托顶煤巷道锚固“梁-拱”结构分类及顶板冲击失稳机制  

Classification and instability mechanism of anchored“beam-arch”composite struc-ture in rock burst roadways with top-coal

作　　者：曹安业[1,3] 郭文豪 温颖远[1,2] 王崧玮 刘耀琪 郝琪 吕国伟 李庚 CAO Anye;GUO Wenhao;WEN Yingyuan;WANG Songwei;LIU Yaoqi;HAO Qi;LÜGuowei;LI Geng(School of Mines,China University of Mining&Technology,Xuzhou 221116,China;School of Geology and Mining Engineering,Xinjiang University,Urumqi830046,China;Jiangsu Engineering Laboratory of Mine Earthquake Monitoring and Prevention,China University of Mining&Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221116 [2]新疆大学地质与矿业工程学院,新疆乌鲁木齐830046 [3]中国矿业大学江苏省矿山地震监测工程实验室,江苏徐州221116

出　　处：《煤炭学报》2024年第4期1752-1770,共19页Journal of China Coal Society

基　　金：江苏省创新支撑计划国际科技合作/港澳台科技合作-重点国别产业技术研发合作资助项目(BZ2023050);国家自然科学基金资助项目(52274098);新疆维族自治区重点研发任务专项资助项目(2022B01034)。

摘　　要：我国煤矿托顶煤巷道冲击地压频发,且冲击动载下顶板灾害尤为严重。为探究托顶煤巷道顶板锚固结构类型和冲击失稳机制,以陕西某矿301工作面回风巷道大面积冲击垮顶为工程背景,运用相似实验、理论分析及数据统计等方法,分析了托顶煤巷道围岩应力、位移和巷表加速度的动载响应特征,研究了顶煤厚度与支护构件影响下顶板锚固结构的分类特征,探究了弹性波下托顶煤巷道的应力响应机制,提出顶板锚固“梁-拱”结构的冲击失稳机制,评估了301工作面回风巷道的抗冲能力,并提出了相应的抗冲支护优化方案。结果表明:①冲击动载下托顶煤围岩应力和位移等监测数据验证了顶板存在内、外层的梁或拱形锚固结构,因顶煤厚度增加,顶板内层锚固结构存在由“梁”向“拱”的转换;②基于顶煤厚度与支护构件相对关系,将顶板锚固结构划分为薄顶煤的“叠加梁-拱”、厚顶煤的“组合梁-拱”和特厚顶煤的“组合拱”,建立了厚煤梁由“梁”向“拱”转化的临界厚度指标;③顶板锚固梁结构和锚固拱结构的冲击失稳机制为动静载荷下分别达到其拉伸、剪切强度极限后破坏,锚固“梁-拱”结构对冲击载荷的放大效应受其尺寸影响明显;④特厚顶煤的“组合拱”结构中内层拱承载强度较低,可增加锚杆长度提升内层拱厚,对应的“组合拱”结构的承载能力上升明显,与抗冲能力评估结果相符。The rock burst frequently occurs in the roadways with top coal,and the roof disasters are particularly severe un-der dynamic stress in China.In order to explore the classification and instability mechanisms of anchoring structures in the roadways with top-coal,analog simulation experiments,theoretical analysis,and data statistics were used under the engin-eering background of the large-area rock burst roof failure in the Working Face 301 of a mine in Shaanxi Province,China.The dynamic load response characteristics of the stress,displacement,and surface acceleration of the surrounding rock in the roadways with top coal were analyzed.The classification characteristics of the roof anchoring structure under the influ-ence of top coal thickness and cables were studied.The stress response mechanism of the roadways with top coal under elastic waves was explored,and the instability mechanism of the anchoring“beam arch”structure was proposed.The rock burst resistance of the air-return roadway in the Working Face 301 was evaluated,and the corresponding optimization schemes for the“beam-arch”composite structure were proposed.The results show that①the monitoring data of stress and displacement of the surrounding rock in the roadways with top coal under dynamic stress verify the existence of in-ternal and external beam or arch anchoring structures in the roof.Due to the increase in the thickness of top coal,there is a transition from“beam”to“arch”in the anchoring structure of the inner layer of the roof;②based on the relative relation-ship between the thickness of the top coal and the cables,the roof anchoring structure is divided into“superimposed-beam and arch”for thin top coal,“composite-beam and arch”for thick top coal,and“combined arch”for extra thick top coal.A critical thickness index for the transformation of thick coal beams from“beam”to“arch”is established;③the instability mechanism of the beam structure and the arch structure is that they fail after reaching their tensile a

关 键 词：锚固“梁-拱”结构 顶煤厚度 载荷放大效应 弹性波 支护优化 

分 类 号：TD324[矿业工程—矿井建设]