地层条件对剪胀性砂土边坡地震后延迟变形的影响

王刚; 张建民; 魏星

doi:10.11779/CJGE201607024

地层条件对剪胀性砂土边坡地震后延迟变形的影响 English Version

1. 重庆大学土木工程学院,重庆 400044；
2. 水沙科学与水利水电工程国家重点实验室,北京 100084；
3. 西南交通大学土木工程学院,四川成都 610031

基金项目: 国家自然科学基金项目（51209179）；水沙科学与水利水电工程国家重点实验室开放研究基金项目（sklhse-2015-D-02）

详细信息

作者简介:
王刚（1978– ），男，博士，教授，主要从事土的本构理论、土动力学及地震工程、数值分析等方面的研究工作。E-mail: cewanggang@163.com。

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出版历程
- 收稿日期: 2015-05-24
- 发布日期: 2016-07-24

Effect of soil profile on post-earthquake delayed deformation of sand slopes

1. School of Civil Engineering, Chongqing University, Chongqing 400044, China;
2. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China;
3. Department of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

摘要

摘要: 剪胀性砂土流滑现象与自然排水条件下孔压重分布导致的局部土体强制吸水有关,须放在具体边值问题中来阐释。同时考虑孔隙水压力扩散、转移以及吸水剪切下饱和砂土应力应变行为的流动变形简化分析方法,研究了相对不透水层的位置、地基土体的渗透系数对边坡地震后延迟变形的影响特征和规律。地震后延迟侧向变形总是集中发生在孔隙水渗流被阻滞的界面,界面处砂土强制吸水量越大,发生的侧向位移量就越大;设置穿透相对不透水层的排水通道可有效减小边坡的侧向变形。地震后侧向流动变形的发展过程取决于孔隙水扩散、转移的速度,是由具体边值问题中土体的渗透系数决定的,饱和土体的黏滞特性对于变形发展过程的影响可以忽略。
- 砂土 /
- 剪胀 /
- 地震后变形 /
- 流滑 /
- 地层分布
Abstract: The post-earthquake flow deformation of dilative sand is associated with the compulsory water absorption due to seepage water inflow in boundary value problems. A simplified procedure, which can both reproduce the diffusion and migration of excess pore water pressure and describe the behavior of sand under water absorption conditions, is employed to study the effect of different soil profiles and soil permeability on the post-earthquake flow deformation of sand slopes. It is found that the flow deformation always concentrates on the interface where the flow of the seepage water is blocked. The thicker the liquefied layer beneath the interface is, the larger the water absorption amount of the sand on the interface is, and hence the flow deformation is larger. The amount of flow deformation can be reduced greatly by setting drainage columns to mitigate the accumulation of the excess pore water pressure beneath the blocking interface. More importantly, it is suggested that the rate of flow deformation should be controlled by the permeability of soil, and the viscosity of the materials can be ignored practically.
- sand /
- stress dilatancy /
- post-earthquake deformation /
- flow liquefaction /
- soil profile

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参考文献(13)

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