Abstract：This paper proposes the pressure relief principle of roof control and the corresponding“three bolting”support technique to solve the problem in supporting coal roadways with high ground pressure，cracked surrounding rock and support difficulty. The practical process of this technique involves two steps in coal roadway excavation. The first step involves the lead-excavation in small section and the only bolting support in time to the roof plate stratum with high strength bolts，but no support to the side coal seam，which allow some deformation and fracture to the side coal seam，and the loosening circle is formed gradually，the high stress in surrounding rock is released. Then the enlargement is carried to the two sides of the coal roadway and the bolting support to the side coal seam and the top of the roof plate is added with high strength bolts in time after the enlargement when the side coal seam appears sloughing. In the second step，the prestressed cable is used as reinforced support to the roof plate，and the reinforcement by bolting and grouting with inside grouting bolt is applied to base angle. As a result，a suit of technique of the pressure relief principle to the roof control and the corresponding“three bolting”support technique is formed. These principle and technique have been applied to the coal roadway support in complex geological structure areas of Taoyang coal mine at Feicheng mining area. After the support practice and observation on rock pressure，satisfactory benefits both in technology and in economy are gained，which provides a new approach in support of the coal roadways under difficult conditions.
