曼家寨露天采场西帮边坡原位直剪试验研究

In-situ Direct Shear Test Study of West Slope of Manjiazhai Open-pit

针对曼家寨露天采场工程地质现状,在西帮边坡通过现场调查确定出有代表性的岩土层,采用人工挖坑,用土石袋堆载方法进行了现场原位直剪试验。对试验数据整理分析,获得了τ-ε曲线图,用最小二乘法回归得出抗剪强度σ-τ关系曲线图和相应的抗剪强度参数c、值及相关系数r。试验表明,西帮边坡原位直剪试验研究对露天采场边坡稳定性评价及工程治理优化具有重要价值。

According to geological situation of the Manjiazhai open-pit project, more representative rock-soil layer at west slope confirmed through field investigation, in-situ direct shear test was done by u- sing artificial digging and soil-stone bags load method. Through analysis of experimental data, τ - ε curve obtained, shear strength σ -τ relationship curve and corresponding shear strength parameters c, Фvalue and correlation coefficient r were obtained by using least squares regression. The test indicates that in-situ direct shear test of west slope has the important value to slope stability evaluation of open pit and engi- neering optimization.