According to the analysis of the mechanism of collapse in tunnels,the paper adopts the strong support promptly,and undertakes some treatment,such as the tunneling with pilot pipes,the small pipe pouring method,the secondly lining strengthening and the backfilling method,and better effect is achieved.

Such measures as weak blasting,strong support,geological prediction and strengthening monitoring and measurement etc.

The increase in mining height makes the weighting of immediate roof become more violently,which requires that the support strength should increase accordingly.

Based on the analysis of the existing support of wangfenggang mine,new support material is adopted in the testing tunnel,strengthening the support strength.

Author illustrates the significance of rational bolt pretension and support strength by studying the factors including the effect of bolt support in roadway and the characteristics of the bolt's material.

In view of deep and complicated roadways in coal mines,the bolting mechanism was analyzed,the high pretensioned stress and intensive supporting theory was put forward.

The key block mechanics analysis of roadways' roof unsteadiness in cranny rock-mass and its supporting strength design;

In view of the problem of deformation and damage in eoalmine roadway surrounded by soft rocks, the reasonable supporting strength is determined by testing study to effectively control roadway deformation in soft rocks.