Through comparing the model of Goodman interface element,Desai thin layer element and element without interface,the deficiency of Goodman interface element is pointed out.

The conventional Goodman element is the most frequently used model in the numerical simulation of structural planes;but there are some difficulties in parameter determination and computing convergence.

Through analyzing the Goodman element in the soil—pile—superstructure interaction, and modifying the Goodman element by adding the damping component, the problem that the Goodman element did not describe the energy dissipation during dynamic interaction was solved.

Based on the finite element software-MARC and user s subroutine of Goodman element,authors analyze the effects of shallow layer saturated loess foundation treated with geocell.

Simulation studies on stability of slope with contact element;

The computing model of adopting contact element to simulate the pile-soil’s reciprocity;

Automatic generation of 3D finite element mesh and contact elements for helical gears;