基于组合赋权法的岩质边坡稳定性敏感因素研究

边坡稳定性评价是一个涉及多因素、多层次的高度非线性系统。针对影响边坡稳定性因素的复杂性和不确定性以及敏感因素区分度的不显著性,结合G316抚州资溪花山界至南城黄狮渡段公路改扩建工程,以岩质边坡内部参数、几何形状以及外部荷载所包含的7个因素作为稳定性敏感分析对象。通过有限元强度折减法和单因素分析法确定评价指标因素的敏感度,得出两两因素间的相对重要程度关系,利用层次分析法将定性、定量分析相结合,合理确定各因素的权重。通过岩质边坡原始数据间的关系,运用熵值法来确定各因素的变异性和权重,最后借助主客观组合赋权法对各因素权重进行赋权,确定对边坡稳定性最为敏感的因素,以期为边坡治理和优化设计提供参考。

Study on Sensitive Factors of Rock Slope Stability Based on Combination Weighting Method

Slope stability evaluation is a highly nonlinear system involving many factors and layers. In view of the complexity and uncertainty of the factors affecting the slope stability and the insaliency of the sensitive factor discrimination, combined with G316 Fuzhou Zixi Huashan boundary to South City Huangshidu section highway reconstruction and expansion project, seven factors included in internal parameters, geometric shapes, and external loads of rock slopes are used as stability-sensitive analysis objects. The sensitivity of the evaluation index factors is determined by the finite element strength reduction method and the single factor analysis method. The relative importance relationship between the two factors is obtained. The qualitative and quantitative analysis is combined with the analytic hierarchy process, and the weight of each factor is determined. Through the relationship between the original data of rock slope, entropy method is used to determine the variability and weight of various factors. Finally, the weight of each factor is weighted by the subjective and objective combination weighting method to determine the most sensitive factors to the stability of the slope, so as to provide reference for the slope control and optimization design.