(1.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu，Sichuan，610059，China；2. College of Environment and Civil Engineering，Chengdu University of Technology，Chengdu，Sichuan，610059，China)
Abstract：In order to study the energy dissipation characteristics of micro steel tube pile-soil composite anti slide structure (hereinafter referred to as pile-soil composite structure) under earthquake action，a quasi-static direct shear test device for the soil-pile composite structure is designed，and three models of pile-soil composite structure with the same pile spacing and different pile diameters are tested under cyclic loading. The bearing capacity，hysteretic performance，stiffness degradation，ductility and energy dissipation capacity of the test models are compared and analyzed. The results show that the pile-soil composite structure can work together under low cyclic reciprocating load. When the distance between piles is about 10 times of the pile diameter，the pile-soil composite structure has better energy dissipation capacity. However，the energy dissipation capacity of the pile-soil composite structure decreases obviously when the ratio of the pile spacing to the pile diameter is less than 5.9. The model with a smaller pile diameter is closer in bearing capacity，hysteretic performance and energy dissipation capacity，and the hysteretic curve is fuller. When the pile diameter is large，the bearing capacity，hysteretic performance and energy dissipation capacity of the model decrease obviously.
2020, Vol. 39 
