Pore-water in saturated soil gains both way drainages in radial directions by installing annular sand-layered drainages into the soft soil ground,and then the excess pore-water pressure can be dissipated along the two lateral surfaces of every annular soil layer.

Based on modal perturbation method, a new approach is developed for solving the random seismic response of horizontal layered soil.

Analytical solution of contaminant diffusion through multi-layered soils;

One dimensional consolidation analysis of layered soils with impeded boundaries;

Field experimental study of infiltration capacity of layer soil;

Calculative method of mechanical admittance curve and its preliminary application for multi-defective piles in layered soil;

Infiltration mechanism of layered soil and its simulation model;

A solution to the torsional response of a multi defective pile in layered soil is presented,when subjected to an impact torque at pile top.

In this paper, based on the method of elastical foundation reaction, the analyses of the non-lined interaction of laterally loaded piles with non-unitary stiffness and multilayed soils with reaction coefficient varying along the depth were made using step′s loading method.