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为揭示软弱基底排土场边坡变形破坏模式,以某露天铁矿废弃排土场为研究对象,对基底黏土进行三轴剪切和原位直剪力学测试,获取黏土的抗剪强度参数区间.建立排土场边坡的三维数值模拟计算模型,基于强度折减技术逐渐折减黏土强度参数,得到边坡处于极限平衡状态时的强度参数即为黏土的合理抗剪强度参数.三维反演得到排土场边坡的变形破坏演化过程.结果表明,基底软弱层和排土场内部扩展裂缝组合形成“Y”型滑面,滑面将滑体分割为上部主动楔体和下部被动楔体,形成双楔体滑动破坏.模拟结果反映了边坡滑动的三维效应且和现场调查的排土场实际滑坡情况相符.
In order to reveal the deformation and failure mode of slopes of soft soil dump, a three-axis shear and in-situ direct shear test of clay was conducted with the abandoned dump of an open-pit iron mine as the research object. The shear strength parameters of clay Based on the strength reduction technique, the clay strength parameter is gradually reduced, and the strength parameter of the slope in the state of ultimate equilibrium is obtained as the reasonable shear strength parameter of the clay. The 3D inversion The results show that the “Y” type slip surface is formed by the combination of the extended weak fractures in the basement and the earthwork, and the slip surface divides the slide body into the upper active wedge and the lower passive wedge , Resulting in double wedge sliding failure.The simulation results reflect the three-dimensional effect of slope sliding and are consistent with the actual landslip conditions of the dump site surveyed.