Based on the analysis of the deformation and failure mechanism of the soft rock chambers,a combined reinforced technology with the grouting and anchors.

Study on Stability of Drilling Chamber in Large Diameter Longhole Mining;

As an example,the drilling chamber stability of deep mining stope was evaluated,where mining method are testing in Tongling Dongguash.

This paper introduces the supporting technique of high-speed load-bearing pre- stressed cable anchor used to extra large coal-rock chamber,describes the selection of support pattern,support parameters and construction method based on the prac- tical conditions;and also makes a thorough study on the results of strata control ob- servations.

Determination of plastic zone of caverns by tracing algorithm;

This paper puts forward the reasonable optional method of timbering parameter for big section room construction,as well as the items should be noticed and the problems should be solved first in construction course.

Through analysis to weak coalbed and harmfulness to roadway,main haulage roadway and room supporting design and adaptability condition are discussed in weak coalbed.

According to service rife of room and feature of surrounding rock,pressure situation of room was analyzed,supporting parameter was counted on the basis of combined arch theroy.

Back-analysis of mechanics parameters of surrounding rock of cave;

Unified solution of elastic-plastic analysis for surrounding rock mass stress under cave deformation;