| 上海地区基坑开挖卸荷土体回弹变形试验研究 |
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| 引用本文： | 李德宁,楼晓明,杨敏.上海地区基坑开挖卸荷土体回弹变形试验研究[J].岩土力学,2011,32(Z2):244-249. |
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| 作者姓名： | 李德宁 楼晓明 杨敏 |
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| 作者单位： | 1.同济大学 地下建筑与工程系，上海 200092；2. 同济大学 岩土及地下工程教育部重点实验室，上海 200092 |
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| 基金项目： | 国家自然科学基金资助项目(No.50978201) |
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| 摘 要： | 通过对上海地区某基坑工程坑底不同深度土样进行一系列K0固结不排水三轴卸荷试验，对上海地区不同深度土层随基坑开挖卸荷变形性状进行研究。研究不同深度的不同土层在两种典型卸荷应力路径下的变形特性，分析了回弹率及回弹模量与卸荷比的变化关系。结果表明，软土的初始卸荷模量Ei及最大回弹率 不仅取决于土层性质，还与所经历的不同卸荷应力路径、预压最大荷载等有关，且不同卸荷路径下土体发生强回弹变形的极限卸荷比亦不同
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| 关 键 词： | 回弹模量 回弹率 卸荷比 卸荷路径 |
| 收稿时间： | 2011-04-18 |
Experimental researches on unloading resilient deformation properties during excavations in Shanghai area |
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| LI De-ning,LOU Xiao-ming,YANG Min.Experimental researches on unloading resilient deformation properties during excavations in Shanghai area[J].Rock and Soil Mechanics,2011,32(Z2):244-249. |
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| Authors: | LI De-ning LOU Xiao-ming YANG Min |
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| Institution: | 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China |
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| Abstract: | To get the unloading deformation properties of soft ground during excavations in Shanghai area,a series of K0 consolidation and undrained triaxial unloading tests have been carried out to study the unloading deformation properties of soil samples at different bottom depths of a deep excavation in Shanghai under two different unloading stress paths.The relationship of the resilience rate and the resilient modulus with the variation of unloading ratio was analyzed.According to the experimental results,the ini... |
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| Keywords: | resilient modulus resilience rate unloading ratio unloading path |
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