大伙房输水工程隧洞出口段偏压应力分析及施工对策

摘要

辽宁省大伙房水库输水工程隧洞出口段属于强风化的浅埋、偏压不良地质洞段。为保证安全进洞，掌握浅埋偏压隧洞围岩受力情况及变形规律，本文运用非线性有限元法模拟隧洞开挖过程，分析了偏压隧洞开挖后的应力分布状态、围岩变形及稳定性，并据此采取相应的施工对策，顺利地通过了浅埋、偏压的洞口段，确保施工安全的同时保证了工程质量。%Liaoning Dahuofang Reservoir Water Diversion Project Tunnel Outlet Section belongs to geological opening section with strong weathered shallow coverage and poor bias stress .Non-linear finite element method is adopted in the paper to simulate tunnel excavation process in order to ensure safe tunnel excavation , and master the force condition and deformation rules of shallow coverage bias stress tunnel surrounding rock .The stress distribution status , surrounding rock deformation and stability after bias stress tunnel excavation are analyzed , corresponding construction strategy is adopted accordingly , shallow coverage and bias pressure opening sections are smoothly constructed , thereby ensuring construction safety, and project quality at the same time .