Concrete shaft lining deformation monitoring in thick alluvium region and grey model forecast;

Study on variation of vertical additional force on shaft lining by simulation tests;

Fuzzy integrative evaluation of shaft lining under complicated loads in thick alluvium;

Dynamic simulation of the contact between drill stem and well wall;

Many factors can influence stability of well wall in the area of petroleum drilling engineering.

This paper is aimed to study the forecast method for shaft wall rupture.

Analysed the reasons for auxiliary shaft wall broken under construction of Qinan Mine auxiliary shaft.

By using high-pressure direct shear apparatus and triaxial electro-hydraulic servocontrolled testing system, as well as soil-concrete samples contained an interface modeling the contact surface between soil and shaft wall, the mechanical parameters of interaction between clay or sand soil and shaft wall sunk by the freeze method at great depth have been measured.

Investigation of shaft well failure mechanism through structure analysis;

On the injecting strengthen thick surface soil methods managing the crack of shaft sidewall;

Damage form research of shaft sidewall under local load

A sidewall stability is is a significant subject in drilling engineering .