基于未确知测度理论与Midas/GTS模拟的边坡稳定性分析

The Analysis on the Slope Stability Based on the Uncertain Measure Theory of and the Midas/GTS Simulation

为研究岩质边坡的稳定性,基于未确知测度理论,建立评价模型。经过分析影响边坡稳定性因素,决定以RQD、岩体结构特征、地应力、C、φ、坡高、日最大降雨量作为评价指标,构造稳定性分析模型及函数。通过改进层次分析法求取指标权重,并按照置信度识别准则获得最终的稳定性评价等级。将此分析模型应用到某边坡工程中,分析结果表明,该边坡处于极不稳定状态。同时采用有限元软件Midas/GTS对该边坡进行了模拟分析,得到安全系数为0.2875,属极不稳定边坡。两种方法计算结果一致,说明基于未确知测度理论的模型具有一定的应用性和科学性。

In order to study the stability of. rock slope, evaluation models were established on the basis of the uncertainty measure theory. Through the analysis of the influence factors of slope stability, there were several factors to be selected as evaluation indexes, including RQD, the structure characteristics of rock mass, stress, C, φ slope height, daily maximum rainfall, and the stability analysis models and functions were built. The index weights were obtained by the improved analytic hierarchy process, and the final grade of stability evaluation was determined by the credible identification criteria. Thus with applying this analytical model to a slope engineering practice, the analyzed results showed that the slope was fairly unstable. Meanwhile the simulation analysis of slope was carried out by the finite element software called Midas/GTS, which got the safety factor as 0. 2875, so the slope was extremely unstable. Because, the calculated results of both the two methods were consistent, it indica- ted that the models based on uncertainty measure theory had applicability and scientificity to some extent.