西安地铁盾构施工地表沉降影响因素研究

发布时间：2018-01-24 01:55

本文关键词： 随机介质理论地表沉降断面收敛施工因素弹塑性理论　出处：《河南理工大学学报(自然科学版)》2014年04期 　论文类型：期刊论文

【摘要】：针对盾构施工过程中诱发的地表沉降量预测问题,将地表下沉视为一随机过程,运用随机介质理论对地表下沉量进行预测计算,将隧道周围的收敛量ΔR分为3个组成部分,即开挖面处应力释放引起的超挖量、偏心超挖量以及盾尾施工间隙.目的是为了在利用随机介质理论预测地表沉降量时,将盾构过后隧道周围的弹塑性位移对盾尾施工间隙的影响考虑进去,使得预测结果更加可靠.提出的计算断面收敛量的方法并结合随机介质理论预测得到的地表沉降数据和沉降曲线趋势与实际结果符合.并通过计算发现此二维弹塑性位移对盾尾施工间隙的影响不容忽视.考虑了盾尾弹塑性位移后的预测结果与实测结果更加接近.
[Abstract]:Aiming at the prediction of surface subsidence induced by shield tunneling, the surface subsidence is regarded as a stochastic process, and the surface subsidence is forecasted and calculated by the theory of random medium. The convergence value 螖 R around the tunnel is divided into three parts, that is, the overcut caused by the stress release at the excavation surface. The purpose of this paper is to take into account the influence of the elastoplastic displacement around the tunnel after shield tunneling on the construction clearance of shield tail when the surface settlement is predicted by the stochastic medium theory. The proposed method of calculating the convergence of cross section and combining with the theory of random medium forecast the surface subsidence data and the trend of settlement curve are in agreement with the actual results. The influence of plastic displacement on the clearance of shield tail construction can not be ignored. The predicted results are closer to the measured results after considering the elastoplastic displacement of shield tail.
【作者单位】：西安科技大学建筑与土木工程学院;
【分类号】：U455.43;U231
【正文快照】： 0引言随着社会经济的发展,城市地铁建设也迎来了建设高潮,随之而来的地下隧道开挖引起的地层位移问题也成为我国岩土工程领域广泛关注的问题.进行盾构法隧道施工时不可避免地会对周围土体产生扰动,从而引起土体移动,导致地表产生沉降、隆起等变形[1].西安地铁是我国首次在黄土

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