Research of Indoor Reduced Scale Model Test for Negative Friction of Pile Group

The target of this paper is to research the change law of the negative friction for after soaking. The negative friction of pile group is measured through the indoor reduced scale model test in loess area. The similarity ratio design, the groove design of the model, the selection of test materials, the design of the ground soil, the layout of measuring point and the research of load method are involved in this test. Through the study on the reduced scale model, it will have a deeper understanding to the mechanism of pile side negative frictional resistance.It also can guide the design and practice of other engineering.