锚喷支护条件下膨胀岩巷道稳定性研究

采用侧限膨胀率试验对某钼矿矿岩的膨胀特性进行研究，分析了膨胀岩巷道易膨胀变形的原因，基于莫尔-库伦强度准则对轴对称膨胀岩圆巷进行弹塑性分析，提出湿喷+树脂锚杆+钢拱架支护手段，并对巷道收敛变形及周边围岩移动进行监测。研究结果表明:支护力p₁越小，膨胀力σ_s越大，则塑性区半径R₀越大，膨胀岩巷道越不稳定；湿喷+树脂锚杆+钢拱架支护能有效控制膨胀岩巷道变形并大幅降低支护成本。研究成果为同类或相近条件下的膨胀岩巷道支护设计提供了依据。

Research on the Swelling Rock Roadway Stability under the Condition of Bolt-shotcrete Support

In order to analyze the reason of swelling rock roadway deformation,the expansion characteristics of the ore-rock in a molybdenum mine is analyzed by adopting the confining expansion rate test.Based on the Mohr-coulomb strength criterion,the axisymmetric swelling rock roadway elastic-plastic characteristics is analyzed,and the wet shotcrete+resin anchoring bolt+steel arch support method is proposed,besides that,the convergence deformation and surrounding rock movement are monitored.The study results show that the smaller of supporting force and the greater of expansion force,the greater of radius of plastic zone and the instability of swelling rock roadway;wet shotcrete + resin anchoring bolt+steel arch coupling support can effectively control the rock deformation and dramatically reduce support costs.The study results of the paper can provide the basis for the same or similar mine.