顺倾基底高段排土场边坡失稳模式与控制对策

Instability Mode and Control Measures of High Slope in Waste Dump with Bedding Basement

为了解决顺倾基底高段排土场边坡沿物料与基底接触面发生顺层滑动的问题,以安太堡露天矿背斜影响区内排搭路边坡为例,建立工程地质模型,采用数值模拟与极限平衡分析相结合的方法,研究了运输干道外侧高边坡剪应变增量、塑性区分布、位移特征及边坡稳定性。通过研究,探明了顺倾基底高段排土场边坡变形失稳模式为"圆弧-顺层"组合滑动,提出了基于反向排土的顺倾基底排土场高边坡稳定控制方法,通过分阶段排土施工,将运输干道外侧边坡高度由75 m减小至30 m,在保证边坡安全的同时有效缩短了内排运距。

To solve the problem of bedding sliding along the contact surface between the material and the base of high slope in the waste dump with bedding basement,the dump slope of anticlinal tectonic influence area about Antaibao open-pit mine is taken as the example,and the engineering geological model is established.The combination method of numerical simulation and limit equilibrium analysis is used to study the shear strain increment,plastic zone distribution and displacement characteristics and slope stability of the lateral high slope about the main transport road.Through the research,it is proved that the deformation and instability mode of high slope in the waste dump with bedding basement is the combined sliding of"arc-bedding",the stability control method of high slope in the waste dump with bedding basement based on the reverse soil discharge is proposed.The lateral slope height of the main transport road reduces from 75 m to 30 m by the stage drainage construction,which can guarantee the safety of the slope and shorten the inner discharge distance effectively.