小净距上下重叠盾构隧道施工扰动数值分析

发布时间：2018-01-05 13:35

本文关键词：小净距上下重叠盾构隧道施工扰动数值分析　出处：《科学技术与工程》2017年11期 　论文类型：期刊论文

【摘要】：以杭州市环城北路地下通道为工程背景,对小净距上下重叠盾构隧道的施工扰动进行了研究。通过ABAQUS 6.13有限元软件进行数值模拟,对比分析不同开挖顺序工况下周围土体的变形特点,地表沉降的变化,以及后建隧道对先建隧道衬砌的变形和应力影响。研究结果表明:盾构隧道的开挖会引起明显的地表沉降,约3.0cm;后建隧道的施工会引起先建隧道的内外侧应力相应地减小;不同施工顺序对这两者无显著影响,但会显著影响已建隧道的衬砌位移。先上后下工况时,后建隧道对先建隧道表现为加剧衬砌沉降,而在先下后上工况时,后建隧道对先建隧道的衬砌顶部位移有保护的作用,累计减弱下沉0.46 cm。因此推荐采用先开挖下行隧道,再开挖上行隧道的施工顺序。
[Abstract]:Taking the underground passage of Huancheng North Road in Hangzhou as the engineering background, this paper studies the construction disturbance of the shield tunnel with small net distance, and carries on the numerical simulation by ABAQUS 6.13 finite element software. The deformation characteristics of surrounding soil and the change of surface settlement under different excavation sequence are compared. The results show that the excavation of shield tunnel will cause obvious surface subsidence, about 3.0 cm; The stress of the inner and outer side of the pre-built tunnel will be reduced correspondingly by the construction of the post-built tunnel. Different construction sequence has no significant effect on both of them, but it will significantly affect the lining displacement of the built tunnel. When the first working condition is up and down, the later tunnel will increase the settlement of the first tunnel, but in the first and then the upper working condition. The post-built tunnel can protect the top displacement of the lining of the pre-built tunnel and weaken the subsidence by 0.46 cm. Therefore it is recommended that the construction sequence of the downlink tunnel and the upstream tunnel should be first excavated and then excavated.
【作者单位】：浙江大学滨海和城市岩土工程研究中心;杭州市城东新城建设投资有限公司;中铁第四勘察设计院集团有限公司;
【基金】：国家重点基础研究发展计划(973计划)(2015CB057801) 国家自然科学基金(51278449,51238009,51338009)资助
【分类号】：U455.43
【正文快照】： 随着城市规模的扩大,土地资源日益枯竭,人们的出行需求越来越难以得到满足,发展地下轨道交通逐渐成为城市解决交通问题的常用方法。在城市中开挖隧道,除了隧道工程本身常见的渗透、地质不良等设计施工问题,最具挑战性的是研究和控制开挖隧道本身对其周围环境造成的影响,如对城

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