decentralization, superiors vs.

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

Analysis on the damage zone of overlying strata and safety layer distance on the upward mining above the longwall goaf

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.

Starting from the sources of the damp, the movement of the damp and the moving parameter, this paper indicates that the upper neighboring coal seam is the main source of the damp of the stope, and points out that gas extracting and discharging is the basic measure for treating the damp.

Underground coal seam mining,stope roof caving,overburden subsidence,destruction and even surface settlement is a entire process,a unified system.

The casing deformation caused by sand production of unconsolidated sandstones and caving of the overburden is studied .

This paper analyzed the features in base geology and petroleum geology of upsalt zones in Caspian seashore basin,in which there exist distinct differences among different parts of the basin in stratigraphic,structural and petroleum geologic features.

New application of upward slicing and filling by tailing in Chuang-Shang Gold Mine;