Simplified calculating method for evaluating effect of tunneling in
sands on axial force of nearby piles

JIN Jun-wei; YANG Min; DENG You-sheng; LIU Chen-hui

doi:10.16285/j.rsm.2015.S1.041

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Simplified calculating method for evaluating effect of tunneling in sands on axial force of nearby piles

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- Simplified calculating method for evaluating effect of tunneling in sands on axial force of nearby piles
- Vol. 36, Issue S1, Pages: 241-246(2015)
- 作者机构：
  
  1. 同济大学地下建筑与工程系,上海,200092
  2. 同济大学岩土及地下工程教育部重点实验室,上海,200092
  3. 湖北工业大学土木工程与建筑学院,湖北,武汉,430068
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2015.S1.041
  CLC： TU443
- Online First：14 June 2018，
  
  Published：2015
- 稿件说明：
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JIN Jun-wei, YANG Min, DENG You-sheng, et al. Simplified calculating method for evaluating effect of tunneling in sands on axial force of nearby piles[J]. 2015, 36(S1): 241-246.
DOI：

JIN Jun-wei, YANG Min, DENG You-sheng, et al. Simplified calculating method for evaluating effect of tunneling in sands on axial force of nearby piles[J]. 2015, 36(S1): 241-246. DOI： 10.16285/j.rsm.2015.S1.041.

摘要

基于砂土中隧道开挖引起的土体竖向位移经验公式，分析隧道开挖对邻近桩基础的竖向影响。采用两阶段计算方法，将邻近桩基础视为竖向被动桩，依据砂土中隧道开挖引起地表及地表以下土体产生的沉降槽，考虑桩土相互作用的非线性，得到砂土中隧道开挖对邻近桩基础轴力影响的简化计算方法，并与土工离心试验结果进行对比，验证了该方法的合理性。在研究过程中，分析了隧道覆盖层厚度、隧道直径、隧道与桩之间的距离、隧道土体损失率、桩长、桩径等因素。研究结果表明，桩身轴力随着覆盖层厚度的增加而减小，随隧道直径和土体损失率的增大而增加；隧道与桩之间距离为2.5倍隧道直径时对轴力的影响最大；随着桩长、桩径的增加，桩身轴力逐渐增加。

Abstract

Based on traditional empirical equations for calculating vertical displacements of sands during tunneling in sands

effect of tunneling on nearby pile foundation in respect of axial force in sands is investigated. According to ground and subsurface settlement troughs induced by tunneling in sand

a simplified calculating method for evaluating effect of tunneling in sands on axial force of nearby piles is firstly proposed by considering nonlinear pile-soil interaction. Meanwhile

the two-step method was adopted and the nearby piles were taken as vertical passive piles. The results calculated using the simplified method is then compared with experimental results obtained from geotechnical centrifuge tests

which validate the rationality of the proposed method. In addition

many influence factors

including tunnel cover

tunnel diameter

distance between tunnel and pile

tunnel volume loss

pile length and pile diameter are also investigated during the study. It has been found that the axial force of pile decreases with the increase of tunnel cover thickness

while increasing with the increase of tunnel diameter and soil volume loss ratio. The axial force reaches to the maximum value when the distance between tunnel and pile is approximately 2.5 times of the tunnel diameter. The axial force of pile increases with the increase of pile length and pile diameter.

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