Based on principle of correcting method of subgrade-stress relieving and deformation mechanism of soft soil, a nonlinear elastic-viscoelastic rheological constitutive model of soil is proposed.

Numerical immitation of building rectifaction by stress relief;

A linear elastic model for the determination of the 3D rock stress tensor,based on a special method for stress relief on the local surfaces of a drilled borehole wall,is researched.

By contrasting the productions of stress relief to hydraulic pressure split measurement,this paper also analyzes the rock burst probability in project period so as to provide parameter for optimized design.

To study the relation between stresses and rock burst during tunnel excavation at Jinping Ⅱ hydro-power station, 3D in-situ stress measurements are carried out by hydraulic fracturing and over-coring from 130 m to 3 005 m along tunnel.

Several rectification methods,including stress relaxation method,additional stress method and ground stiffness softening method,were combining together.

Simulation of building rectification by stress relief method;

For determining the state of ground stress in the deep mining, the determination of ground stress has been carried out The stress relief method and the triaxiai strain gauge have been used.

An indoor experiment is conducted for rectifying a reduced-scale model of leaned structure on collapsible loess using a synthetic forced settlement method,which integrates stress relief method,additional stress method and ground stiffness softening method according to the properties of collapsible loess.