加筋土护岸挡墙的黏弹塑性有限元分析

结合重庆渝中区长江滨江路加筋土护岸工程的安全性评估和加固方案研究,发展了二维有限元数值分析方法。分析中考虑加筋材料的非线性蠕变效应,土体采用黏弹塑性流变模型和加筋材料采用黏弹性模型,并考虑加筋材料与填土、填土与面板及面板之间的相互作用;计算模拟了加筋土工程逐层填筑的施工过程,采用增量–初应变迭代法对各种工况进行了分析计算。计算结果与传统方法计算结果、现场实测数据进行了对比,初步证明本文方法的有效性,并得到了高大加筋土挡墙的破坏发展模式、加筋材料拉力分布规律以及加筋土护岸挡墙的安全性指标。

Reinforced earth retaining walls by FEM based on visco-elasto-plasticity

In order to study the security evaluation and reinforcement option of reinforced bank-protection works on Binjiang road in Yuzhong district of Chongqing,a numerical procedure based on the finite element methods for analysis of behavior of deformations and stresses of reinforced earth structures was presented.In the proposed method,the nonlinear creep behavior of both backfill and geosynthetics used for reinforcements was taken into account by using the rheological models of visco-elasto-plasticity and nonlinear visco-elasticity respectively.Additionally,the interaction effects between the reinforcement and the backfill,the panel and the backfill as well as the panel and the panel were rationally considered.The layer-by-layer filling process of backfill of retaining wall was also simulated.Comparing with the conventional calculation methods and the field measured data,the effectiveness of the method was provend tentatively.Meanwhile,the failure mode,the distribution of tensile stress in reinforcing materials and the safety index in high reinforced retaining walls were obtained.