山岭隧道穿越冲沟段施工风险分析与控制措施

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...

Analysis and Control Measures of Mountain Tunnel Construction through Gully Section

Based on information from Meizishan Tunnel of Yanru Expressway,Hunan Province and according to the topographic and geologic conditions of gully section,the construction mechanical behaviors of two cases of shallow bias and vault outcrop have been studied through numerical simulation and the negative factors existing in the construction process have been identified and the risk analysis of tunnel construction has been carried out,risk events such as collapse,large deformation,water leakage,slope destabilization etc.have been mentioned,and corresponding risk control measures have been put forward.Effects of site implementation have been discussed based on site construction and monitoring.It is shown that the deformation inside and outside the tunnel is normal,without any incidents,which illustrates that the risk control measures are practicable,and can provide reference for the construction of similar mountain tunnel through gully section.