重复采动对顺层岩质斜坡变形破坏的数值模拟研究
Study on deformation and failure response characteristics of bedding rock slope induced by repeated mining based on numerical simulation method
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摘要: 煤层开采过程中顺层岩质斜坡易发生滑坡，且这类滑坡往往规模大，危害性大；以UDEC离散元法为基础，研究地下煤层重复开采对顺层岩质斜坡的影响。研究结果表明：采动影响的下沉量随埋深减少依次递减，岩层在受采动影响后的变形为非连续性变形，与单层开采相比，重复采动会导致斜坡在水平方向的移动变形显著增大；重复采动导致斜坡发育新的裂缝和裂缝群，更容易导致软弱结构层发生破坏，坡体稳定性进一步降低；单层采动时的“变形积累-裂缝产生-扩展-闭合”动态发育过程在重复采动时会演变成“变形积累-裂缝发育扩展-发育稳定”动态发育过程。Abstract: Underground mining induces the movement, deformation and failure of bedding rock slope in mountainous areas, which develops into geological disasters such as landslides and collapses. In this paper, based on UDEC discrete element method, this paper studies the influence of repeated mining of underground coal seam on the location of bedding rock slope. The results showed that: the subsidence affected by mining decreases with the decrease of buried depth, and the deformation of strata after mining is discontinuous. Compared with single-layer mining, repeated mining will lead to a significant increase in the horizontal deformation of slope. Repeated mining leads to the development of new fractures and fracture groups in the slope, which is more likely to lead to the destruction of the weak structural layer and further reduce the stability of the slope. The dynamic development process of “deformation accumulation-generation-expansion-closure” during single-layer mining will evolve into a dynamic development process of “deformation accumulation-development and expansion-development and stability” during repeated mining.
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