针对极限平衡法(LEM)、有限元法(FEM)和有限元极限分析法(FELAM)在评估边坡稳定性时的差异性,以某土工格栅+框架锚索联合加固多级黄土高填方边坡治理工程为例,利用SLOPE/W、PLAXIS 2D和Optum G2三种数值模拟软件建立相应模型.在验证数值模型有效性的基础上,对比分析自重工况和暴雨工况下未加固边坡、土工格栅加固边坡和土工格栅+框架锚索加固边坡的稳定性.结果表明:LEM和FELAM对边坡稳定性的评估更为接近,而FEM获得的边坡稳定性评估结果比LEM和FELAM更为保守.在边坡稳定性评估和加固设计中,多种方法综合分析使得评估结果更为全面可靠.
To investigate the differences among the Limit Equilibrium Method (LEM), the Finite Element Method (FEM), and the Finite Element Limit Analysis Method (FELAM) in slope stability assessment, a remediation project of a multitiered high loess fill slope reinforced with a combined system of geogrids and frame anchor cables is taken as an example, and corresponding models are established using three numerical simulation software packages: SLOPE/W, PLAXIS 2D, and Optum G2. On the basis of validating the numerical models, a comparative analysis is carried out on the stability of unreinforced slopes, geogrid-reinforced slopes, and slopes reinforced with a combination of geogrids and frame anchor cables under self-weight conditions and rainfall conditions. The results show that the stability assessments obtained from LEM and FELAM are more consistent with each other, whereas the FEM-based results are more conservative than those from both LEM and FELAM. For slope stability evaluation and reinforcement design, a comprehensive analysis integrating multiple methods yields more thorough and reliable assessment outcomes.
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