高地應力區(qū)隧道信息化施工與風險評估研究
[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.
【學位授予單位】:湖南科技大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:U455
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