In order to analyze the soil structure and to use the result to analyze the performance of grounding grids in substation, this paper presents a self adaptation sampling scheme when complex image method is used to approach Green s function in multi-layer soil.

By numerous calculations about grounding network in multi-layer soils with given suitable condition for simplification of soil model,and carrying out combined analysis about the grounding system design,the conclusion obtained was coincided with that concluded from simulation experiment in the laboratory.

Using the method of integral transform, semi-analytical solution for the response of a pile in multi-layered soil is developed taking visco-elastic supporting at the tip of pile into account.

A new method of calculating soil pressure diagram for multi-layered soil excavation with finite surcharge is presented and the results are compared with those of the trapezoid soil pressure di.