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;

Numerical simulation method for mined-out area group stability based on Cavity Monitoring System;

Practice of ventilation with underground mined-out area;

Experimental study on strength characteristics of tailings cement backfilling at deep-seated mined-out area;

Study on spontaneous combustion in Gob of fully mechanized mining with top coal caving face;

Simulation of earthquake action to gob collapse with UDEC;

Technique on pressure releasing gas drainage near gob in xiayukou mine;

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;

Experimental Research on Gas Drainage at Baode Mine Goaf

Stability evaluation of mine goaf with multi-coal seams and complex landform

Stability evaluation of constructing large-scale building-toft above mine goaf;

Roof falling of mined out area was numericauy studied by using a rock failure process analysis software(RFPA2D).

Spontaneous combustion is easily to take place in mined out area of fully mechanized top coal caving workface.

Influence of different lithology of roof,floor,and pillar on the failure process of mined out area was numerically studied by using a rock failure process analysis software(RFPA~(2D)).