拱北隧道曲线管幕钢管节长度优化研究

发布时间：2018-01-08 08:42

本文关键词：拱北隧道曲线管幕钢管节长度优化研究　出处：《隧道建设(中英文)》2017年11期 　论文类型：期刊论文

【摘要】：管节长度是拱北隧道曲线管幕设计和施工的关键参数,为了优化计算曲线管幕管节长度,通过分析顶进力和土体反力作用下的管节静力平衡条件,得出传统式和预调式2种曲线顶管土体反力分布模型。选取管幕顶部、中部、底部以及淤泥质层的顶管作为研究对象,分析不同管节长度和土体参数对管节土体反力的影响规律。结果表明:传统式曲线顶管土体反力在首节管处最大,且随管节长度增加而减小;相反,预调式曲线顶管土体反力在首节管处最小,且随管节长度增加而增大。初步分析确定管节长度为4~5 m,为减少超挖量、便于纠偏以及考虑到工作井尺寸等问题,工程最终采用管节长度为4 m的传统式曲线顶管法顺利完成。
[Abstract]:The length of pipe section is the key parameter in the design and construction of curved pipe curtain in arch north tunnel. In order to optimize the length of pipe section of curve pipe curtain, the static equilibrium condition of pipe section under the action of jacking force and soil reaction is analyzed. Traditional and preset two kinds of curve pipe jacking soil reaction distribution model is obtained. The pipe jacking of the top middle bottom and silt layer of pipe curtain is selected as the research object. The influence of different pipe length and soil parameters on the soil reaction force of pipe joint is analyzed. The results show that the reaction force of traditional curve jacking soil is the largest at the first section and decreases with the increase of pipe length. On the contrary, the soil reaction force of the preset curve jacking pipe is the smallest at the first section pipe, and increases with the increase of the pipe section length. The preliminary analysis shows that the pipe section length is 4 ~ 5 m, which is to reduce the overcut amount. It is convenient to correct deviation and take into account the size of working well, so the traditional curve pipe-jacking method with length of 4 m is adopted to complete the project successfully.
【作者单位】：中国地质大学(武汉)工程学院;
【分类号】：U455.4
【正文快照】： 0引言管幕法是非开挖施工的一种新技术,它是利用顶管技术在地下建筑物四周顶入钢管或其他类型管节形成一种临时支护结构,即管幕,然后在管幕内进行开挖或箱涵顶进施工[1]。用钢管形成的管幕可以充当临时止水或挡土结构,减少对周围土体的扰动及开挖时对地表建筑物的影响,而且也

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