Page 50 - 水利学报2021年第52卷第11期

Analysis of the effect of cyclic spherical-deviatoric stress coupled with
dynamic characteristics of saturated tail sand under high-stress conditions

1，2，3 2 3
LIU Junxin ，YUAN Huaicen ，ZHANG Chao ，
2
2
ZHANG Jianxin ，LIU Yutian ，WANG Guangjin 4
（1. Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province，
Southwest University of Science and Technology，Mianyang 621010，China；
2. School of Civil Engineering and Architecture，Southwest University of Science and Technology，Mianyang 621010，China；
3. State Key Laboratory of Geomechanics and Geotechnical Engineering， Institute of Rock and Soil Mechanics，
Chinese Academy of Sciences，Wuhan 430071，China；
4. Faculty of Land Resources Engineering， Kunming University of Science and Technology， Kunming 650093， China）

Abstract： Affected by earthquakes， the potential safety hazards of fine-grained and high-stacked tailings
more prominent. A series of dynamic triaxial tests of cyclic spherical stress and cyclic deviatoric stress was
carried out to explore the influence of seismic loads on the dynamic properties of saturated silt tail，simulat⁃
ing the complex stress conditions caused by seismic loads. The test results show that： Under pure cyclic
spherical stress， the accumulated pore pressure generated by saturated tailing silt is not enough to cause
damage to the sample；Compared with pure cyclic deviatoric stress，the coupling of cyclic spherical-devia⁃
toric stress can inhibit the development of cumulative pore pressure and cumulative plastic strain. Mean⁃
while，through the analysis of the test results，an empirical growth model of pore pressure coupling for sat⁃
urated tailings under high-stress conditions is established. And the coupling mechanism of cyclic spheri⁃
cal-deviatoric stress is revealed from the effective stress path、particle breakage and plastic strain mecha⁃
nism. These studies can provide a sure reference for the seismic research of fine-grained and high-stacked
tailings dam in china.
Keywords：high stress；cyclic spherical stress；cyclic deviatoric stress；coupling effect；tailing sand

（责任编辑：耿庆斋）

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