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露天开采剥离物形成的尾渣场,其特性及破坏过程与土质边坡、岩质边坡均有不同。使用有限元分析软件ABAQUS,应用强度折减弹塑性原理,结合工程实例对尾渣场边坡进行了稳定性分析。采用不同临界破坏判据分析安全系数,结果表明,采用特征部位位移比塑性区贯通为判据得到的安全系数更具有实际意义,同时使用极限平衡法进行对比计算,得到的值基本一致。对塑性区的发展过程进行分析,尾渣场边坡是先在中上部出现塑性变形,然后向上再向下发展,最后贯通而导致边坡最终破坏,这是尾渣场边坡破坏的自身规律。通过位移等值线云图及增量位移的方法判断了滑动面的位置,得出其破坏面为近似直线的形状。将分析结果与实验室破坏模型试验进行对比,其结论是一致的。
The tailings field formed by the stripping of opencast mining is different from the soil slope and rock slope in its characteristics and destruction process. The finite element analysis software ABAQUS is used to analyze the stability of the tailing yard slope by applying the strength reduction elastic-plastic principle and engineering examples. The analysis of safety factor using different critical damage criterion shows that it is more practical to use the safety factor obtained by the displacement of the characteristic part than that of the plastic zone and the limit equilibrium method is used to calculate the safety factor. The obtained values are basically the same. Analysis of the development of plastic zone, tailings slope is the first plastic deformation in the upper and middle, and then upward and downward development, and finally lead to the ultimate destruction of the slope, which is tailings tailings slope failure of its own law . The position of the sliding surface is judged by the displacement contour image and the incremental displacement method, and the shape of the damage surface is approximated as a straight line. The results of the analysis are compared with those of the laboratory failure model test. The conclusion is consistent.