Mechanism and Prevention and Control of Mine Earthquake in Thick and Hard Rock Strata considering the Horizontal Stress Evolution of Stope

Zhang, Ming; Hu, Xin; Huang, Hongtao; Chen, Guangyao; Gao, Shan; Liu, Chao; Tian, Lihua

doi:10.1155/2021/6680928

Cited by 9 publications

(4 citation statements)

References 20 publications

(21 reference statements)

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“…An analysis of the distribution characteristics of the primary key stratum in the coal mine revealed the bow-shaped structural characteristics of the overlying thick primary key stratum [11]. The mechanism, prevention measures, and control methods for earthquake disasters typically occurring in mines with thick and hard rock strata were investigated [12]. A simplified mechanical model for the analysis of the dynamic destabilization of the overlying strata during underground mining was constructed [13].…”

Section: Introductionmentioning

confidence: 99%

Influence of Key Strata on the Evolution Law of Mining-Induced Stress in the Working Face under Deep and Large-Scale Mining

et al. 2023

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When there are multiple key strata in the overburden of a deep coal seam and the surface subsidence coefficient after mining is small, this indicates that the overlying key strata fail to break completely after mining. On this occasion, stress is easily concentrated in the working face, which in turn leads to the occurrence of dynamic disasters such as rock bursts. This study adopted a comprehensive analysis method of field monitoring and numerical simulations to explore the influence of the key stratum on the evolution law of mining-induced stress in the working face. A distributed optical fiber sensor (DOFS) and a surface subsidence GNSS monitoring system were arranged inside and at the mouth of the ground observation borehole, respectively. According to the monitoring results of strain obtained from the DOFS, the height of the broken stratum inside the overlying strata was obtained and according to the monitoring results of surface subsidence, the surface subsidence coefficient was proven to be less than 0.1, indicating that the high key stratum is not broken completely, but enters a state of bending subsidence instead. In order to reveal the influence of the key stratum on the mining-induced stress of the working face, two 3DEC numerical models with and without the key stratum were established for a comparative analysis. As the numerical simulation results show, when there are multiple key strata in the overburden, the stress influence range and the stress concentration coefficient of the coal seam after mining are relatively large. The study revealed the working mechanism of rock burst accidents after large-scale mining and predicted the potential area with a rock burst risk after mining of the working face, which was verified by field investigations. The research results are of great guiding significance for the identification of the working mechanism of rock bursts in deep mining condition and for their prevention and control.

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Section: Introductionmentioning

confidence: 99%

Influence of Key Strata on the Evolution Law of Mining-Induced Stress in the Working Face under Deep and Large-Scale Mining

et al. 2023

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“…Mine tremors are frequently induced by the failure of the THRS and the migration of the overburden structure under strong mining. To prevent or avoid tremors and other dynamic hazards, the lows of overburden structure evolution and stress field change are investigated, and effective control techniques are proposed, e.g., deephole blasting (Wang and Tu, 2013;Xu and Fu, 2019;Zhang and Hu, 2021a;Zou and Wu, 2022), hydraulic fracturing (He and Dou, 2012;Zou and Jiao, 2021), and material filling in the goaf .…”

Section: Introductionmentioning

confidence: 99%

Evolution characteristics of overburden structure and stress in strong mining of the deep coal seam: a case study

Zou,

Wang,

Bai

et al. 2023

Front. Earth Sci.

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As coal resources are gradually being extracted at depth, the overlying strata movement behavior and stress environment become complex and violent, leading to the frequent triggering of strong dynamic hazards. To promote the productivity and effectiveness of mining activities, this paper investigated the evolution characteristics of overburden structure and stress in deep mining by using theoretical analysis, on-site monitoring, and numerical simulation. Based on key strata theory, key layers were determined, and how their movement states have a controlling effect on surface subsidence was analyzed. The evolution process of the overburden spatial structure in deep mining was revealed, which was consistent with the “O-X” type structure. The surrounding rock stress at the working face has gone through three stages, violent change, slow increase, and fluctuant increase, and strong strata behaviors appear because of the fracture and collapse of key layers. The goaf will have a significant effect on the structure, stress, and deformation of the overlying rock, which results in a larger deformation of the surrounding rock within the vicinity. The narrow coal pillar fails to maintain the stability of the overburden structure when the stress exceeds the bearing capacity. The deformation law of the surrounding rock at the roadway was studied, concluding that the existence of the goaf leads to a further increase in deformation.

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“…Thick and hard rock layers exist in mining areas in coal producing provinces of China such as Shandong, Henan, Anhui and Inner Mongolia. [8][9][10] Underground mining results in thick and hard rock layer fractures to induce mine quakes, and the ground vibration damage has gradually become the main obstacle in the sustainable development of the coal mining industry. Mine quakes with energy greater than 10 [5] have occurred in typical thick and hard rock mines such as the Yima Qianqiu Coal Mine, Xinwen Huafeng Coal Mine and Yanzhou Nantun Coal Mine in China.…”

Section: Introductionmentioning

confidence: 99%

Prediction Method for the Ground Vibration Damage Boundary of Thick and Hard Rock Layer Fracture Type Mine Quakes

Zhang

et al. 2022

Geofluids

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In this study, based on the example of the ground vibration damage response of a thick and hard rock layer fracture type mine quake, and by applying the theories of mine pressure, rock mechanics and vibration energy principle, the concept of “vibration damage boundary” of mine quake ground, which uses particle vibration velocity to evaluate the vibration damage, is proposed. In addition, the quantitative prediction method of the ground vibration damage boundary is preliminarily established. The research results reveal that the elastic deformation of the fixed support end of the thick and hard rock layer structure in the stope is the main energy source for the formation of mine quakes, and that the particle vibration velocity caused by the propagation of focal energy to the ground can reasonably reflect the response degree of vibration damage. The proposed prediction method considers the “instantaneous” motion characteristics of mining thick and hard rock layer and the dynamic load effect of “mine quakes.” The method can deepen our understanding of mining ground damage prediction, and increase the reliability of ground damage boundary prediction. Finally, the results are used to predict the ground vibration damage boundary of limestone primary fracture in the longwall 16101 face of the Fuping Coal Mine.

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Mechanism and Prevention and Control of Mine Earthquake in Thick and Hard Rock Strata considering the Horizontal Stress Evolution of Stope

Cited by 9 publications

References 20 publications

Influence of Key Strata on the Evolution Law of Mining-Induced Stress in the Working Face under Deep and Large-Scale Mining

Influence of Key Strata on the Evolution Law of Mining-Induced Stress in the Working Face under Deep and Large-Scale Mining

Evolution characteristics of overburden structure and stress in strong mining of the deep coal seam: a case study

Prediction Method for the Ground Vibration Damage Boundary of Thick and Hard Rock Layer Fracture Type Mine Quakes

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