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隧道洞口位于山坡位置,地质条件多为坡积土层和强风化岩层,稳定性较差。洞口开挖破坏了原有的稳定状态,加之持续降水的冲刷与浸泡,极易造成洞口段岩层的失稳。结合果林隧道洞口开挖时覆盖层滑移、边仰坡坍塌的情况,通过对洞口段失稳的原因分析、处治及信息化反馈全过程,提出了洞口失稳的综合治理方案,取得了较好的效果。同时,提出了规避该类失稳的动态施工工艺控制方法,可供同类隧道地质灾害处理借鉴和参考。
Tunnel entrance is located in the hillside location, geological conditions are mostly slope soil layer and strong weathered rock formation, the stability is poor. Excavation of the hole destroyed the original steady state, combined with continuous erosion and immersion of precipitation, can easily lead to the instability of the rock section of the mouth section. Combining the slip of overburden and the collapse of overlying slope during the excavation of Guoling Tunnel, this paper puts forward the comprehensive control plan of instability of the tunnel through the analysis, treatment and information feedback of the instability of the tunnel mouth section, Good results. At the same time, a dynamic construction process control method to avoid this kind of instability is proposed, which can be used for reference and reference of similar tunnel geological disasters.