地铁盾构施工对邻近桥梁桩基的影响及防护研究

发布时间：2018-05-21 00:26

本文选题：盾构隧道 + 地表变形　；参考：《西安科技大学》2017年硕士论文

【摘要】：本文以厦门地铁1号线园博苑站～杏锦路站区间隧道盾构侧穿杏林北环高架桥工程为依托,采用理论分析、数值模拟和现场监测相结合的方法开展论文的研究工作,并提出相应的桥桩基础变形防控技术方案。(1)在原有理论基础上,分析了各类因素对地铁隧道施工引起地层变形的影响。研究表明,地铁盾构施工引起的地层位移,主要有水平位移和竖向位移,地层不同方向的位移变形,使邻近桥桩基础产生不同形式的变形。总结归出纳了盾构隧道下穿工程中常用的防控措施,同时提出了园博苑站～杏锦路站区间地铁侧穿工程中地层和桥桩的变形防控标准。(2)运用Midas GTS软件,分析地铁盾构施工引起既有桥桩变形的影响规律。模拟分析袖阀管注浆防护效果。模拟结果表明,袖阀管注浆加固措施下的地层沉降和桥桩变形都明显减小,袖阀管注浆防护效果明显。分别模拟采用17.7m、20.7m、23.7m三种长度袖阀管对土层进行注浆加固,对比分析邻近桥桩变形情况,并进行防护参数比选。综合对比各种因素分析得出23.7m长度袖阀管注浆加固更为合理。(3)结合工程实际,制定现场防控监测方案,对比分析模拟预测和现场监测结果。研究表明,模拟预测的地表沉降和现场实测地表沉降曲线趋势基本一致,袖阀管注浆加固地层后,地表沉降和邻近的杏林北环高架桥桥桩变形都控制在允许范围内,确保了地铁盾构施工期间桥梁的安全运营。
[Abstract]:Based on Xiamen Metro Line 1 Yuanyuan Station ~ Xingjin Road Station Tunnel Shield tunneling through Xinglin North Ring Viaduct Project, this paper uses the methods of theoretical analysis, numerical simulation and field monitoring to carry out the research work. Based on the original theory, the influence of various factors on ground deformation caused by subway tunnel construction is analyzed. The study shows that the ground displacement caused by shield tunneling mainly includes horizontal displacement and vertical displacement, and the displacement deformation in different directions of the stratum, which results in different forms of deformation of the adjacent bridge pile foundation. This paper summarizes the common prevention and control measures used in the shield tunnel underpass project, and puts forward the deformation prevention and control standard of stratum and bridge pile in the subway side piercing project between Yuanyuan station and Xingjin road station. 2) using Midas GTS software. The influence law of existing bridge pile deformation caused by shield construction of subway is analyzed. Simulation analysis of sleeve valve pipe grouting protection effect. The simulation results show that the ground settlement and bridge pile deformation are obviously reduced and the effect of sleeve valve pipe grouting protection is obvious. Three kinds of sleeve valve tubes with length of 17.7 m ~ 20.7 m ~ (23. 7m) were used to reinforce the soil layer respectively. The deformation of adjacent bridge piles was analyzed and the protection parameters were compared and selected. Through comprehensive analysis of various factors, it is concluded that the grouting reinforcement of 23.7m length sleeve valve pipe is more reasonable. Combined with the engineering practice, the on-site prevention and control monitoring scheme is formulated, and the simulation prediction and field monitoring results are compared and analyzed. The results show that the predicted surface settlement is basically consistent with the field measured surface settlement curve, and the deformation of the ground surface settlement and adjacent Xinglin North Ring Viaduct pile is controlled within the allowable range after grouting with sleeve valve pipe to reinforce the ground. Ensure the safe operation of the bridge during the shield construction of subway.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U443.15;U455.43;U231.3

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