Composite active control system of roof and side truss cable for large section coal roadway in fold coal pillar area

• Published in: Journal of coal science & engineering, China Vol. 19; no. 2; pp. 126 - 132
• Main Authors: Xie, Sheng-Rong, Li, Er-Peng, He, Fu-Lian, Zhang, Shou-Bao, Zhang, Guang-Chao, Pang, Mao-Yu
• Format: Journal Article
• Language: English
• Published: Heidelberg China Coal Society 01.06.2013
• Subjects: Earth and Environmental Science; Earth Sciences; Geochemistry; Geology; Geophysics/Geodesy; Geotechnical Engineering & Applied Earth Sciences; Mechanical Engineering; 主动控制系统; 复合; 大断面煤巷; 斜屋顶; 桁架; 煤柱; 结构力学模型; 锚索; fold coal pillar area; structural mechanics model; coal-side cable-channel steel; increase span mechanism; roof inclined truss cable system
• ISSN: 1006-9097; 1866-6566
• DOI: 10.1007/s12404-013-0203-7

In order to solve the surrounding rock control problem of large section gangue replacement roadway under complicated conditions, this paper analyzed the impact to the roadway controlling produced by the geological conditions such as high ground stress, folded structure tilted roof asymmetry and soft wall rock, and built the tilt layered roof structural mechanics model to clarify the increase span mechanism of the weak coal instability. Then, we proposed the combined control system including roof inclined truss cable, coal-side cable-channel steel and intensive bolt support. And then by building the structural mechanics model of roof inclined truss cable system, the support principle was described. Besides, according to this model, we deduced the calculation formula of cable anchoring force and its tensile stress. Finally surrounding rock control technology of large section roadway in fold coal pillar area was formed. Field practice shows that the greatest roof convergence of gangue replacement roadway is 158 mm and coal-side deformation is 243 mm. Roadway deformation is controlled effectively and technical support is provided for replacement mining.