Author(s): DU Yan-qiang, YANG Chun-he, WU Shang-wei, State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University
Pages: 583-588
Year: 2016 Issue:  4
Journal: Journal of Northeastern University(Natural Science)
Keyword:  tailings silt; pore-water pressure; model; cyclic loading; dynamic triaxial test;
Abstract: A GDS dynamic triaxial testing system was used for cyclic loading test to study porewater pressure behaviors in tailings silt. Cyclic stress was applied to liquefy the tailings silt. The influences of relative density and confining pressure on pore-water pressure in tailings silt were studied. The results showed that the development of pore-water pressure can be divided into four stages,namely rapidly growing stage,stabilized-increasing stage,structural failure stage and fully liquefied stage. The increase of confining pressure and relative density can strengthen the capacity of anti-liquefaction. The result of lab tests on tailings silt was compared with that on sand,it showed that the characteristic of dynamic pore-water pressure for tailings silt is different from that of sand,and it can be described with a double-S model which has a very good application in both tailings silt and sand.