Analysis on the problems existing in goaf roadway in soft rock area;

The mining technology by areas with retaining roadways along goaf is applied in Baishan Coal Mine.

The retaining roadways along goaf is applied in the left No.

Some aspects were analyzed,such as the function of support in retaining roadways along goaf,mine pressure behavior,support ways,the satisfied requirements,and the existing problems in maintenance.

Research on surrounding rock deformation factors in gob-side entry driving of fully mechanized longwall top coal caving mining face in island seam;

The gob-side entry driving in the fully-mechanized coal winning face can be protected successfully by using the anchored cable and rod supporting system.

In fouth cola mine of Hebi coal power stock company,roadway of neighbouring goaf bear a large pressure,maintenance is very difficult ,it affects safety production,in order to solve this problem,this coal mine co-operates with jiaozuo university of engiveering,combined supporting technology of gob-side entry driving have been studied through test in 2118 2614 workface tood results are gained.

In the paper,in order to solve the problem of difficult supporting large section roadway driving along goaf in deep mine,on the basis of numerical simulation of support effect and mechanism of fortified roadways at their different parts,the concept of floor distortion control in the whole section of large section roadway driving along goaf in deep mine was brought forward.

Study on depressurizing control of the surrounding rock of a roadway along gob area in sub-level caving mining;