Research on principle of roof stability of abandoned workings and supporting technology;

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

Analysis on shearing deformation of bolt in sidewall of gob-side entry for fully mechanized top coal caving mining face;

Coupling support technology for gob-side entry at depth in Nantun Coal Mine;

Aimed at the severe deformation of surrounding rock of gob-side entry on insular face or the unstable of small coal pillar induced by dynamic pressure in mining,the stability of the gob-side entry with small coal pillar on insular face was studied by numerical calculation,physical simulation experiment and in-situ test.

This paper introduces the performance of Marison and the crafts and technological parameter of using the chemical starch injection technology to consolidate the coal pillars in coal gates close to gob and shows that using Marison consolidation technology not only has a simple construction process but also is safe and defendable,fast and efficient,and has broad application prospects.

It has great supporting pressure and good plastic deformation, so it can efficiently support an old roadway, descend the load a.