金川深部高应力巷道锚喷支护设计与数值模拟技术

Design and numerical simulation of rock bolting and shotcrete for deep tunnels with high stress in Jinchuan Mine

摘要: 针对金川深部高应力巷道变形特征,首次提出了以预应力锚索为支护手段的综合控制技术,为预测支护效果和支护参数优化,进行了高应力挤压碎裂蠕变围岩的锚喷支护巷道稳定性数值分析研究。首先给出了综合控制技术中的两次支护型式和参数;然后,考虑巷道围岩的碎裂蠕变特性,研究采用了分段线性软化模型和剪胀特性参数,并探索提出了锚固体支护强度指标,定量考虑锚固围岩的强度效应;最后,采用提出的计算模型和分析方法,进行了1178m分段道数值模拟和参数优化,取得了较好的分析效果。

Abstract: Considering the deformation characteristics of deep tunnels with high stress in Jinchuan Mine,a synthetic controlling technology composed of pre-stressed cables was put forward.In order to forecast supporting effect and parameter optimization,numerical simulation technology was studied and executed for rock bolting and shotcrete tunnels with high stress and jointed creeping rock masses.Two supporting types and their parameters were given first.Then subsectional softening model and parameter of dilatancy were adopted based on crash creep characteristics of joined rock masses and supporting strength index of anchorage body were put forward.Finally,1178 subsections of tunnels with high stress were analyzed and evaluated with the above-mentioned numerical method and technology,and parameters were optimized.