Casing failure mechanism and strength design considerations for deep and ultra-deep wells

The falling velocity of the falling body,the acceleration and falling force are calculated The regulation of effect of every related parameter on the falling mation is quiven, providing a reliable basis for the design of the protective device in shaft deepening and safety construction.

A studey of muiti-layer automatic monitoring and its application in deep shaft;

Freeze sinking and ground pre-injecting are used in deep shaft construction.

This paper mainly to the East mouth Zi auxiliary shaft coal mine mechanization supporting rapid construction technology as an example,of large diameter deep shaft rapid construction programme of technical feasibility.

Ground pressure stress of shaft lining in bedrock section of deep vertical shaft and extra deep shaft is revealed by theoretical analysis,which provides a basis for optimized design of shaft lining in bedrock section.

The paper aimed to open out the condition of group rock segment celerity construction, moreover offered theory gist for the scheme of grubbing in the profound stand well.