索矿露天边坡最终边坡角优化与破坏特征分析

The Analysis of the Final Sloping Angle Optimization and Failure Characteristics on the Slope in Suo Open Pit Mine

露天边坡角优化的前提是保证边坡的稳定,以新疆索矿极坚硬岩石边坡为例,利用Hoek-Brown准则将室内岩石力学参数折减成岩体参数,借助FLAC3D软件,采用强度折减理论对极坚硬岩质最终边坡角进行优化研究。研究结果表明：最终边坡角由原设计的60°提高至65°,极坚硬岩质边坡破坏类型属于平面滑动破坏,坡体以剪切破坏为主,坡脚的剪应变增量最大,剪应变增量区域从坡脚贯通到坡顶;坡脚的位移量最大,其位移方向水平向左、向上,坡顶位移向下。

Ensuring the stability of the slope is the premise of the slope angle for optimization. Taking an extremely hard rocks slope in Xinjiang as an example, indoor rock mechanics parameters are reduced to the rock mass parameters by Hock- Brown strength criterion firstly. Then the sloping angle is analyzed and optimized using the strength reduction theory by FLAC3D. The results show that the final sloping angle is increased from 60 to 65. Failure type of extremely hard rock belongs to the plane sliding failure. Shear failure is the main failure type of the slope. The shear strain increment is taken from the bottom of the slope to the top and maximum shear strain increment appears at the bottom of the slope. The maximum displacement of the slope occurred in the slope foot and the displacement direction is horizontal to the left and up. The displacement direction of the top is down.