高地应力区隧道信息化施工与风险评估研究

发布时间：2018-11-15 06:51

【摘要】：随着我国西部大开发的不断推进,我国铁路隧道工程进入了迅猛发展的时期,在我国西部,尤其是西南部地区多为山岭地带,地质环境条件相应比较复杂,在铁路隧道修建过程中时有遇见一些地质灾害,比如塌方、围岩变形等,这些地质灾害将会对施工人员的人身安全带来巨大的隐患。因此在铁路隧道修建的过程中进行信息化施工并对影响隧道围岩稳定性的因素进行分析,这对隧道安全施工具有良好的指导意义。本文以丽香铁路长坪隧道为工程背景,针对该隧道围岩稳定性进行风险分析,主要研究内容主要包括以下几个方面。(1)本文对高地应力区隧道TSP超前地质预报的发展现状、现场监控量测、地应力测量以及贝叶斯网络的的发展现状进行了较为详细的论述。(2)简单介绍丽香铁路长坪隧道的工程概况,制定信息化施工(现场监控量测与T SP超前预报)的方案。进行现场监测和超前预报,根据典型断面现场监控量测数据,基于最小二乘法构建预测模型,预测隧道围岩变形的趋势,通过对TSP预报参数进行研究分析,建立一种以TSP预报参数为基础的隧道围岩分级方法,使之快速准确的对长坪隧道围岩进行分级,并对长坪隧道典型地段进行围岩稳定性分析。(3)现场采用水压致裂法对丽香铁路长坪隧道进行地应力测量,并对测量结果分析研究,得出长坪隧道主要以水平主应力为主,Rc/σmax4,隧道的原始应力水平为极高应力水平。(4)结合工程实际情况可知,影响隧道围岩稳定性的因素有很多,本文以长坪隧道初始应力状态、主要结构面产状、开挖断面、支护强度、支护时机以及围岩级别作为研究因素,构建贝叶斯网络风险评估模型,对隧道修建过程中的自然因素和施工因素的风险进行评估,最终得出DK60+760+DK60+640段隧道发生大变形的概率等级为5级。即该段隧道频繁发生大变形,因此在隧道施工过程中应注意安全。
[Abstract]:With the continuous development of China's western region, the railway tunnel project in China has entered a period of rapid development. In the western part of China, especially in the southwest region, most of them are mountain areas, and the geological environment conditions are relatively complex. In the process of railway tunnel construction, there are some geological disasters, such as collapse, deformation of surrounding rock and so on. These geological disasters will bring huge hidden danger to the personal safety of construction personnel. Therefore, the informatization construction in the construction of railway tunnel and the analysis of the factors affecting the stability of surrounding rock of the tunnel are of good guiding significance to the safe construction of the tunnel. Taking Changping Tunnel of Lixiang Railway as the engineering background, this paper analyzes the risk of surrounding rock stability of the tunnel. The main research contents include the following aspects. (1) the present situation of TSP advanced geological prediction for tunnels in high ground stress area is discussed in this paper. The development status of field monitoring measurement, in-situ stress measurement and Bayesian network is discussed in detail. (2) the engineering situation of Changping Tunnel in Lixiang Railway is introduced briefly. Make information construction (site monitoring measurement and T SP advanced forecast) scheme. According to the field monitoring data of typical section, the prediction model is constructed based on least square method, and the trend of tunnel surrounding rock deformation is forecasted. The prediction parameters of TSP are studied and analyzed. A method of surrounding rock classification based on TSP prediction parameters is established to classify the surrounding rock of Changping tunnel quickly and accurately. The stability of surrounding rock in typical section of Changping tunnel is analyzed. (3) the in-situ stress measurement of Changping tunnel of Lixiang railway is carried out by hydraulic fracturing method, and the results show that the main horizontal principal stress is the main stress in Changping tunnel. The original stress level of Rc/ 蟽 max4, tunnel is very high stress level. (4) combined with the actual situation of engineering, there are many factors that affect the stability of surrounding rock of tunnel. In this paper, the initial stress state of Changping tunnel and the occurrence of main structure surface are taken into account. The risk assessment model of Bayesian network is constructed to evaluate the risk of natural factors and construction factors in the process of tunnel construction. Finally, the probability of large deformation in DK60 760 DK60 640 tunnel is 5. That is to say, large deformation occurs frequently in this section of tunnel, so we should pay attention to safety in the course of tunnel construction.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455

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