盾构隧道衬砌结构计算模型探讨

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摘要研究目的: 目前被工程界广泛采用的隧道拱底为压缩弹簧形式的衬砌结构计算模型，缺少相应的理论支撑，得到隧道拱底处相对较小的衬砌内力，以及隧道拱底的沉降变形趋势，与实际情况不符,且可能导致拱底处衬砌结构安全系数偏低。为了进一步加强衬砌结构设计的准确性与可靠性，对不同的衬砌结构计算模型展开对比分析，指出该模型被广泛采用的根本原因，并提出合理的计算模型。

研究结论: （1)隧道拱底的地基反力形式与拱底位移趋势密切相关，当拱底呈隆起变形时,地基反力仅由反作用力组成,当拱底呈压缩变形时,地基反力由反作用力与地基压缩抗力两部分组成；（2)对于盾构法隧道，应采用拱底为反作用力形式的衬砌结构计算模型，该模型能准确地反映衬砌的受力特点与位移趋势，可以有效克服隧道拱底处安全系数不足的隐患；（3)提出了基于拱底地层位移趋势的拱底作用力形式以及相应的荷载-结构计算模型；（4)研究成果可用于盾构法隧道、矿山法隧道、明挖或暗挖的地铁车站等地下工程。

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	戴志仁

关键词 ：盾构隧道, 衬砌结构, 计算模型, 地基反力, 压缩弹簧

Abstract：Research purposes：The compression spring calculation mode is commonly used for the arch bottom of the shield tunnel, but it lacks the theoretical support. The internal forces and the settlement deformation trend obtained with this model are less than and inconsistent with the real situation so as to make the safety factor over lower. In order to enforce the reliability and accuracy of lining structure design，the comparison and analysis of different calculation models are carried out，the fundamental reason for wide application of the compression spring calculation model is put foreward， and the reasonable calculation model is presented.

Research conclusions：(1 )The reaction force form of the foundation of the arch bottom of the tunnel is closely related to the displacement trend. When the arch bottom raises and deforms, the reacting force of the foundation is only composed of the counterforce，but when the arch bottom compressedly deforms，the reacting force is composed of the counterforce and the compression resistance of the foundation. (2 ) For the shield tunnel，the lining structure calculation model of reacting force on the arch bottom should be used and it can precisely reflect the load bearing characteristics and displacement trend，and overcome the security risk due to the insufficient safety factor. (3) The form of the reacting force on the arch bottom based on the displacement trend and the corresponding calculation model are put forward. (4) This research result can be applied in the shield tunneling project, mining project and open excavation subway station or subsurface excavation subway station.

Key words： shield tunnel lining structure calculation model reacting force of foundation compression spring counterforce

收稿日期: 2012-10-13

PACS:

U31.2.2

作者简介: 戴志仁，1981年出生，男，工程师

引用本文:

戴志仁. 盾构隧道衬砌结构计算模型探讨[J]. 铁道工程学报, 2013, 30(6): 52-58.
DAI Zhi-ren. Discussion on Calculation Model for Lining Structure of Shield Tunnel. 铁道工程学报, 2013, 30(6): 52-58.

链接本文:

http://tdgcxb.crec.cn/CN/ 或 http://tdgcxb.crec.cn/CN/Y2013/V30/I6/52

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[10] 戴志仁.盾构隧道盾尾管片上浮机理与控制[J].中国铁道科学，2013(1 ):59-66. Dai Zhiren. Study on the Mechanism and Control Principle of Upward Movements of Segments at the Rear of Shield Tail [ J], China Railway Science，2013 (1)： 59-66.