Design method and application of horizontal bottom sealing curtains for deep foundation pits excavated in deep aquifers with high permeability

被引：1
|
作者：
Cao C. [1 ]
Shi C. [1 ]
Peng L. [1 ]
Jiang S. [2 ]
Liu S. [2 ]
Liu J. [1 ]
机构：
[1] School of Civil Engineering, Central South University, Changsha
[2] Guangzhou Metro Design & Research Institute Co. Ltd., Guangzhou
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2020年 / 51卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Bottom sealing curtains; Design method; Foundation pits; Highly-permeable aquifers;
D O I：
10.11817/j.issn.1672-7207.2020.04.016
中图分类号：
学科分类号：
摘要：
Based on different failure mechanisms of horizontal bottom sealing curtains for deep excavations that are undertaken in deep aquifers with high permeability, computational methods for horizontal bottom sealing curtains were established considering "instability failure" and "seepage failure" mechanisms, respectively. Then, the design parameters of bottom sealing curtains for an excavation case were determined using the established methods. Finally, the performance of deep horizontal bottom-sealing curtains was analyzed through pumping tests. The results show that the water-tightness performance of horizontal bottom-sealing curtains constructed at site is good. The water level inside the excavation can meet the construction requirements, and the water level outside the excavation has no change basically during pumping tests. When the water level stabilizes at the final period of the pumping test, the leakage of bottom-sealing curtains is lower than the maximum designed allowable seepage. © 2020, Central South University Press. All right reserved.
引用
收藏
页码：1012 / 1021
页数：9
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