基于突变级数法的拉裂—滑移式黄土崩塌稳定性分析

Stability Analysis of Tensile Cracking Sliding Loess Collapse Based on Catastrophe Series Method

为研究拉裂—滑移式黄土崩塌的稳定性问题,分别采用极限平衡法和突变级数法得到崩塌体的最小安全系数计算公式和稳定性评价模型,以正交试验法得到的25个试验边坡为算例进行对比分析,得到拉裂—滑移式黄土崩塌稳定性评判准则,并进行实例验证。结果表明,各控制变量中,对崩塌体稳定性影响最大的为边坡坡角,最小的为黄土的天然重度;利用突变级数法得到的稳定性评价结果与极限平衡法得到的结果基本一致。这说明突变级数法在分析拉裂—滑移式黄土崩塌稳定性时,可综合考虑多种因素的影响,弥补了极限平衡法带来的不确定性,具有实际应用价值。

In order to study the stability of the tensile cracking sliding loess collapse,the calculation of minimum safety factor and the stability evaluation model were obtained by the limit equilibrium method and catastrophe series method,respectively.The 25test slopes obtained by the orthogonal test method were used as examples for comparative analysis.The results show that among the control variables,the largest impact on the stability of the collapse body is the slope angle of the slope,and the smallest is the natural gravity of the loess.The stability evaluation result obtained by catastrophe series method is basically consistent with the limit equilibrium method.It demonstrates that the catastrophe series method can comprehensively consider the impact of various factors when analyzing the stability of the tensile crackingsliding loess collapse,which makes up for the uncertainty in the analysis of the stability of the collapse body by the limit equilibrium method,and has practical application value.