Deformation and stress distribution laws of surrounding rock in gateways under multiple fault conditions
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摘要: 为了了解断层带采场巷道围岩变形与应力分布规律,通过理论推导“断层带采场巷道回采阶段理论力学模型”,结合数值模拟研究了断层附近采场巷道在工作面推进过程中的应力、塑性区分布,以及巷道顶部和两侧围岩变形规律。结果显示:断层带采场巷道围岩变形及应力分布规律与断层位置有关;巷道围岩受采动影响,最大主应力逐渐增大且集中于断层处,塑性区范围扩大,范围为5 m左右,在左肩角发生剪拉破坏;巷道顶板松动影响范围为4 m,距离巷道表面越远,下沉量越小;巷道两帮围岩越接近巷道表面,位移越大;断层上盘围岩在断层影响下,垂直位移增大,水平位移几乎为0。Abstract: To understand the deformation and stress distribution patterns of surrounding rocks in fault zone stope roadways, the “ theoretical mechanics model for the excavation stage of fault zone stope roadways ” was derived through theoretical calculations. Combined with numerical simulations,the stress and plastic zone distributions near the fault during the working face advancement process were studied, as well as the deformation patterns of the surrounding rocks at the top and sides of the roadway. The results indicate that the deformation and stress distribution patterns of the surrounding rocks in fault zone stope roadways are related to the fault location; the surrounding rocks of the roadway are affected by mining activities, with the maximum principal stress gradually increases and concentrates at the fault,the range of the plastic zone expanding to about 5 m, and shear-tensile failure occurring at the left shoulder angle;the loosening influence range of the roadway roof is 4 m,with the subsidence amount decreasing further from the roadway surface,the closer the surrounding rocks on both sides of the roadway are to the surface, the greater the displacement; under the influence of the fault, the vertical displacement of the hanging wall surrounding rocks increases,while the horizontal displacement is almost zero.
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Keywords:
- fault /
- mining roadway /
- numerical simulation /
- surrounding rock deformation /
- stress distribution
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