Experimental study on development model of excess pore pressure for saturated coral sand based on shear strain characteristics

被引：0
|
作者：
Wu Q. [1 ,2 ]
Wang L. [1 ]
Liu Q. [1 ]
Zhou Z. [1 ]
Ma W. [3 ]
Chen G. [1 ]
机构：
[1] Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing
[2] Faculty of Architecture, Civil and Transportation Engineering, Beijing University of Technology, Beijing
[3] School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing
来源：
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | 2023年 / 45卷 / 10期
关键词：
coral sand; equivalent skeleton void ratio; excess pore pressure; fines content; shear strain;
D O I：
10.11779/CJGE20220956
中图分类号：
学科分类号：
摘要：
A series of undrained cyclic torsional shear tests are carried out on the saturated coral sand specimens from Nansha Islands by using the hollow cylinder torsion shear apparatus. The aim of the tests is to investigate the effects of fine contents(FC), relative density (Dr) and applied cyclic stress ratio CSR on the generated excess pore pressure ratio Ru of the specimens. The test results show that: the development rate of Ru-N curve increases with the increasing FC and CSR, but decreases with the increasing Dr. In addition, the development rate of Ru-N curve of the saturated coral sands significantly exceeds that of the terrestrial quartz sands, and the traditional Seed pore pressure model is not fully applicable to characterize the development pattern of the excess pore pressure of coral sands. For the same Dr and FC, Ru of the specimens under different CSR is uniquely related to the shear strain amplitude (γa). A pore pressure evaluation model based on the shear strain characteristics is established, and the analysis shows that the pore pressure model parameter A is a soil-specific constant, and the density-corrected pore pressure model parameter B/(Dr)1.5 has a single negative power function relationship with the equivalent skeleton void ratio esk*. © 2023 Chinese Society of Civil Engineering. All rights reserved.
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页码：2091 / 2099
页数：8
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