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随着边坡地质结构、地层岩性和诱发因素的不同,反倾岩体的主控变形破坏模式都会发生改变。金沙江龙蟠边坡岩体主要为反倾向千板岩和砂岩互层状结构,坡脚河床深厚覆盖层构成了边坡的软弱支座。本文运用离散单元法模拟了大型反倾库岸岩体在漫长的地质历史时期中的变形演化过程,并基于反倾岩体变形的时效性观点,引入强度折减法分析边坡在不同阶段的剪切屈服区扩展情况及相应的稳定性状态。结论表明龙蟠边坡变形岩体是重力弯曲蠕变为主导的成因机制,并归纳提出了软基效应和互层效应共同作用下的大规模反倾岩体的累进性剪切破坏模式,俗称“龙蟠模式”。
With the geological structure of the slope, the stratigraphic lithology and the triggering factors, the deformation modes of the main control deformation of the anti-dumping rock mass will change. The Longpan slope rock mass of Jinsha River is mainly interlayered structure of anti-dip tectonism and sandstone, and the deep overburden of slope footbed constitutes the weak support of slope. In this paper, the discrete element method is used to simulate the deformation and evolution of large anti-dumping bank rocks during the long geologic history. According to the time-dependent view of deformation of the anti-dumping rock mass, the strength reduction method is introduced to analyze the shear deformation of the slope at different stages Cut yield zone expansion and the corresponding stability status. The conclusion shows that the deformed rock mass of Longpan slope is dominated by gravity bending creep, and the progressive shear failure mode of large-scale anti-dumping rock mass is summed up. “Long Poon mode ”.