Discussion on rational size of district sublevel coal pillars in coal mining face with shallow mining depth;

According to the mining features of the shallow mining depth,longwall and hard over strata in the P1 first coal mining face of Balamb Mine,India,with the analysis on the mine strata pressure features and the analysis on the UDEC numerical simulation calculation,a mine strata pressure control technology with a surface ground blasting method was provided for the P1 coal mining face.

6-2 seam under the shallow mining depth conditions and discussed the suitability of the fully mechanized top coal caving mining and fully mechanized high cutting mining under the above conditions.

Research conclusions:Based on the research on the ground cracks and surrounding rock pressure during the excavation of loess tunnel,the dividing line of deep and shallow submersion,computing method of surrounding rock pressure and designing principle of secondary lining of large sectional loess tunnel on Zhengzhou-Xi\'an Passenger Dedicated Line are presented.

Construction technique for opening section of shallow buried water conveyance tunnel;

Scattering of SH-wave by a shallow buried elliptic cylindrical cavity and dynamic stress concentration;

The first weighting procedure of shallow buried face under thin bedrock may be divided into 3 phrases: lower strata caving,key strata and its upper strata's damage and caving,lagged caving of loose strata.

A Brief Introduction to Design &. Construction of Shihuang Tunnel with Shallow Overburden;

Based on the principle of New Austria Tunneling Method,the Cross Diaphragm Method is usually selected to construct big-span shallow overburden highway tunnel.

In this paper,with the rectangle tunnel construction in the foreland soft rock with shallow overburden,FLAC is adopted to simulate the excavation of tunnel using partial excavation method,The mechanism of large deformation process of rectangular tunnel primary support is studied.