Development of high pretensioned and intensive supporting system and its application in coal mine roadways

摘要

In view of the features of complicated and difficult roadways, the present problems on rock bolting technique analyzed, and the high pretensioned and intensive supporting theory put forward. The initial supporting stiffness and strength of bolting system should be increased largely to control the dilatant deformation and maintain the integrity of surrounding rock. The high pretensioned and intensive bolt and cable system developed, and the mechanical properties of the bolting components obviously improved. This system been successfully applied in 1000m deep in Xinwen coal , and entries affected by intense mining activities in Lu'an coal. The deformation of the reduced by a big margin. This system provide an effective supporting form for complicated and difficult roadways.