| 饱和土结构性参数演化规律及其简化模型研究 |
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| 引用本文： | 胡伟,韩建刚,李光范.饱和土结构性参数演化规律及其简化模型研究[J].岩土力学,2011,32(9):2651-2655. |
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| 作者姓名： | 胡伟 韩建刚 李光范 |
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| 作者单位： | 海南大学土木建筑工程学院,海口,570228 |
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| 基金项目： | 海南省自然科学基金(No.809001); 海南省教育厅高等学校科学研究资助项目(No.Hjkj2010-08) |
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| 摘 要： | 引入两类超固结比的概念,对不同围压下,具有两类不同超固结比的饱和原状、重塑黄土试样进行三轴固结不排水剪切试验。结合应力分担率的定义对试验所得的应力-应变曲线进行整理,获得了应力分担率随应变水平呈两阶段变化的特征曲线。定义结构性发挥系数对应力分担率曲线进行归一化处理。结果表明:两类超固结比下,相同围压、具有不同超固结比的试样的结构性发挥系数演化规律具有很好的归一性;不同固结围压时,两类超固结比下,该系数也同样具有很好的归一性。由此提出了描述结构性演化规律的计算模式和相应的理论计算公式。结构性发挥系数的理论公式为一个3段式函数,形式简单、参数少,且具有较好的稳定性。对比分析表明:计算和试验结果具有很好的一致性。
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| 关 键 词： | 结构性 应力分担率 超固结比 应力发挥系数 应变阈值 |
| 收稿时间： | 2010-01-18 |
A simplified stress-strain relationship of saturated soil based on structure's evolution |
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| HU Wei,HAN Jian-gang,LI Guang-fan.A simplified stress-strain relationship of saturated soil based on structure's evolution[J].Rock and Soil Mechanics,2011,32(9):2651-2655. |
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| Authors: | HU Wei HAN Jian-gang LI Guang-fan |
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| Institution: | School of Civil Engineering and Architecture, Hainan University, Haikou 570228, China |
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| Abstract: | Two types of over-consolidated ratioes are defined.Undisturbed and remolded saturated loess are tested by undrained shearing test under different confining pressures and over-consolidated ratios.On the base of the definition of stress sharing ratios,the relationship between stress sharing ratio and strain level is obtained from test results,which behaves as two phases.Structure releasing coefficient is defined and it is used to analyze the stress sharing ratio curve.The results show that,under two types ove... |
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| Keywords: | structure stress sharing ratio over-consolidated ratio structure release coefficient strain threshold value |
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