上海软土地层盾构始发施工技术

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摘要研究目的：在城市隧道施工过程中,始发往往成为盾构施工成败的关键环节之一。本文通过对土体加固方法、导轨设置、反力系统的安装、验算等进行分析研究,选择合理的始发掘进参数,保证施工质量。

研究结论：(1)始发洞口地基采用φ1 000三重管高压旋喷桩进行加固,并按0.5% ～1%比例钻芯取样,经试验测得28 d无侧限抗压强度大于0.8MPa,确保了土体的稳定性; (2)在始发洞内安设洞口始发导轨保证了盾构在始发时不致于因刀盘悬空而产生盾构“叩头”现象; (3)土仓压力略高于前方土体压力,防止了盾构脱离始发基座后的“叩头”现象及并且有效地避免了地表产生过大沉降; (4)通过对始发反力架进行力学验算,确保了盾构始发过程的安全性。

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	鲍永亮
	郑七振
	唐建忠

关键词 ：软土地层, 隧道, 盾构, 始发, 施工技术

Abstract：Research purposes：Originating is one of key links of the successful construction of tunnel in city. This paper researches the method of earth reinforcement, installation of guide rail, installation and check calculation for reaction force system so as to select the reasonable parameters of preliminary boring and guarantee the construction quality.

Research conclusions：(1) The foundation of the originating tunnel portal was reinforced with φ1 000 triple tube high-pressure churning jet pile and the boring earth core for sampling with proportion of 0.5%-1% was conducted. The unconfined compression strength tested in the experiment was more than 0.8MPa and it could ensure the earth stability. (2) The portal originating guide-rail was installed in the originating tunnel portal to avoid the appearance of "knotow" of shield machine because the cutter head of the shield machine was hanging while the shield machine was originating. (3) The pressure of earth chamber was bigger than that of earth ahead. In this way, the "knotow" of the shield machine after the machine disengaging from the originating base and the over-big ground subsidence were avoided. (4) The safety of the originating process of shield was ensured though the check and calculation of the mechanics of the reaction shelf.

Key words： soft soil stratum tunnel shield originating construction technology

收稿日期: 2009-03-23

PACS:

U455

作者简介: 鲍永亮, 1982年出生,男,助理工程师。

引用本文:

鲍永亮；郑七振；唐建忠. 上海软土地层盾构始发施工技术[J]. 铁道工程学报, 2010, 27(3): 118-122.
BAO Yong-liang, ZHENG Qi-zhen, TANG Jian-zhong. Technology for Originating Construction of Shield Tunnel in Soft Soil Stratum in Shanghai. 铁道工程学报, 2010, 27(3): 118-122.

链接本文:

http://tdgcxb.crec.cn/CN/ 或 http://tdgcxb.crec.cn/CN/Y2010/V27/I3/118

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