评价高边坡断层的直接约束方法

为正确评价断层对于岩石高边坡安全稳定性的影响,采用接触力学的求解方法——直接约束法模拟断层的滑移和脱开等不连续行为。重点分析了岩体中断层不同的接触性状(如考虑断层与岩体的滑移脱开)。应用弹塑性有限元方法对彭水水电站船闸高边坡分步开挖过程进行了数值仿真分析。通过不模拟滑移脱开与模拟滑移脱开的对比研究,模拟滑移脱开后断层的变形和塑性区显著增大,在断层处变形较大以致于有滑坡的可能。该项研究在岩石高边坡稳定分析中具有重要的意义。

Direct constraint procedure for evaluating faults on steep slopes

A direct constraint procedure was used to model the discontinuous mechanical behavior(such as sliding and disjointing) of faults and weak interlays in steep slopes to evaluate the safety of such slopes.The direct constraint procedure is the most robust procedure for contact mechanics.The elasto-plastic FEM was used to model the contact characteristics between the faults and the rock mass to analyze the excavation process for the Pengshui hydropower station.The results show that the magnitude and distribution of the deformation,the stresses and the plastic yield zones are all greatly increased by the sliding and disjoining,which increase the probability of landslides affecting the slope safety.