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.

Grouting reinforcement design and construction of old roads;

Karst roadbed grouting reinforcement construction technology

In order to make clear the effect of grouting reinforcement of broken rocks,grouting reinforcement test of post-peak rock sample was made and then the sample was tested by adopting cement slurry and Malisan N,respectively.

This paper introduced the two-step coupled grouting method to consolidate the joint,and achieved better results.

Based on similar theory,the deformation properties of-440 pump with high rheological Surrounding Rock are studied by similar material experiment ungrouting and postgrouting at Wannian Coal Mine.

This paper analyses the disease origin in new subgrade of the sixth speeding-up in Jing-Guang Line,proposes the measure of static press grouting in subgrade projects,and introduces in detail the subgrade strengthening plan and construction techniques.