Damage height of overburden rock over anti-sand & anti-collapse coal pillar in outcrop zone under condition of full-mechanized top-coal caving;

The rock property and combined features of the overburden rock would determinate the strength and weak of the developing height of the falling zone and water conducted fissure zone and the water isolation of seam.

Dynamic modeling for movement behavior of mined overlying strata using discontinuous deformation analysis method;

The research on the laws of the overlying strata destruction is the foundationof the reasonable determination of the mining boundary, and is the key of theproduction safety of mining under the water bearing stratum.

It is very difficult for theoretical analysis and field observation since the movement and bed separation characteristics of overburden strata above mine voids induced by underground mining is a very complicated problem, which influenced by many factors, and the deformation and movement of overlying strata are not visible and touchable.

Application of Laminar Layer Element in Simulation of Overburden Delamination;

In the course of retribution, displacement and deformation in the overburden takes place with the working face advancing.

Analysis on the mechanism of the face-contacted blocks structure in overlying strata above the longwall face;

Based on the experiment with similar material,the laws of the extra subsidence on the surface and the stress vary inside overlying strata by newly increased load on the surface above worked-out area formed by fully mined and partial mined were researched.

Directed at complete study on the law of the overlying strata and the characteristics of stress distribution on mining in steeply dipping seams,this paper is focused on research on the law of overlying strata and the stress variation characteristics by simulating the exploitation of the fully mechanized coal mining face in steeply dipping seam of Xinzhuangzi mine.

Research on overburden strata failure case after mining operation in S mining area;

Application and research on comprehensive Geophysical detection technology to strata failure;