeling was carried out to investigate the stress distribution and yield zone development within surrounding rock mass which was validated by field investigation. The results indicate that standard LTCC system gave rise to high ground pressure around tailgate entries next to the gob, while LMSG tailgate entry below the gob edge was in a destressed environment. Therefore, coal bursts are significantly mitigated. Field practice of LMSG at Huafeng Coal Mine demonstrates how the new strategy effectively dealt with coal burst problems in mining of deep inclined longwall panels with a reduced incidence of ground control problems. The new strategy can potentially be applied in similar settings.

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4

Bu, Qingwei, Min Tu, and Baojie Fu. "Research on the Redistribution Law of Lateral Mining Stress and the Bearing Characteristics of Section Coal Pillar in Extra-Thick Fully Mechanized Top-Coal Caving Mining." Shock and Vibration 2021 (September 2, 2021): 1–17. http://dx.doi.org/10.1155/2021/4355977.

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Due to the change of ground stress environment caused by underground coal mining, the intense lateral mining stress concentration is formed around the stope; so section coal pillar is generally set up to bear the mining pressure, but the different sizes of coal pillars have obvious influence on the bearing capacity of those pillars and the characteristics of mining pressure. Mastering the mechanism characteristics by which coal pillars bearing capacity and mining stress distribution is crucial to identify the reasonable coal pillar size and give full play to the bearing role of section coal pillar, given their importance for the safety and bearing stability of engineering rock mass in underground coal mining. Therefore, the bearing characteristics of section coal pillar and the redistribution of mining stress are achieved with a mechanical model analysis on the basis of the analysis of coal pillar bearing and mining influence characteristics. Moreover, applying the elastic-plastic mechanics theory revealed the mechanical equations of the effective bearing size of coal pillar and redistribution of mining stress in longwall face. Combined with the analysis of a specific engineering example, the research results are as follows. During a roadway excavation, the continuous mining stress transfer occurs “stress redistribution” and the mechanical failure of bearing coal pillar consists of lateral mining and roadway side failures. The bearing coal pillar has two critical dimensions (i.e., the critical dimension W e of the self-bearing stability coal pillar and the critical dimension W p of failure through the coal pillar). The mechanical state of the lateral mining stress redistribution and bearing coal pillar is divided into the three situations: ① when the width of coal pillar W < W p , only one stress concentration area exists, the bearing capacity of the coal pillar is invalid at this stage, and the lateral mining stress concentration transfers to the roadway solid coal side; ② when the width of the coal pillar W e ≥ W ≥ W p , two stress concentration areas appear at this stage, and the coal pillar is in the critical state of self-bearing stability; ③ when the width of the coal pillar W > W e , three stress concentration areas are present, and the coal pillar at this stage is in a self-bearing stable state. Among all these factors, only the size of coal pillar is completely controllable, so the aspects of safe bearing and reserved size design of coal pillar, after estimating the critical size of coal pillar, the coal pillar size design is carried out according to the mine pressure control needs of mining engineering, and the cohesion, internal friction angle, interlayer friction coefficient, and coal seam mining height are improved by artificial technology, so as to realize the resource safe and efficient mining of all kinds of coal seam mining conditions; in the calculation of wide coal pillar size, the advance mining stress concentration at the end of the self-working face should be taken as the mining load condition, and the reserved size meets the condition of W > W e , thereby ensuring the stable bearing of the wide coal pillar despite the advanced mining stress concentration during the self-working face mining; in the calculation of narrow coal pillar size, the lateral mining stress concentration before mining should be taken as the mining load condition and the reserved size meets the condition W < W p , thereby realizing the effective transfer of mining stress concentration to the roadway solid coal side.

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5

Zhang, Dingding, Yanyan Duan, Wengang Du, and Jing Chai. "Experimental Study on Physical Similar Model of Fault Activation Law Based on Distributed Optical Fiber Monitoring." Shock and Vibration 2021 (September 25, 2021): 1–11. http://dx.doi.org/10.1155/2021/4846977.

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The impact ground pressure in coal mining is closely related to the fault structure, and the fault activation pattern is different when the working face advances along the upper and lower plates of the fault, respectively. In this paper, the F16 positive fault in the southern part of Yima coalfield is used as a prototype to carry out the physical similar model test simulating the process of the working face advancing from the upper and lower plates of the fault, and PPP-BOTDA optical fiber sensing technique is used to study the overburden deformation law and fault activation law when the working face is located in the upper and lower plates of the fault, respectively. The study shows that the key stratum breakage is closely related to the fault movement, and the shear stress concentration range occurs within the key stratum. The additional shear stress concentration at the fault surface caused by the working face advancing in the lower plate is much larger than that at the upper plate, which is the reason for the serious fault destabilization phenomenon at the lower plate. The upper rock layer on the fault face is affected by the mining action of the working face before the lower one, and the working face is affected by the fault in a larger range when advances in the lower plate than that in the upper plate, and the risk of fault activation instability occurs earlier when the working face advances in the lower plate than that in the upper plate. The distributed optical fiber sensing technology is used to verify the basic conclusions that the impact of the working face advancing from the lower plate is much greater than that from the upper plate, which is more likely to cause fault activation. The preferential placement of the working face in the upper plate in the fault area will be beneficial to mine pressure control. The results of the study provide an experimental basis for the application of distributed optical fiber sensing technology to the study of fault activation law.

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Dissertations / Theses on the topic "Mine subsidences Geology Ground control (Mining) Rock mechanics"

1

Keilich, Walter. "Numerical modelling of mining subsidence, upsidence and valley closure using UDEC." School of Civil, Mining & Environmental Engineering - Faculty of Engineering, 2009. http://ro.uow.edu.au/theses/862.

