采矿与安全工程学报Issue(5)：702-708,7.
深埋薄基岩大跨度切眼顶板失稳垮落规律
Research on the law of instability and caving for large-span cut-hole roof with thin bedrock in depth
摘要
Abstract
In order to obtain the law of instability and caving for large-span cut-hole roof with thin bedrock in depth during mining, the cut-hole of 1105 great mining height face in Zhaogu No. 2 Coal Mine has been taken for research background. Separate type displacement monitoring instrument of deep roof and separate type bolt (cable) condition monitoring instrument, whose sensors were arranged in goaf and secondary instruments were moved outside, have been adopted for the first time to re-al-timely monitor the deformation and failure laws of cut-hole roof and dynamic changes of bolt (cable) supporting force during mining. The mechanical model of breakdown destabilization of large-span cut-hole roof has been constructed and the mechanical mechanism of instability and the mechanism of caving of roof has been expounded. The results indicate that the instability and caving form of cut-hole roof is manifested as instantaneous fractures of high-horizon roof in twice. Instability and caving hori-zon of roof is over 6 m. After the completion of the first fracture, the roof will form hinge structures with certain self-stability. With continues propulsion of coal face, the secondary fracture occurs and then the roof completely collapses. The deformation rate can reach 5.3-19.4 mm/min during the first roof fracture. Accompanied by anchorage invalidation of the bolt, deformation rate is relatively small during the secondary fracture, which is about 2.6-7.2 mm/min.关键词
大跨度切眼/薄基岩顶板/失稳垮落/跨距Key words
large-span cut-hole/thin bedrock roof/instability and caving/span分类
矿业与冶金引用本文复制引用
贾后省,马念杰,赵希栋,张胜凯..深埋薄基岩大跨度切眼顶板失稳垮落规律[J].采矿与安全工程学报,2014,(5):702-708,7.基金项目
国家自然科学基金项目(51234005，51134018，51204187) （51234005，51134018，51204187）
