大伙房输水工程隧洞出口段偏压应力分析及施工对策

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。

Bias Stress Analysis of Dahuofang Water Diversion Project Tunnel Outlet Section and Construction Countermeasures

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 .