Self-bearing Capacity for Surrounding Rock of Composite Roof of Coal Roadways and Deformation Control in Deep High Stress Mine
Major engineering problems in deep coal roadway are roof stability control and surrounding rock deformation control. Based on self-bearing capacity of surrounding rock, this paper designs a new roadway cross section, i.e., an inclined wall arch roof section, whose characteris- tics include: (1) It can make full use of self-bearing capacity of surrounding rock to resist confining pressure, based on which, external force is applied to support the roadway; numerical calculation verifies excellent bearing property of the design; (2) Caving that easily occurs while heading along the roof is eliminated by cutting the roof to remove broken and collapsible surroundding rock; thus this improves substantially safety operation; (3) The section is cut into the required shape using a fully-mechanized road header, thus reducing temporary supporting time and increasing heading velocity; (4) Low supporting cost. Especially, the section applies to coal roadways under large ground pressure and weak surrounding rock. Industrial tests are performed in return airway 11111 (a three-soft high stress roadway) of the typical deep mine at Xiezhuang mine in Xinwen coalfield. As is observed, deformation of the section is 1/4-1/6 of roadways heading along the roof under similar conditions, and the roof maintains stable under advanced pressure of the face. This proves that the combination of roadway section design and supporting design can effectively control deformation of surrounding rock in coal roadway with deep high stress and composite roof, and this design can be widely applied under similar engineering conditions.
Deep mine High stress Coal roadway surrounding rock Self-bearing capability Deformation control
CHENG Yunhai JIANG Fuxing KONG Linghai
College of Mining and Safety Engineering, Anhui University of Science and Technology, Huainan 232001 College of Civil and Environmental Engineering, Beijing University of Science & Technology, Beijing
国际会议
2010 International Conference on Mine Hazards Prevention and Control(第二届矿山灾害预防与控制国际学术会议 ICMHPC)
青岛
英文
415-421
2010-10-15（万方平台首次上网日期，不代表论文的发表时间）