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岩层被不同的结构面切割,在进行隧道开挖时,临空面与结构面组合,可形成不稳定结构体,使岩块变得可动。该文应用基于块体理论开发的Unwedge程序,较好地预测了某水工隧道围岩块体的稳定性,为隧道的开挖提供了建议。通过对影响隧道围岩稳定性因素的敏感性分析,得出在众多因素中,结构面内摩擦角、粘聚力及地下水位的影响较大;此外还得出了隧道轴线走向、倾角与隧道围岩稳定性关系曲线图,对隧道选线具有实际指导意义。
Rock strata are cut by different structural planes. When tunnel excavation is carried out, the temporary ground plane and the structural plane are combined to form an unstable structure so that the rock block becomes movable. In this paper, the Unwedge program based on block theory is applied to predict the stability of surrounding rock block of a hydraulic tunnel well and provide suggestions for tunnel excavation. Through the sensitivity analysis of the factors affecting the stability of the surrounding rock of the tunnel, it is concluded that the influence of the friction angle, cohesion and groundwater level in the structure plane is large among many factors. In addition, the tunnel axis direction, dip angle and tunnel Surrounding rock stability curve, practical guidance for the selection of the tunnel.