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  2023, Vol. 42 Issue (S2): 4109-4120    DOI: 10.13722/j.cnki.jrme.2022.1135
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Risk assessment of roof fault activation induced by mining stress deflection in mining roadway
LI Ji1,2,ZHANG Rongguang1,2,YU Yang3,YU Jiandong3,XIE Panshi1,2,LANG Ding1,2
(1. School of Energy,Xi?an University of Science and Technology,Xi?an,Shaanxi 710054,China;2. Key Laboratory of Western Mine and Hazard Prevention,Ministry of Education,Xi?an University of Science and Technology,Xi?an,Shaanxi 710054,China;
3. Shaanxi Ruineng Coal Industry Limited Liability Company,Yan?an,Shaanxi 727307,China)
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Abstract  Aiming at the problem that the roof fault of the mining roadway is prone to activation and roof deformation under the influence of mining. With the background of the roof crossing fault fracture zone of return laneway in 201 working face of Ruineng Coal Mine. Theoretical analysis, numerical simulation and field measurement were used in this study. Which contains the influence of principal stress deflection induced by mining activities on the risk of fault activation,the characteristics of the mining stress deflection in front of working face,the principal stress deflection characteristics of the roadway roof fault plane and the roof stability. The results showed that the mining stress deflection caused the transition from the tangent state to the secant state of the stress Mohr circle of the fault plane and the rock strength curve,which increased the risk of slip instability of the fault plane. The risk evaluation coefficient k of fault plane activation covering the ratio of normal stress to shear stress was obtained by theoretical derivation. The influence range of advance disturbance of working face was 25 m,the principal stress deflected obviously in the range of 2 m in front of the working face and 4m on the side of the coal wall of the roadway,and the deflection angle was greater than 60°. The principal stress deflection of shallow fault plane within 2 m of roadway roof was significantly affected by the mining disturbance of working face,and the significance decreased with the increase of distance from working face. The shallow part(k>1) of the overlying roof of the roadway along the fault dip belonged to the fault activation risk area,and the deep part  (k<1) belonged to the stable area. The risk of fault activation risk zone decreased exponentially with the increase of distance from working face along fault strike. Within 5 m in front of the working face,it belonged to the high risk area. Within 5–20 m,it belonged to the general risk area. Within 20– 25 m,it belonged to the low risk area. The risk of fault activation in the mining stage of working face had a significant influence on the deformation of roadway roof. With the increase of distance from working face,roof deformation in high risk area>general risk area>low risk area. Based on the risk of fault activation and the stability of roadway roof,the reinforcement support scheme during mining was given.
Key wordsmining engineering      mining disturbance      deflection of principal stress      fault activation      plastic zone      roof stability     
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Articles by authors
LI Ji1
2
ZHANG Rongguang1
2
YU Yang3
YU Jiandong3
XIE Panshi1
2
LANG Ding1
2
Cite this article:   
LI Ji1,2,ZHANG Rongguang1, et al. Risk assessment of roof fault activation induced by mining stress deflection in mining roadway[J]. , 2023, 42(S2): 4109-4120.
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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1135      OR      http://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS2/4109
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