The grouting and consolidating technique on foundation over Baijing mined-out areas;

Based on research of rules of roof movement when coal seams of low permeability are extracted, Tiefa mining area undertook the first technical demonstration project supported by UNDP of drilling surface vertical gob wells in 1994.

Discussion of the Pressure Grouting technology in the Mining-Collapse-Area Control of Road Engineer;

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;