Based on recovery of surface spri ng water after stop flow for 10 years above goaf of 2619,2617 working faces on second l evel of Zhaigou mine field of Xiyu coal mine ,research completely and deeply on the mech anism of spring water recovery,and held tha t recovery of spring water caused by ash mor tar water of fine coal in Shichagou overflo w to the surface along original exit of spri ng water.

The relation between district raise in the multiple coal seams and its pillars;

Simulation on spontaneous fire source distribution in goaf with multi air leakage channels;

Technology of surface boreholes for drainage of goaf gases and application in Tiefa Mining area;

Fuzzy comprehensive evaluation on the spontaneous combustion in goaf and its application;

Research on prospecting effect for gob area of coal mines;

Congregation analysis of coalbed methane in gob area based on GIS;

Analysis of the effect by using TEM detecting water filled gob area in No.2 Mine,Yangquan Mine Group;