Comparison and application of high prestress and intensive support system in close, soft and cracked roadway support

Based on the analysis of support effect under original support design at Hongmiao Colliery, the paper summarized the main factors causing the destruction of roadways under neighboring gob areas, and pointed that the low pre-tension of the former support system and the irrationality of auxiliary support components were the main reasons for the failure of roadway support. The high prestress and intensive bolt-cable support system was recommended to reinforce roadways of this type, and the industrial on-site trial had been carried out in the transportation roadway of the Panel One of 5-2(s) Block, located at District 5. The test results showed that such measures as full encapsulation with high pre-tension for bolts and cables and auxiliary components with larger section and high strength could be used to effectively control roadway deformation. They provided an effective approach for the support of roadways under similar conditions.