The reason is the volume breaking of rock ridge in the course of work.

Research on high pressure curtain grouting technology in shallow broken rockmass;

Experiment and research on rapid and successful drilling in broken rock of No.2 deformation body of Laxiwa hydropower project;

In fields of coal mining,geotechnical engineering,the flow in broken rock is nonlinear,instable and time-varying for seepage parameters.

In the light of the fragmentized coal body in 2315 comprehensive mechanical coal mining face of Chengzhuang Coal Mine, this paper applies the grouting solidifying technology with Malisan N to solve successfully the difficulties existing in the ceiling management in the stoping process.

In the light of the hidden dangers existing in the back production of comprehensive mechanized coal mining face, this paper advances the scheme of reinforcing the fragmentized coal body around the geological structure to assure the smooth completion of the back production of coal mining face.

Study on the laws of gas flow in over-broken rock mass;

Nonlinear dynamic analysis on non-Darcy seepage in over-broken rock mass;