由于开挖引起应力场的转移造成边界矿体应力集中,开挖难度大。采用RFPA2D模拟软件,研究毛坪铅锌矿3m×3m矩形断面进路和3m×5m×5m六角形断面进路在矿岩接触处高应力区的进路顶板及矿柱的破坏分析。同时,选取矿岩接触处的进路建立数值模拟模型,采用RFPA标准模式中的侧压压缩进行加载,得出矩形断面最大能承受水平应力为1 MPa,六角形断面为0.6 MPa。
Stress of boundary ore bodies is concentrated because of stress filed transfer that is induced by excava-tion ,making excavation difficult. The paper uses RFPA2D simulation software to analyze the damage to drift roof and ore pillar in the high-stress area that is the contact zone of ore and rock of the 3 m × 3 m rectangular cross-section ap-proach and the 3 m × 5 m × 5 m hexagon cross-section approach. At the same time,numerical simulation model is es-tablished using approaches in the contact zone of ore and rock and is loaded with lateral compression from RFPA standard mode. The results show that the maximum bearable horizontal stress is 1 MPa for rectangular cross section and 0. 6 MPa for hexagon cross section.
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