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彭芳乐, 李福林, 平川大贵, 龙冈文夫. 格栅加筋挡土墙加载速率相关的变形强度特性分析及有限元模拟[J]. 岩土工程学报, 2011, 33(2): 174.
引用本文: 彭芳乐, 李福林, 平川大贵, 龙冈文夫. 格栅加筋挡土墙加载速率相关的变形强度特性分析及有限元模拟[J]. 岩土工程学报, 2011, 33(2): 174.
PENG Fang-le, LI Fu-lin, HIRAKAWA Daiki, TATSUOKA Fumio. Deformation and strength characteristics of geogrid-reinforced soil retaining wall under change of loading rate and its FEM simulation[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(2): 174.
Citation: PENG Fang-le, LI Fu-lin, HIRAKAWA Daiki, TATSUOKA Fumio. Deformation and strength characteristics of geogrid-reinforced soil retaining wall under change of loading rate and its FEM simulation[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(2): 174.

格栅加筋挡土墙加载速率相关的变形强度特性分析及有限元模拟

Deformation and strength characteristics of geogrid-reinforced soil retaining wall under change of loading rate and its FEM simulation

  • 摘要: 根据土工格栅加筋挡土墙的模型试验,分析研究了加筋挡土墙在加载速率变化条件下的变形和强度特征。试验中通过墙背填土顶面的条形基础在垂直方向施加荷载,加载过程中基础沉降速率不断发生变化,期间还包含蠕变加载和循环加载。试验发现土工格栅加筋挡土墙存在非常显著的速率相关的行为特性,即沉降速率发生变化时,基底压力–沉降曲线也发生相应的突变。这是填土材料(砂土)和加筋材料(土工格栅)本身黏性及其相互作用的综合反映。应用基于动态松弛法的非线性有限元求解技术对上述模型试验进行具体的有限元数值计算,其中砂土和土工格栅均采用统一的非线性三要素弹黏塑性本构模型进行模拟。计算与分析结果表明,综合考虑砂土和土工格栅的黏性特性的有限元计算方法能很好地模拟土工格栅加筋挡土墙在加载速率变化条件下的变形强度特性。

     

    Abstract: The deformation and strength characteristics of geogrid-reinforced soil retaining wall are investigated based on the results from physical model tests performed under change of loading rate. The model is vertically loaded with a rigid strip footing placed on the crest of the backfill. The vertical settlement rate of the footing is changed step by step several times and a set of creep loading and cyclic loading stages are performed during change of loading rate. The obvious rate-dependent behaviors of geogrid-reinforced soil retaining wall are observed. Namely, on a step-change in the loading rate, the footing pressure-settlement relation is changed correspondingly. It is due to the viscous properties of the backfill (sand) and the reinforcement (geogrid) and the interactions between them. On the basis of dynamic relaxation method, the nonlinear finite element method (FEM) analysis technique is developed to simulate the above physical model tests. In the FEM analyses, the unified three-component elasto-viscoplastic constitutive model is used to describe both sand and geogrid. It is shown that the aforementioned FEM can well simulate the deformation and strength behaviors of geogrid-reinforced soil retaining wall under change of loading rate.

     

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