露天矿顺层软岩边坡开挖变形特征与参数优化研究

针对露天矿含水软岩边坡在成坡后出现的蠕滑变形与顺层失稳问题，为确定极限稳定边坡角，以东明露天矿南端帮边坡为研究对象，在工程地质勘查与力学实验的基础上，采用有限差分计算程序FLAC3D研究了地下水作用下顺层软岩边坡的变形破坏特征，然后采用极限平衡法对比分析了地下水对边坡稳定性的影响程度，最后结合有限元强度折减法对边坡角进行优化设计。研究结果表明，地下水对东明露天矿南帮边坡稳定影响程度明显，考虑地下水作用时软弱岩层面位置的稳定系数比正常情况下低20.73%，综合考虑以上因素，最终确定南帮极限稳定边坡角为22°。基于有限元法和极限平衡法相结合的边坡参数优化设计方法，能够科学可靠地确定极限稳定边坡角，对于类似软岩矿山边坡角优化具有借鉴意义。

Study on DeformationCharacteristics of Slope Excavation and Parameter Optimization of Soft Rock and Bedding Slope in Open-pite

Aiming at the creep deformation and bedding instability of the water-bearing soft rock slope in open pit mine, in order to determine the reasonable slope angle, taking the southern slope of the Dongming open-pit mine as the research object, on the basis of engineering geological prospecting and mechanical experiment ,the deformation and failure characteristics of bedding soft rock slope under the action of groundwater are studied by using FLAC3D,then the limit equilibrium method is used to compare and analyze the influence degree of groundwater on slope stability, finally, the slope Angle is optimized by the finite element strength reduction method. The results show that, the influence of groundwater on the stability of the southern slope of Dongming open-pit mine is obvious,the stability coefficient of the position of the soft rock surface is 20.73% lower than that under normal conditions, taking the above factors into consideration, the ultimate stability Angle of the south slope is determined to be 22°.The optimization design method of slope parameters on the basis of limit equilibrium analysis and finite element strength reduction could scientific and reliable determine the limit stable slope angle .