第三系富水粉細砂地層大斷面隧道綜合施工技術(shù)研究
[Abstract]:Based on the Taoshuping tunnel of the Lanzhou-Chongqing railway, this paper studies the comprehensive construction technology of the large-section tunnel through the Tertiary water-rich silty sand layer, and solves the problems of precipitation and construction stability in the tunnel construction. The main work and research results are as follows: (1) through the analysis of the hydrogeological conditions of Taoshuping Tunnel, the paper preliminarily determines the precipitation measures that can be used in the tunnel construction, and through the field construction practice, Finally, the effective precipitation of water-rich silty sand formation is realized by adopting the integrated precipitation scheme of vacuum light well point precipitation, deep well precipitation and advanced precipitation. It creates a favorable construction environment for tunnel excavation. (2) according to the geological conditions of Taoshuping tunnel and the construction method of large section tunnel, the method of crossing middle and next door is preliminarily determined. (3) the construction process of the three construction methods is analyzed by numerical simulation, and the displacement changes of surrounding rock in different construction methods are compared and studied. Stress change and the change of stress and deformation characteristics of supporting structure. Numerical analysis shows that the dome settlement produced by the double guide tunnel advance method is much smaller than that by the CRD method and the double column method, and the double guide tunnel advance method is the 58 settlement produced by the CRD method and the 73th settlement produced by the double column construction method. Based on the numerical simulation analysis, the two-hole advance method is determined as the best construction plan. (4) track the tunnel construction, select the typical section to monitor the dynamic response of the tunnel construction, the field monitoring data analysis shows that, The double guide tunnel advance method has a good effect on the stability of surrounding rock and can adapt well to the construction of water-rich silty sand strata.
【學位授予單位】:西安建筑科技大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:U455.4
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