排灌水条件下砂黏土层变形响应模型箱试验

刘春; 施斌; 吴静红; 汪义龙; 姜洪涛

doi:10.11779/CJGE201709025

排灌水条件下砂黏土层变形响应模型箱试验 English Version

刘春^{1, 3},
施斌^1, ,,
吴静红¹,
汪义龙¹,
姜洪涛²

1. 南京大学地球科学与工程学院,江苏南京 210023;
2. 地质灾害防治与地质环境保护国家重点实验室（成都理工大学）,四川成都 610059;
3. 南京大学（苏州）高新技术研究院,江苏苏州 215123

基金项目: 国家自然科学基金项目（41230636, 41372265, 41302216）; 地质灾害防治与地质环境保护国家重点实验室开放基金项目（SKLGP2015K018）

详细信息

作者简介:
刘春(1984- ),男,福建顺昌人,副教授,主要从事计算工程地质领域的教学和科研工作。E-mail: chunliu@nju.edu.cn。

通讯作者:
施斌，E-mail：shibin@nju.edu.cn

中图分类号: TU411
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出版历程
- 收稿日期: 2016-06-04
- 发布日期: 2017-09-24

Model box tests on response of deformation of sand and clay layer under draining-recharging condition

1. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China;
2. State Key Laboratory of Geo-hazard Prevention and Geo-environment Protection, Chengdu Universityof Technology, Chengdu 610059, China;
3. Nanjing University (Suzhou) High-tech Institute, Suzhou 215123, China

摘要

摘要: 地面沉降区野外钻孔土层应变监测数据表明,含水砂层上方的黏土层存在着明显的压应变。为研究这一现象,建立了砂黏互层小型模型箱,沿土层竖直方向埋设分布式应变监测光纤,水位管和沉降标。开展了3次排灌水循环试验,并监测土层在竖直方向上的应变,水位高度和沉降量的变化。试验结果表明：在3次排灌水循环中,土体渗透率减小,土体被压密;黏土层存在水压变化的滞后现象;排水过程中,黏土层中的孔隙水出现负压,相应区域也出现显著的压应变。结合前人研究,分析讨论了钻孔应变数据与模型箱试验结果,得出结论：砂层排水后,黏土层释水和补给不平衡,导致负压的出现,并在黏土层中产生额外的有效应力和压缩变形。在地下水位波动时,这种效应可能会导致砂层上方的黏土层被持续缓慢压缩。
- 模型箱 /
- 砂黏互层 /
- 负压 /
- 压应变
Abstract: The field monitoring data of borehole in land subsidence region indicate that the compressive strain is significant in clay layers above saturated sand layers. To study this phenomenon, a small sand-clay interbed model box is built, in which the distributed strain monitoring fiber, water table and settlement mark are embedded along the vertical direction. Three draining-recharging test cycles are carried out, and the variations of strain of soil layers, height of water table and settlement amount are monitored. The test results show that the overall permeability of soils decreases, and the soil layer is compressed during the three draining-recharging cycles. The delay phenomenon of water pressure variation exists in the clay layers. In the draining tests, the negative pressure of pore water is observed in the clay layers, and significant compressive strain is also observed in the same region. Considering the previous studies, the monitoring data of borehole and the results of model tests are compared and discussed. It is concluded that the release and supply of water in the clay layers is not equibrium when draining in the sand layers, which leads to the emergence of negative pressure, and the extra effective stress and compressive strain are generated in the clay layers. With the fluctuation of groundwater table, this effect may result in the continuous slow compression in the clay layers above the sand layers.
- model box /
- sand-clay layer /
- negative pressure /
- compressive strain

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参考文献(16)

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