基于非确定性的坡间路基失效机制分析方法

Failure mechanism analysis of subgrade slopes based on uncertainty

通过对矿业、水电与公路等领域的坡间岩土边坡结构特征研究,在揭露山区坡间挖填路基这种新型边坡结构刚性滑动和变形差异复合失效机理的基础上,甄荐了相应分析模式和表征指标。针对影响失效因素之间的高度非线性交互作用效应,利用基于数论偏差理论的稳健性试验设计原理,构造了超立方多维空间抽样准则。针对因素存在的未确知性和非确定性,将模糊灰色关联规则嵌入区间模型,导出了模糊灰色区间关联度算法。抽样准则为计算模式提供输入参数,关联度算法辩识出各基本参数对表征指标的敏感与重要程度,从而揭示出坡间挖填路基失效的内在机制,为处治方案设计指明方向。实例分析显示了上述研究成果的实用性和有效性。

The features of geotechnical slope structures are studied in the fields of mining industry,hydropower and highway.The corresponding analysis model and characterization indices for the new geotechnical slope structures are recommended based on the rigid sliding and deformation difference composite failure mechanism.By means of the robustness method of test design based on the arithmetical deviation theory,the principles of hypercube multidimensional space sampling are established.They are also used to reflect the highly nonlinear operator interaction among the factors which cause failures.The fuzzy grey correlation degree and the interval algorithm are deduced by embedding the fuzzy grey correlation rules into the interval model so as to solve the uncertainty and unknown problems existing in the factors.The input parameters in the calculation model are provided according to the sampling criterion.Meanwhile,the influencing parameters are displayed by the degree algorithm on the characterization of the sensitivity and importance degree index.They form a definite treatment method to demonstrate the failure mechanism of slope structures.Finally,the engineering application examples show the feasibility and effectiveness of the proposed method.