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隧道建设(中英文) ›› 2016, Vol. 36 ›› Issue (7): 793-799.DOI: 10.3973/j.issn.1672-741X.2016.07.004

• 研究与探索 • 上一篇    下一篇

盾构隧道侧穿高架桥桩基条件下群桩遮拦效应分析

汪鹏程1,2, 邵长征1,2, 刘志1,2   

  1. (1.合肥工业大学土木与水利工程学院,安徽合肥 230009; 2.合肥工业大学安徽土木工程结构与材料省级实验室, 安徽合肥 230009)
  • 收稿日期:2015-12-07 修回日期:2016-03-09 出版日期:2016-07-20 发布日期:2016-07-27
  • 作者简介:汪鹏程(1968—),男,安徽铜陵人,2005年毕业于浙江大学,岩土工程专业,博士,副教授,主要从事岩土与地下结构工程设计方向的研究工作。Email: zjuwangpc@126.com。
  • 基金资助:

    国家自然基金面上项目(51179043)

Analysis of Shielding Effect of A Pile Group to Shield Tunneling nearby Pile Foundation of Viaduct

WANG Pengcheng1, 2, SHAO Changzheng1, 2, LIU Zhi1, 2   

  1. (1. School of Civil Engineering, Hefei University of Technology, Hefei 230009, Anhui, China; 2. Anhui Key Laboratory of Civil Engineering and Materials, Hefei University of Technology, Hefei 230009, Anhui, China)
  • Received:2015-12-07 Revised:2016-03-09 Online:2016-07-20 Published:2016-07-27

摘要:

为了研究土体c(黏聚力)、φ(内摩擦角)和桩隧间距X对群桩遮拦效应的影响,以合肥轨道交通1号线盾构隧道近距离侧穿高架桥桩基群工程为背景,采用三维数值分析方法,分析了盾构掘进过程中桩基的变形规律,得出以下结论: 1)桩基的位移随着盾构开挖面的靠近逐渐增大,当盾尾离开桩基所在平面后逐渐稳定; 2)土体的c、φ值对群桩桩基水平位移、竖向位移和轴力的遮拦效应影响比较大,c、φ值越大群桩遮拦效应越不明显; 3)桩隧间距X对桩基水平位移和轴力遮拦效应影响较为明显,X越小桩体变形和受力越复杂,群桩遮拦效应越明显。

关键词: 数值分析, 桩基群, 遮拦效应, 桩体变形, 盾构隧道

Abstract:

The deformation rules of pile foundation of viaduct induced by shield tunneling nearby are analyzed by 3D numerical analysis method, so as to learn the influences of soil cohesive strength c, internal friction angle φ and distance between pile and tunnel axial line X on shielding effect of a pile group, by taking shield tunnel of Hefei Metro Line No. 1 crossing nearby pile foundation of viaduct for example. Some conclusions are drawn as follows: 1) The displacement of the pile foundation increases with the distance between pile foundation and shield head decreases; and the displacement of the pile foundation becomes stable when shield tail passed. 2) The c and φ of soil affect the shielding effect of pile group to horizontal displacement, vertical displacement and axial force a lot; and the shielding effect of pile group decreases with the c or φ increases. 3) The influence of X on shielding effect of pile group to pile foundation is obvious; and the shielding effect of pile group decreases with the X decreases.

Key words: numerical analysis, pile foundation group, shielding effect, pile deformation, shield tunnel

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