三峡泄滩滑坡滑动带土的改进Mesri蠕变模型
Modified Mesri s Creep Model for Soils in Sliding Zone of Xietan Landslide in the Three Gorges
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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.
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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
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.
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