This paper raises out rock control principle in maintaining entries along gob edges of sub-level caving mining and bolt support,it is applied to engineering practice and technical and economic results are gained.

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.

Research on the suitable support form of deep gob-side entry in fully mechanized top coal caving mining

Thus the intensity of surrounding rock in crushing and plastic zone of the gob-side entry subject to dynamic pressure is enhanced,and the distortion of the gob-side entry sub.

The mechanism and control of floor Heave of road driving along next goaf of high seam;

Postion analysis of road driving along next goaf under given deformation of the main roof in sublevel caving face;