Abstract
The 6163 haulage roadway in the Qidong coal mine passes through a fault zone, which causes severe deformation in the surrounding rock, requiring repeated roadway repairs. Based on geological features in the fault area, we analyze the factors affecting roadway deformation and failure and propose the concept of roadway sensitive to stress disturbance (RSSD). We investigate the deformation and failure mechanism of the surrounding rocks of RSSD using field monitoring, theoretical analysis, and numerical simulation. The deformation of the surrounding rocks involves dilatation of shallow rocks and separation of deep rocks. Horizontal and longitudinal fissures evolve to bed separation and fracture zones; alternatively, fissures can evolve into fracture zones with new fissures extending to deeper rock. The fault affects the stress field of the surrounding rock to ~27 m radius. Its maximum impact is on the vertical stress of the rib rock mass and its minimum impact is on the vertical stress of the floor rock mass. Based on our results, we propose a zonal support system for a roadway passing through a fault. Engineering practice shows that the deformation of the surrounding rocks of the roadway can be effectively controlled to ensure normal and safe production in the mine.
Highlights
Geological faults can seriously affect coal mining activities
Shen et al [9] deem that the fault exerts a significant influence on the adjacent stress field, whose stress intensity and direction are closely related to the scale of the fault, the medium of the fault, the geometrical morphology of the fault, and the boundary conditions
Taking the 6163 haulage roadway in the Qidong coal mine as a case study, we investigate the deformation and failure mechanism of the roadway that passes through the fault structure zone
Summary
Geological faults can seriously affect coal mining activities. An accurate analysis of fault structure is important for the layout of the mining district and for roadway support design [1, 2]. The reactivation of joints, fissures, and faults existing in the strata by mining activities inevitably undermines the stability of the roof strata. These issues are discussed by many scholars. Islam and Shinjo studied how the mining-activated fault threatens the roadway stability and the mine safety [7]. Previous studies examined the influences of a normal fault on the physical and mechanical properties of the coal mass and on ground pressure behavior [8]. Taking the 6163 haulage roadway in the Qidong coal mine as a case study, we investigate the deformation and failure mechanism of the roadway that passes through the fault structure zone. We propose a zonal support technology for haulage roadways
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