The study of influence of the crossbeam and corner prop on shear-lag in the thin-wall curve box beams;

The influence of the crossbeam and the corner has been explored in the beeline box beams which have different width-to-span ratio.

Gas accumulation automatic monitoring-processing method on upper corner of fully mechanized coal mining face;

The study on the Numerical Simulation and determination of parameters in gas control at the upper corner in U-Type ventilation face;

Study on low-concentration methane disposal at upper corner based on PSA

The effective and feasible fuction of gas auumulation mining face top corner are improved.

Aimed at top corner gas management at the low gas blasting face,by upper goaf drainage with decompression in self coal seam,the experience is tried,the effect is obvious.

Aim at the problem of top corner gas big at work face,seriously influences safety and restrains production,the method of direct drawing top corner gas has been proved sucessful.

In order to improve the recovery rate of resources in the mining areas,solve the problem of excessive Corner Cape gas,this paper introduces the method to realize the mining technology without pillar left in the fully mechanized top coal caving face by taking effective measures to retain the transport lane of the previous working face as the ventilation lane of the next one.