| 软土在不同应力路径下的力学特性分析 |
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| 引用本文： | 曾玲玲,陈晓平.软土在不同应力路径下的力学特性分析[J].岩土力学,2009,30(5):1264-1270. |
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| 作者姓名： | 曾玲玲 陈晓平 |
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| 作者单位： | 1. 东南大学,岩土工程研究所,南京,2100962
2. 暨南大学,力学与土木工程系,广州,510632 |
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| 基金项目： | 广东省水利科技计划项目，广东省科技计划项目，湖北省环境岩土工程重点实验室开放基金 |
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| 摘 要： | 通过固结不排水剪应力路径试验对广州南沙典型软土在不同固结条件的力学特性进行了系统研究。分析了初始固结状态对软黏土应力路径依赖性的影响，比较了不同应力路径下土的应力-应变关系特征和孔隙水压力变化规律，探讨了孔压分布与土体变形特征的关系，认为侧向卸荷会造成剪应力增加、体应力减小，从而使土体产生剪胀趋势。研究结果还表明，不排水条件下的有效应力路径主要与土样初始固结状态有关，因而同一固结状态下的有效应力路径具有唯一性。另外，试验中的剪切控制方式对有效应力路径有明显影响，但对土体抗剪强度的影响可以忽略。
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| 关 键 词： | 应力路径 软土 室内试验 力学特性 |
| 收稿时间： | 2007-11-20 |
Analysis of mechanical characteristics of soft soil under different stress paths |
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| ZENG Ling-ling,CHEN Xiao-ping.Analysis of mechanical characteristics of soft soil under different stress paths[J].Rock and Soil Mechanics,2009,30(5):1264-1270. |
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| Authors: | ZENG Ling-ling CHEN Xiao-ping |
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| Institution: | 1. Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China; 2. Department of Mechanics and Civil Engineering, Jinan University, Guangzhou 510632, China |
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| Abstract: | Based on a series of consolidated-undrained stress path tests, the mechanical characteristics of soft soil from Guangzhou Nansha under different consolidation conditions are systematically studied. The effect of initial consolidation on stress paths dependence of soft clay is analyzed; the characteristics of stress-axial strain relation and pore water pressure distribution under different stress paths are compared; and the connection of pore pressure and soil deformation state is discussed; the lateral unloading will induce shear dilatation of clay soil because of shearing stress increased and volume stress decreased. The test results also show that the effective stress paths under consolidated undrained shear is main related to initial consolidation; as a result the effective stress paths is only one under the same consolidated state. In addition, shear controlled mode of test has evident effect on the effective stress paths, but little influence on soil shear resistance. |
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| Keywords: | stress path soft soil laboratory test mechanical characteristics |
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