Mutual reinforcement support technology with bolt and steel frame of ultra soft thick seam gateway

In order to solve the serious deformation prohlem of the gateway,a surround rock creep deformation and failure analysis method of the mine gateway was a pplied to the test on the side pressure coefficient relationship of the gateway surrounding rock. The paper analyzed the function mechanism of the ultra high drawing force f rom the bolt in the extreme soft thick seam. The high drawing force could be very favorable to control the deformation of the gateway surrounding rock. Thus the mutual rei nforcement technology of the bolt anchoring and frame support was provided. The results showed that a support method with a U type frame support and bolt combined fun ction would not only improve the anti bending capacity of the U steel frame support,but also could improve the stability of the gateway sidewalls and the stability of the floor and the stability of the gateway sidewall and floor. Thus the completed stability of the gateway was enhanced. A final convergence rate between the mine roof and floor of t he gateway was 0. 021 mm 1 d,the convergence rate of the two sidewalls along the gateway was 0.01 mm/ d and the technology support role of the gateway in the extrem e soft and thick seam was effective.