From the views of meeting boundary conditions, smooth symmetry and convex of yield strength surface under three-dimensional principal stress space, eight different smooth ridge models which are used ingeotecnnical engineering field are commented in detail, and corresponding advanteges and disadvantages of every smooth ridge model are discussed systematically.

The lightweight aggregate concrete four parameter unified intensity destruction criterion,which considers flow plasticity of LWA under high compressive stress is established by the smooth ridge model of double shears unified.

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.