Discussing on the consolidation deformation and microstructures of the surface soil layer in Tianjin;

In order to ascertain a reasonable strip mining project for the coal mining under villages with thin bedrocks under the thick alluvium in Linhuan, the characters of surface subsidence in strip mining were studied by numerical simulation method based on discrete element.

Thickness,compactness and grain composition of top soil layer were tested along sections across west Hailar,HulunBuir sandy grassland to determine how blowouts are controlled by microrelief and top soil layer.

Numerical calculation and experimental study of drilling shaft bottom in special thick alluvium;

Aiming at the status,that there is not theory reference for project determination of shaft line freezing in deep alluvium,in the paper a method which combines the finite element numerical simulation with multi-target gray situation decision-making was brought forward,in order to optimize project determination of deep shaft line freezing.