中间湾矿区边坡稳定性研究

Research of Slope Stability in the Middle Bay Mine

以黄冈亚东水泥有限公司的中间湾砂页岩矿区露天边坡为工程背景,借助Rocscience Slid二维边坡计算软件,选用圆弧滑动面Bishop法、Janbu法确定其边坡安全系数,判断边坡稳定性程度。研究发现在假定边坡岩石力学参数条件下,平常状态下的最终边坡安全系数可满足边坡工程安全Ⅲ级荷载组合Ⅰ(1.15~1.10)的要求。而地震模式下设计的最终边坡安全系数满足边坡工程安全Ⅲ级荷载组合Ⅱ(1.10~1.05)的要求,但安全系数处于极限平衡状态。通过采用FLAC3D软件进行数值模拟,通过x、y、z方向位移等值线图和最大剪应变增量等值线图来分析坡体内应力-应变规律,为边坡稳定性评价提供依据。通过数值演化,中间湾矿区边坡可能出现沿岩土分界面的滑动破坏,深层滑坡发生的可能性不大。

The slope safety coefficient was determined by the Bishop method of circular sliding surface and Janbu method with the help of Rocscience Slid two-dimensional slope calculation software to determine the slope stability degree of the open slope in the middle bay sand shale mine of Huanggang Yadong Cement Co.It is found that the final slope safety coefficient in the normal condition can meet the requirements of the load combinationⅠ(1.15~1.10)of the slope engineering safety levelⅢunder the assumption of slope rock mechanical parameters.While the final slope safety coefficient designed in the seismic mode is the requirements of the load combinationⅡ(1.10~1.05)of the slope engineering safety levelⅢ,but the safety coefficient is in the limit equilibrium.Through numerical simulation with FLAC3D software,the stress-strain law within the slope is analyzed by means of displacement contour diagrams in x,y and z directions and maximum shear strain increment contour diagrams,which provide a basis for slope stability evaluation.Through the numerical evolution,the sliding damage along the rock-soil partition interface may occur in the slope of the middle bay mine,and the occurrence of deep landslide is unlikely.