浅埋泥水盾构隧道开挖面被动失稳分析

发布时间：2018-01-03 10:02

本文关键词：浅埋泥水盾构隧道开挖面被动失稳分析　出处：《中南大学学报(自然科学版)》2017年07期 　论文类型：期刊论文

【摘要】：基于杭州沿江运河隧道工程,采用有限差分数值软件FLAC~(3D)对开挖面被动失稳进行研究。根据数值分析中失稳模式提出局部被动失稳二维机动场模型并采用上限分析法推导开挖面极限支护压力。对运河隧道工程进行支护压力上限解分析。研究结果表明:支护压力过大会引起开挖面局部被动失稳,开挖面局部失稳区域底部至隧道拱顶距离与隧道直径的比值主要受覆土厚度的影响,土体摩擦角变化对其影响较小。被动失稳引起开挖面前方地表1.5倍开挖直径范围内隆起。支护压力上限解分析结果与数值计算结果吻合良好,该研究为盾构隧道施工中支护压力上限值确定提供了合理理论依据。
[Abstract]:Based on Hangzhou River Canal Tunnel Project. Using finite-difference numerical software FLACU 3D). The passive instability of excavating surface is studied. According to the instability mode in numerical analysis, a two-dimensional maneuvering field model of local passive instability is proposed, and the limit support pressure of excavated surface is deduced by upper bound analysis method. The support of canal tunnel engineering is carried out. The results show that:. The local passive instability of excavating surface is caused by the overpressure of support. The ratio between the distance from the bottom to the vault of the tunnel and the diameter of the tunnel is mainly affected by the thickness of the overlying soil. The change of soil friction angle has little effect on it. Passive instability causes uplift in the range of 1.5 times of excavation diameter in front of excavation surface. The analysis results of upper limit of support pressure are in good agreement with the numerical results. The research provides a reasonable theoretical basis for determining the upper limit of support pressure in shield tunnel construction.
【作者单位】：浙江大学滨海与城市岩土工程研究中心;中国铁路设计集团有限公司;苏州大学城市轨道交通学院;浙江大学防灾工程研究所;
【基金】：国家自然科学基金青年科学基金资助项目(51508503);国家自然科学基金重点资助项目(51338009) 华东勘测设计研究院科技项目(KY2013-02-30)~~
【分类号】：U455.43
【正文快照】： (1.浙江大学滨海与城市岩土工程研究中心,浙江杭州,310058;2.中国铁路设计集团有限公司,天津,300143;3.苏州大学城市轨道交通学院,江苏苏州,215131;4.浙江大学防灾工程研究所,浙江杭州,310058)随着城市规模扩大,为了满足大流量跨区域快速交通要求,隧道成为发展的主流方向,与此

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