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在隧道施工过程中,因隧道开挖扰动的影响,原有山体稳定结构会出现短暂失稳,且洞口坡体最为薄弱,易出现滑坡等地质灾害,从而对隧道洞口坡体进行监控量测是非常必要的。为了阐述监控量测在治理隧道洞口滑坡中的作用,本文以湖南省龙永高速某隧道洞口滑坡为例,在针对性地制定监控量测方案后,由洞内至洞外布设多个量测断面,并进行历时335d的日常精密测量,总结、分析各项量测数据、图表,对该隧道洞口滑坡成因、趋势作出了准确地判断,为设计单位制定处治该隧道滑坡方案提供了科学的依据。
In the process of tunnel construction, due to the disturbance of tunnel excavation, the original stable structure of the mountain will appear transient instability, and the slope body of the hole is the weakest, prone to geological disasters such as landslide, so as to monitor and measure the slope of tunnel entrance very necessary. In order to illustrate the role of monitoring and measuring in controlling landslides in tunnel entrances, this paper takes a landslide at a tunnel entrance in Longyong Expressway of Hunan Province as an example. After the monitoring and measuring program has been formulated, a number of surveys Section, and carried out daily precision measurement of 335d, summarize and analyze various measurement data and charts, made accurate judgment on the causes and trends of the landslide at the tunnel entrance, and provided a scientific basis for the design unit to formulate the scheme for treating landslide in the tunnel .