论文部分内容阅读
以重庆武隆鸡冠岭陡倾层状岩质斜坡滑动为例,采用FLAC3D模拟分析地下采空诱发陡倾层状岩质斜坡“弯曲变形→层间错动→采矿加速倾倒变形→下伏岩体阻滑→下伏岩体剪切破坏→整体失稳”的渐进失稳过程,认为鸡冠岭山体滑动是一类层状岩体的倾倒–滑移失稳的复合破坏模式。模拟结果表明:(1)陡倾临空的斜坡在长期重力作用下,坡体沿山梁方向发生蠕滑变形,坡体逐渐产生拉裂缝;同时由于该斜坡位于背斜核部附近,应力集中导致上覆层状岩体呈现出弯曲变形的特征;(2)长期岩溶作用加速坡体裂缝的发育与扩张;(3)斜坡下部煤层开采导致鸡冠岭山梁发生应力发生重分布,上覆层状岩体逐渐发生层面分离,层状岩体下部产生裂缝,岩体强度逐渐降低;(4)当斜坡下部煤层逐渐采空后,上覆层状岩体变形急剧增大,发生倾倒破坏,挤压矿层下伏稳定岩体,发生剪切滑移,最终从临空处剪出形成高速碎屑流。因此,对于西南灰岩褶皱山区,认识长期地下采空对层状山体的扰动作用,对大型灰岩山体防灾减灾与风险区划具有重要的现实意义。
Taking the slipping and tilting of Jiguanshling, Wulungling, Chongqing as an example, the FLAC3D simulation was used to simulate the analysis of the steeply layered rocky slope “bending deformation → interlaminar dislocation → mining acceleration and dumping deformation → underburden Body slippery → the next rock shear failure → overall instability ”of the gradual destabilization process, that the Jiguan ridge sliding body is a layered rock mass collapse - slip failure of the composite failure mode. The simulation results show that: (1) Under long-term gravity, the slope creeps along the mountain beam and the slope gradually cracks; and as the slope is located near the core of the anticline, stress concentration causes (2) Long-term karstification accelerates the development and expansion of slope cracks; (3) The mining of coal seam in the lower part of the slope leads to the stress redistribution in Jiguanling ridge, overlying stratigraphic rocks (4) When the coal seam in the lower part of the slope gradually empties, the deformation of the overburden rock mass increases sharply and the dumping failure occurs. The crushed ore layer The underlying stable rock, shear slip occurs, and eventually cut off from the airport to form a high-speed debris flow. Therefore, recognizing the disturbing action of long-term underground mined-out on stratiform mountains in the southwestern limestone fold mountain area is of great practical significance for disaster prevention and reduction and risk zoning of large limestone mountains.