Hunan Provincial Key Lab of Coal Mine Safety and Mining Technology.Hunan University of Sicence and TechnologySchool of Energy and Safety Engineering,Hunan University of Science and Technology hunan Provincial Key Lab of Rock and Soil Engineering Stable Control and Health Monitoring,Hunan University of Science and Technology

为解决复杂地质条件下高压瓦斯松散不稳定煤岩巷道围岩的大变形与控制等问题,通过现场调研、理论分析、数值计算及工程实践进行研究,根据实际变形情况,发现此类巷道围岩变形特征明显,不易控制,全断面收缩严重;采用岩石力学等力学原理进行了理论分析,认为煤岩体裂隙的扩展增加了煤岩体的渗透性,从而导致围岩强度不断弱化;应用数值模拟手段对有瓦斯压力存在时和无瓦斯压力存在时2种情况下巷道围岩应力卸荷与变形特征进行了分析,表明瓦斯压力越大,围岩变形也越大;最后,进行了锚固支护正交数值方案设计和优化计算,在相关支护原则的基础上提出了以"帮部预应力桁架锚索"为核心的支护技术,现场应用结果表明该技术能提高此类巷道围岩的稳定性。

in order to solv the high deformation and control problens of the surounding rocks along the mine high pressure gas,loose and unstable coal and rockroadway under the condition of the complicated geology.a study was conducted with the site investigaton,theoretical anal ysis numercal alcu ation and engineering practices. Based on the acual deformation condition ,t sthowed tat the surounding rock deformation features of the mine roadwvay were obvious the deformation was harcto be controlld and the fll c.oss sectional onvergence was serious. The rock mechanics and other mechanics pricile were appied to the thecretcal analys. The paper held that the crack expansion ofthe coal and ock masses could inrease the permeatiliy of th coal and rock masses and thus the surounding ock strength wotld be continuously weakened.The numerical simulation means were applied to the analysi on the stress unloading and deformation features of the surounding ock aong the mine roadway with the gas pressure orwith no gas prssure. The higher gas pressure the higher deformation of the mine roadway would be. Fmally a design and optimized calculation were conducted on the orthogonal numercal an of the anchorage suppor. A人dep analysis was conducted on the clculatonresuitsBased othe relevance support principles,based on the pre- stress russ and anchor in the sidevall as the key support techmnodogythe tite aplitcaion resuts shover tha the fehnology would have an important role to improve the stabilty of the mine roadway surrounding rock.

国家自然科学基金资助项目(51574122,51434006)；湖南省教育厅科学研究重点资助项目(14A045)；