西南交通大学学报 2004, 39(1) 15-19 DOI:     ISSN: 0258-2724 CN: 51-1277/U

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本文关键词相关文章
滑动带土
三轴排水蠕变试验
Mesri蠕变模型
剪应力-应变-时间关系
改进Mesri蠕变模型
本文作者相关文章
王 琛
刘浩吾
许 强
PubMed
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三峡泄滩滑坡滑动带土的改进Mesri蠕变模型

王 琛;刘浩吾;许 强

四川大学水利水电学院,四川成都610065;成都理工大学环境与土木工程学院,四川成都610059

摘要

为进行滑坡建模和稳定数值分析的需要,进行了三峡泄滩滑坡体滑动带土的三轴排水蠕变试验.在此基 础上,给出了排水条件下粘性土的Mesri蠕变模型,即剪应力-应变关系采用双曲线模型、应变-时间关系采用幂 函数来描述土体的弹粘塑性;提出了改进Mesri蠕变模型,其应变-时间关系采用分段拟合方法.模型计算曲线与 试验数据的比较表明,改进Mesri蠕变模型较Mesri蠕变模型对粘性土蠕变性能的拟合能力得到了显著改善.

关键词 滑动带土   三轴排水蠕变试验   Mesri蠕变模型   剪应力-应变-时间关系   改进Mesri蠕变模型   

Modified Mesri s Creep Model for Soils in Sliding Zone of Xietan Landslide in the Three Gorges

WANG Chen;LIUHao-wu;XUQiang

College of WaterResource andHydropower, SichuanUniversity, Chengdu 610065, China;College of Environment and Civil Eng., Chengdu University of Technology, Chengdu 610059, China

Abstract:

In orderto provide the basementof a further numerical analysis, the drained triaxial compression creep tests with a constant stress were carried out for soils in the sliding zone of Xietan landslide in the Three Gorges. Based on these tests, a shear stress-strain-time function, namely, Mesri s creep model, in which a hyperbolic linewas adopted for describing the shear stress-strain behaviour and a power function for the strain-time behaviour, was given. A modified Mesri s shear stress-strain-time model was proposed. In this model, the strain-time behavior of the soilswas simulated by subsection. Through contrast of computed curvesbased on the two models and test data, the result shows that the modified Mesri s model has an advantage over the Mesri s model in the simulation capability for creep behaviours of clay.

Keywords: drained triaxial creep test   Mesri s creep model   shear stress-stain-time behaviour   modified Mesri s creep model    soils in sliding zone  
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