The 110902#roadway of Renjiazhuang Coal Mine uses coal-rock interaction composite roof.Ac-cording to the actual geological occurrence conditions and the measured stress value of the roadway,the UDEC model design was carried out,and the roadway displacement calculation step model was established.It is concluded that if the stress release value R is 1.0,obvious cracks appear in the top coal and extend to the deep seam and the two sides of the roadway.In the case of a stress release value R=1.0,bolts with lengths of 1.0m,2.0m and 3.0m were respectively used for simulation,which revealed that as the bolt length increased from 1.0m to a reasonable length,the relaxation zone of the surrounding rock gradually decreased,the number of cracks reduced significantly,and the crack depth was controlled within the anchorage zone.Based on the support technology for coal-rock interaction composite roof,the 110902#roadway bolt length was determined to be 2.4m,and the 110902#roadway supporting scheme was redesigned.The cross point monitoring results show that the roadway support ring restrains the deformation of roadway surrounding rocks.The section size can fully meet the requirements for safe production and use.
关键词
复合顶板/运算步数/锚杆/支护方案/十字布点
Key words
Composite Roof/Operation Steps/Bolt/Supporting Scheme/Cross Point
维普
万方数据