半填半挖路基交接面稳定性分析

分析了交接面对半填半挖路基稳定性的影响因素，在总体上将其归纳为几何特征和物理力学参数两类。研究了交接面的台阶特征、填料物理力学参数的差异性，分析了不平衡推力法在条块划分、计算结果误差方面的不足，阐明了不平衡推力法用来分析半填半挖路基交接面的稳定性的缺陷，推荐以改进的Sarma（MSarma）方法替换。以某公路半填半挖路基交接面分析为基础，将正交试验设计方法、统计方法和MSarma方法结合起来，形成了半填半挖路基交接面稳定性力学机制分析方法。采用该法研究了半填半挖路基交接面3种工况条件下各种因素对路基稳定性系数影响的敏感性排序，前4位依次为黏聚力、内摩擦角、交接面和地基倾角。在研究这4个主要参数与稳定性系数量化关系并比较变化趋势的基础上，为填料、交接面参数及路基形式选择提供了指导原则。

Mechanism analysis of stability of cut-and-fill roadbed interface

The influence factors of the interface on the cut-and-fill roadbed are studied; and reducing these to two kinds as a whole, geometrical features and physico-mechanical parameters. The characteristics of interface step and the discrepancy of the filling physico-mechanical parameters are researched; and it is indicated that there are limitations in the imbalanced thrust method, such as in plotting slices and there is error in the count result. So the author illuminates that the imbalanced thrust method is unsuitable to be used in analyzing the stability of cut-and-fill roadbed basing on interface. And the MSarma method which is developed freshly to replace the imbalanced thrust method is recommended. Based on mass of cut-and-fill roadbed interfaces in a highway and combining the orthogonal design, statistic method and MSarma method, the mechanical mechanism analytical method for analyzing the stability of cut-and-fill roadbed interface is formed. This method is used to analyse the stability of cut-and-fill roadbed interface in three different cases; and the sensitivity priority of each factor to stability coefficient of roadbed is also given; the rank top 4 are cohesive force, internal friction angle, interface and roadbed obliquity; and then the selecting principle of filling, interface parameters and the form of roadbed is advanced, which is based on the study of the quantity relation between the four parameters and stability coefficient and comparing the variety trend.