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采用摩尔-库仑弹塑性模型的有限元分析方法和岩体开挖卸荷理论,并考虑地应力对隧洞的作用机制,建立丹巴水电站双洞四机引水隧洞软岩段三维开挖大型三维模型并进行岩体力学计算,分别以不同的掌子面推进深度进行开挖,从洞口开挖至一定深度。统计不同掌子面推进深度下各步开挖不同关键点处的位移变化情况,进行比选,建议工程实际应当选用的最佳掌子面推进深度;在该推进深度下,统计不同洞段不同位置的各向位移预留量,为超前支护的必要性提供依据和超前支护的施工提供数据支持,以保证工程施工的顺利进行,为后续类似工程设计提供参考。
Based on the finite element method of Mohr-Coulomb elasto-plastic model and unloading theory of rock excavation and considering the mechanism of ground stress acting on the tunnel, a three-dimensional large-scale three-dimensional model of soft rock section in double-hole four-head diversion tunnel of Danba hydropower station The mechanical calculation of rock mass is carried out. Excavation is carried out with different depths of the dug face and a certain depth from the hole. The displacement of different key points during each step of excavation under different depths of projectile is calculated, and the optimal depth of projectile propulsion that should be selected in practical engineering should be compared and selected. Under this depth of advance, The position of the displacement of the reserve for the advance support the need to provide evidence and advanced support to provide data to support the construction in order to ensure the smooth progress of construction for the follow-up similar engineering design reference.