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结合双向六车道小间距公路隧道,针对其跨度大、净距小、埋深浅、围岩破碎等特点,对隧道施工方案、施工工况进行模拟计算分析,得到了在初期支护未闭合就拆除临时支撑、开挖上部核心土等不同工况下的结构安全系数和施工过程控制的关键环节;通过安全风险评估的理论和方法,对隧道施工过程中可能发生的风险事件、风险源进行了辨识、分析与评价,提出了具体的风险控制措施,保证了隧道施工安全。
Combined with two-way six-lane small-pitch highway tunnel, aiming at the problems of large span, small clear distance, shallow buried depth and broken surrounding rock, the tunnel construction scheme and construction condition are simulated and analyzed. Temporary support and excavation of the upper core soil under different conditions of the structural safety factor and construction process control key links; through the theory and method of safety risk assessment of tunnel construction process may occur risk events, risk sources were identified , Analysis and evaluation, put forward specific risk control measures to ensure the safety of tunnel construction.