According to the characteristics and distribution of earth fissure in a high-rise residential building district,the DX extruding-expanding multi-brace-disk pile is used in the high-rise apartment in the upper plate of the earth fissure,so the problem that the usage of long pile is not permissible.

Analysis on deformation characteristic of squeezed branch and plate pile under lateral load with finite element method;

The squeezed branch and plate pile is a type of special figure pile.

3D finite element analysis of pile-soil interaction of squeezed branch pile;

Finite element analysis on horizontal load performance of squeezed branch pile;

Forecasting ultimate bearing capacity of single squeezed branch pile by hyperbola method;

We designed the shaking table test of squeezed-branch piles-soil-structure dynamic interaction system.

Experimental investigation and design analysis of vertically loaded cast-in-situ pile with expanded branches and plates;

Based on the results of static loading tests and measurements of body resistance and bottom resistance of six piles, the load bearing capacity and deformation behavior of vertically loaded cast-in-situ piles with expanded branches and plates are analyzed, and several pieces of instructive conclusion are given.

Referring to the current study of cast-in-situ piles with expanded branches and plates and methods of pile foundation analysis, the paper makes a thorough research on the bearing and deformation behavior of vertically loaded piles with expanded branches and plates.