盾构隧道施工松动土压力计算方法研究

黎春林

doi:10.11779/CJGE201409019

盾构隧道施工松动土压力计算方法研究 English Version

黎春林

铜陵学院建筑工程学院,安徽铜陵 244000

基金项目: 国家自然科学基金项目（51108078）; 安徽省自然科学基金项目（1408085ME98）; 铜陵学院人才科研启动基金项目（2012tlxyrc07）

详细信息

作者简介:
黎春林（1971- ）,男,安徽宿松人,博士,副教授,主要从事岩土工程设计研究。E-mail: lichunlin111@126.com。

中图分类号: TU472
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- 文章访问数: 988
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出版历程
- 收稿日期: 2013-10-10
- 发布日期: 2014-09-21

Method for calculating loosening earth pressure during construction of shield tunnels

LI Chun-lin

School of Civil and Architectural Engineering, Tongling University, Tongling 244000, China

摘要

摘要: 在盾构隧道施工中,因管片支护和注浆填充,隧道拱顶土体位移受限制,土拱效应不完全发挥,土体剪应力小于其抗剪强度,使得Terzaghi松动土压力理论不适用于盾构隧道。针对这一情况,在Handy理论基础上推导了土的侧压力系数计算公式,得出侧压力系数的变化规律,其值与主应力旋转角度相关,其大小在主动土压力系数和被动土压力系数之间变化;并认为土拱效应的发挥和隧道拱顶位移相关,据此,在Terzaghi松动土压力理论基础上推导了一种可以考虑地层损失和管片刚度的松动土压力计算公式;并通过对土拱高度的讨论,提出一种简化的隧道施工扰动范围判断方法。
- 盾构隧道 /
- 不完全土拱效应 /
- 松动土压力 /
- 施工扰动
Abstract: Due to the limitations on vault displacement, such as lining segment support and synchronous grouting, the soil arching effect only plays partial function during construction of shield tunnels, and the shear stress of soil is less than its shear strength. Terzaghi's loosening earth pressure theory cannot be used for this case. To solve this problem, a method for calculating lateral pressure coefficient is deduced based on the Handy's theory. The results show that the lateral pressure coefficient is associated with the rotation angle of the principal stress, and its value varies between coefficients of active and passive earth pressures. Subsequently, the development of soil arching effect is related to the vault displacement of the tunnels. Accordingly, a computational formula for loosening earth pressure is proposed considering the ground loss and the stiffness of the segment based on the Terzaghi's theory. Finally, a simplified method for predicting construction disturbance scope of tunnels is put forward by studying soil arching height.
- shield tunnel /
- partially-developed soil arching effect /
- loosening earth pressure /
- construction disturbance

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参考文献(13)

[1]	TERZAGHI K. Stress distribution in dry and in saturated sand above a yielding trap-door[C]// Proceedings of First International Conference on Soil Mechanics and Foundation Engineering. Cambridge, Massachusetts, 1936: 307-311.
[2]	朱伟, 钟小春, 加瑞. 盾构隧道垂直土压力松动效应的颗粒流模拟[J]. 岩土工程学报, 2008, 30(5): 750-754. (ZHU Wei, ZHONG Xiao-chun, JIA Rui. Simulation on relaxation effect of vertical earth pressure for shield tunnels by particle flow code[J]. Chinese Journal of Geotechnical Engineering, 2008, 30(5): 750-754. (in Chinese))
[3]	KEZDI A. Lateral earth pressure[M]// Foundation Engineering Handbook, WINTERKORN H F, FANG H Y, ed. New York: Van Nostrand Reinhold Co., 1986: 147-220.
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[7]	陈若曦, 朱斌, 陈云敏, 等. 基于主应力轴旋转理论的修正Terzaghi 松动土压力[J]. 岩土力学, 2010, 31(5): 1402-1406. (CHEN Ruo-xi, ZHU Bin, CHEN Yun-min, et al. Modified Terzaghi loozening earth pressure based on theory of main stress axes rotation[J]. Rock and Soil Mechanics, 2010, 31(5): 1402-1406. (in Chinese))
[8]	武军, 廖少明, 张迪. 基于颗粒流椭球体理论的隧道极限松动区与松动土压力[J]. 岩土工程学报, 2013, 35(4): 714-721. (WU Jun, LIAO Shao-ming, ZHANG Di. Loosening zone and earth pressure around tunnels in sandy soils based on ellipsoid theory of particle flows[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(4): 714-721. (in Chinese))
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文章访问数: 988
HTML全文浏览量: 44
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盾构隧道施工松动土压力计算方法研究 English Version

作者简介: 黎春林（1971- ）,男,安徽宿松人,博士,副教授,主要从事岩土工程设计研究。E-mail: lichunlin111@126.com。

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Method for calculating loosening earth pressure during construction of shield tunnels

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作者简介:
黎春林（1971- ）,男,安徽宿松人,博士,副教授,主要从事岩土工程设计研究。E-mail: lichunlin111@126.com。