【摘要】 针对贵州省盘江矿区某矿131运输巷底鼓严重问题,本文通过现场调研、室内试验、理论分析及数值模拟等研究方法,揭示底鼓的变形破坏特点及破坏原因。分析认为底板围岩破碎且处于无支护状态,在高应力作用下发生剪切破坏,水理作用导致底板围岩进一步破碎是底鼓发生的主要原因。基于此提出"三壳"支护理论,分析其底鼓支护机理,构建了"底板浅部注浆锚杆+深部注浆锚索束+灌浆500mm+U型可缩性支架"的"三壳"治理底鼓技术并成功运用。现场监测结果表明:巷道的围岩变形分为三个阶段,20d变形剧烈,20～45d较为缓和,45d以后变形趋于稳定,底鼓量最大95 mm,稳定后变形速率0.35mm/d,变形量在可控范围内,支护效果显著。更多还原

【Abstract】 Aiming at the serious problem of the floor heave of 131 transportation tunnel in a mine of Panjiang mining area,this paper reveals the deformation and failure characteristics of the floor heave and the causes of damage through field research,laboratory test,theoretical analysis and numerical simulation.It is believed that the main cause of the floor heave is the occurrence of shear failure and the further deepening of the hydraulic action under the high stress of the broken rock of the bottom plate and the unsupported state.Based on this,the"triple-shell"support theory is proposed.The mechanism of the floor heave support is analyzed,and the"triple-shell"control floor heave technology of"shallow bottom grouting anchor rod+deep grouting anchor cable+grouting 500 mm+ U type shrinkable bracket"is constructed and successfully applied.The results of on-site monitoring show that the surrounding rock deformation of the roadway is divided into three stages.The 20 ddeformation is severe,and the deformation is more moderate from 20 dto45 d.After 45 d,the deformation area is stable.The maximum floor heave volume is 95 mm,and the deformation rate is 0.35 mm/d after stabilization.Such a deformation amount is within a controllable range,and the support effect is remarkable.更多还原