高应力泥岩顶板巷道围岩失稳特征及控制分析  

Analysis of instability characteristics of surrounding rocks in mudstone roof gateway subjected to high stress and its control

作　　者：辛亚军[1,2] 穆利斌 

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454000 [2]煤炭安全生产河南省协同创新中心,河南焦作454000 [3]河南焦煤能源有限公司古汉山矿,河南焦作454300

出　　处：《采矿与安全工程学报》2017年第3期519-526,共8页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51174078);河南省教育厅科学技术研究重点项目(14B440001);河南理工大学博士基金项目(B2014-054)

摘　　要：通过对高应力泥岩顶板回采巷道破坏特征、力学变形机制及失稳原因分析,建立了回采巷道锚杆-锚索支护区变形协调方程,提出了高应力泥岩顶板回采巷道围岩控制关键技术,确定了预留断面高强预应力锚杆-锚索协调变形支护方案,并对设计方案进行了数值计算与工业性试验。结果表明:高应力泥岩顶板巷道表现为顶板破碎严重及离层量大、两帮呈非对称收敛变形与底鼓量大的特征;高应力及泥岩顶板软弱围岩是巷道围岩产生破坏的内在原因,锚杆-锚索支护强度过低及锚杆-锚索支护区非协调变形则是巷道围岩破坏失稳的外在原因;古汉山矿13051回采巷道围岩为高应力-节理化-膨胀性复合型(HJS)软岩,为Ⅰ_(AB)Ⅱ_(AB)Ⅲ_(ABD)复合型力学变形机制,采用设计支护方案后,巷道围岩变形能利于释放,围岩压力减小,锚杆-锚索受力均匀,巷道围岩变形保持在可控范围内,预留断面高强预应力锚杆-锚索协调变形支护利于巷道围岩稳定。Through the analysis of failure characteristics, mechanical deformation mechanism and in- stability causes of high-stress mudstone roof gateway, the bolt-cable coordination deformation equation in gateway support area was established, the key technology of controlling surrounding rocks in high- stress mudstone roof gateway was proposed, the support scheme of reservation section and high-strength pre-stressed bolt-cable coordination deformation was determined, and the numerical calculation and in- dustrial test were carried out. The results have shown that high-stress mudstone roof gateway takes the characteristics of serious breaking and bed separation in roof, asymmetric shrinkage deformation in two sides and larger floor heave; internal causes of surrounding rock failure were high stress and weak mud- stone roof, and external causes of instability were lower bolt-cable support strength and uncoordinateddeformation in bolt-cable support area. Surrounding rock of gateway 13051 in Guhanshan Mine was weak rock with high-stress fractured expansion, a composite mechanical deformation of I AB II AB III ABD. After the application of design scheme, deformation energy of the surrounding rocks in the gateway was released easily, surrounding rock stress decreased, bolt-cable was stressed uniformly, surrounding rock deformation was kept within controllable range, and the support scheme of reservation section and high-strength pre-stressed bolt-cable coordination deformation was beneficial to gateway stability.

关 键 词：高应力 泥岩顶板 回采巷道 锚杆-锚索 协调变形方程 稳定性 

分 类 号：TD353[矿业工程—矿井建设]