岩土工程学报2017，Vol.39Issue(z2)：71-74,4.DOI:10.11779/CJGE2017S2018
双向激振循环荷载和振动频率共同作用下饱和软黏土孔压试验研究
Coupling effects of bidirectional cyclic loading and loading frequency on pore water pressure of saturated soft clay
摘要
Abstract
A series of undrained cyclic tests with variable confining pressures are conducted on Ningbo saturated soft clay by using the GDS cyclic triaxial system. In this study, the coupling effects of cyclic deviatoric stress and cyclic confining pressure on the pore water pressure of Ningbo saturated soft clay in real traffic loading are simulated. The developments of pore water pressure of saturated soft clay subjected to bidirectional cyclic loading are investigated with different cyclic stress ratios, cyclic confining pressures and vibration frequencies. It is observed that the pore water pressure increases with higher cyclic stress ratios and cyclic confining pressure, but decreases with higher frequencies under bidirectional cyclic loading. The relationships between pore water pressure ratio and cyclic time are identical under different values of η and frequencies. The slope of stress paths η and cyclic stress ratios CSR affect the relationship between pore water pressure ratio and cyclic time significantly, and the pore water pressure ratio increases with the increase of η and CSR. However, the effect of frequency on the curves of pore water pressure ratio and loading time is indistinct. The observations imply that the coupling effects of cyclic confining pressure and loading frequency on the pore water pressure should also be considered to estimate the values of pore water pressure.关键词
宁波黏土/循环应力比/循环围压/振动频率/孔压Key words
Ningbo clay/cyclic stress ratio/cyclic confining pressure/loading frequency/pore water pressure分类
建筑与水利引用本文复制引用
黄珏皓,陈健,柯文汇,钟宇,邱岳峰..双向激振循环荷载和振动频率共同作用下饱和软黏土孔压试验研究[J].岩土工程学报,2017,39(z2):71-74,4.基金项目
国家重点基础研究发展计划("973")项目(2015CB057905) （"973"）
中国科学院科技服务网络计划(STS)(KFJ-EW-STS-122) （STS）
NSFC-云南联合基金重点支持项目(U1402231) （U1402231）
