盾构隧道管片位移因素分析及控制措施研究

发布时间：2018-01-28 22:57

本文关键词： 盾构隧道管片位移现场监测数值模拟　出处：《西南交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文以成都地铁某区间盾构隧道施工为工程背景,针对目前盾构法隧道施工过程中管片位移引起的错台问题,通过现场监测资料分析和数值模拟计算对管片错台和受力情况进行研究,分析错台影响因素并提出相应的控制措施。本文主要研究内容和成果如下：(1)根据现场监测资料分析管片错台沿隧道纵向的整体分布规律和盾构推进过程中随着管片至掌子面距离增大时错台的变化规律,结果表明管片错台整体上呈先增大后减小的趋势,并最终趋于稳定；管片脱出盾尾后在浮力作用下随着管片至掌子面距离的增大,错台随之增大并趋于稳定。(2)根据管片错台和盾构施工参数的现场监测资料,比较分析了各施工参数对管片错台的影响规律,依据分析结果提出了各施工参数的控制范围。(3)通过数值模拟分析了覆土厚度、千斤顶推力、注浆压力和螺栓预紧力对管片错台的影响,结果表明覆土厚度和注浆压力增大时管片错台随之增大,并且注浆压力分布方式对管片错台的分布位置影响很大；千斤顶推力和螺栓预紧力增大时管片错台随之减小。(4)根据现场监测资料分析和数值模拟计算的研究结果,分析总结了造成管片错台的影响因素,结合实际施工情况提出了管片位移控制措施。
[Abstract]:Based on the construction of shield tunnel in a section of Chengdu Metro, this paper aims at the problem of staggered platform caused by segment displacement during the construction of shield tunnel. Based on the field monitoring data analysis and numerical simulation, the staggered table and the stress of the segment are studied. This paper analyzes the influence factors of the wrong station and puts forward the corresponding control measures. The main contents and results of this paper are as follows: 1). According to the field monitoring data, the overall distribution law of segment stagger along the longitudinal tunnel and the variation law of stagger with the increase of the distance from segment to palm in shield tunneling process are analyzed. The results show that the segment stagger has a trend of first increasing and then decreasing, and finally tends to be stable. With the increase of the distance between the segment and the face of the shield, the stagger will increase and tend to be stable. (2) according to the field monitoring data of the construction parameters of the segmental staggered platform and shield tunneling, the segment is removed from the shield tail under the action of buoyancy. Based on the analysis results, the control range of each construction parameter is put forward. The thickness of overburden and the thrust of Jack are analyzed by numerical simulation. The effect of grouting pressure and bolt pre-tightening force on the stagger of segment is studied. The results show that the stagger increases with the increase of the thickness of soil and the grouting pressure, and the distribution mode of grouting pressure has a great influence on the distribution of the stagger. With the increase of Jack thrust and bolt pre-tightening force, the segment stagger is reduced. 4) based on the field monitoring data analysis and numerical simulation results, the influence factors of segment stagger are analyzed and summarized. Combined with the actual construction situation, the control measures of segment displacement are put forward.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.43

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