论文部分内容阅读
为研究竖向张拉裂缝对边坡稳定性的影响,采用极限分析上限法,并考虑稳定渗流场作用,基于边坡的对数螺旋破坏机制,构建了含垂直张拉裂缝的破坏模式,推导了边坡临界高度和安全系数的计算公式.将计算结果与已有未考虑张拉裂缝的极限分析计算结果和极限平衡法的计算结果进行对比.并通过算例分析,研究了孔隙水压力系数变化和抗剪强度参数变化对边坡稳定性以及张拉裂缝临界深度的影响.结果表明:采用的破坏模式是合理的,张拉裂缝的存在降低了边坡的稳定性.强度参数增大提高了边坡的安全性,但随着孔隙水压力的增大,内摩擦角的增大对边坡安全系数增大的影响程度降低,而粘聚力的影响则变化不大;裂缝临界深度随着粘聚力和内摩擦角的增大而增大.
In order to study the influence of vertical tension cracks on slope stability, the limit analysis upper bound method and the steady flow field are considered. Based on the logarithmic spiral failure mechanism of slopes, a failure mode with vertical tension cracks is constructed and deduced The calculation formula of critical height and safety coefficient of slope is compared with the calculation results of limit analysis and limit equilibrium method which have not considered the tensile fracture.According to the example analysis, the effect of pore water pressure coefficient The results show that the failure mode adopted is reasonable and the stability of the slope is reduced by the presence of the tensile crack.The strength parameter increases and increases However, with the increase of pore water pressure, the influence of the increase of internal friction angle on slope safety factor decreases, while the influence of cohesion does not change much. The critical depth of fracture With the increase of cohesion and internal friction angle increases.