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以湖南省炎汝高速公路梅子山隧道为依托,根据冲沟段的地形地质条件,通过数值模拟研究浅埋偏压和拱部出露两种情况的施工力学行为,辨识施工中存在的不利因素,进行施工风险分析,提出隧道穿越冲沟段施工存在塌方、大变形、渗漏水、边仰坡失稳等风险事件,并有针对性地提出风险控制措施。结合现场施工与监测情况,讨论现场实施效果,洞内外变形正常,未发生突发事故,风险控制措施切实可行,可供同类型山岭隧道穿越冲沟段施工提供参考。
Based on the topographic and geological conditions in the gully section of the Autonomous Region on the Meishan Tunnel of Yan - Ru Expressway in Hunan Province, the construction mechanics behaviors of shallow bias and arch exposed are studied by numerical simulation to identify the unfavorable factors in construction , The risk analysis of the construction was carried out, and some risk events such as landslide, big deformation, seepage water and instability of the slope on the slope were proposed during construction of the tunnel across the gully. Risk control measures were put forward in a targeted manner. Combined with the site construction and monitoring, the site implementation effect is discussed, the deformation inside and outside the cave is normal, no unexpected accident occurs, and the risk control measures are feasible, which can provide reference for the same type of mountain tunnel construction across the gully.