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Ground subsidence due to mining has been the subject of intensive research for several decades, and it remains to be an important topic confronting the mining industry today. In the Southern Coalfield of New South Wales, Australia, there is particular concern about subsidence impacts on incised river valleys – valley closure, upsidence, and the resulting localised loss of surface water under low flow conditions. Most of the reported cases have occurred when the river valley is directly undermined. More importantly, there are a number of cases where closure and upsidence have been reported above unmined coal. These latter events are especially significant as they influence decisions regarding stand-off distances and hence mine layouts and reserve recovery.The deformation of a valley indicates the onset of locally compressive stress conditions concentrated at the base of the valley. Compressive conditions are anticipated when the surface deforms in a sagging mode, for example directly above the longwall extraction; but they are not expected when the surface deforms in a hogging mode at the edge of the extraction as that area is typically in tension. To date, explanations for valley closure under the hogging mode have considered undefined compressive stress redistributions in the horizontal plane, or lateral block movements and displacement along discontinuities generated in the sagging mode. This research is investigating the possibilities of the block movement model and its role in generating compressive stresses at the base of valleys, in the tensile portion of the subsidence profile. The numerical modelling in this research project has demonstrated that the block movement proposal is feasible provided that the curvatures developed are sufficient to allow lateral block movement. Valley closure and the onset of valley base yield are able to be quantified with the possibility of using analytical solutions. To achieve this, a methodology of subsidence prediction using the Distinct Element code UDEC has been developed as an alternative for subsidence modelling and prediction for isolated longwall panels. The numerical models have been validated by comparison with empirical results, observed caving behaviour and analytical solutions, all of which are in good agreement. The techniques developed in the subsidence prediction UDEC models have then been used to develop the conceptual block movement model. The outcomes of this research have vast implications. Firstly, it is shown that valley closure and upsidence is primarily a function of ground curvature. Since the magnitude of curvature is directly related to the magnitude of vertical subsidence there is an opportunity to consider changes in the mine layout as a strategy to reduce valley closure. Secondly, with further research there is the possibility that mining companies can assess potential damage to river valleys based on how close longwall panels approach the river valley in question. This has the added advantage of optimising the required stand off distances to river valley and increasing coal recovery.

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2

Becker, James B. "A Combined Field, Laboratory, and Numerical Study of Cutter Roof Failure inCarroll Hollow Mine, Carroll County, Ohio." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1366382367.

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Books on the topic "Mine subsidences Geology Ground control (Mining) Rock mechanics"

1

Chugh, Yoginder P. Laboratory characterization of immediate floor strata associated with coal seams in Illinois. Champaign, Ill: Illinois State Geological Survey, 1986.

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2

Chugh, Yoginder P. Laboratory characterization of immediate floor strata associated with coal seams in Illinois. Champaign, Ill: Illinois State Geological Survey, 1986.

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3

Chugh, Yoginder P. In situ strength characteristics of coal mine floor strata in Illinois. Champaign, Ill. (615 E. Peabody Dr., Champaign 61820): Illinois Mine Subsidence Research Program, 1988.

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4

Chugh, Yoginder P. In situ strength characteristics of coal mine floor strata in Illinois. Champaign, IL: Illinois State Geological Survey, 1988.

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5

Chugh, Yoginder P. In situ strength characteristics of coal mine floor strata in Illinois. Champaign, Ill: Illinois State Geological Survey, 1987.

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6

Issledovanii͡a︡ sdvizhenii͡a︡ gornykh porod i gidrogeomekhanicheskikh prot͡s︡essov v massivakh slozhnoĭ struktury pri razrabotke ugolʹnykh mestorozhdeniĭ: Sbornik nauchnykh trudov. S.-Peterburg: Nauchno-issl. in-t gornoĭ geomekhaniki i marksheĭderskogo dela, 1992.

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7

C, Bétournay M., Canada Centre for Mineral and Energy Technology., Canadian Institute of Mining and Metallurgy., and Ontario. Ministry of Northern Development and Mines., eds. Surface crown pillar evaluation for active and abandoned metal mines: Proceedings of the international conference : Senator Hotel, Timmins, Ontario, Canada, Nov. 15-17, 1989. [Canada]: Energy, Mines, and Resources Canada, 1989.

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8

Surface crown pillar evaluation for active and abandoned metal mines: Proceedings of the international conference = évaluation de pliers de surface pour les mines de métaux actives et abandonnées ; compte rendu de la conférence internationale ; Senator Hotel, Timmins, Ontario, Canada, Nov. 15-17, 1989 ; sponsored by CANMET, CIM, Ministry of Northern Development and Mines. Ottawa: Ministry of Supply and Services, Canada, 1989.

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9

Surface crown pillar evaluation for active and abandoned metal mines: Proceedings of the international conference : Senator Hotel, Timmins, Ontario, Canada, Nov. 15-17, 1989 (SP). Canadian Govt. Pub. Center [distributor], 1989.

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10

Ontario. Ministry of Northern Development and Mines., Ontario. Ministère du développement du Nord et des mines., Canada Centre for Mineral and Energy Technology., Canadian Institute of Mining and Metallurgy., Centre canadien de la technologie des minéraux et de l'énergie., and Institut canadien des mines et de la métallurgie., eds. Surface crown pillar evaluation for active and abandoned metal mines : proceedings of the international conference : Senator Hotel, Timmins, Ontario, Canada, Nov. 15-17, 1989 =: Évaluation de piliers de surface pour les mines de métaux actives et abandonnées : Senator Hotel, Timmins, Ontario, Canada, Nov. 15-17, 1989. Ottawa, Ont: Canada Centre for Mineral and Energy Technology = Centre canadien de la technologie des minéraux et de l'énergie, 1989.

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