双隧道对群桩影响的三维离心模型试验研究

马少坤; 吕虎; 吴宏伟; 赵乃峰

双隧道对群桩影响的三维离心模型试验研究 English Version

马少坤^{1, 2},
吕虎³,
吴宏伟³,
赵乃峰⁴

1. 广西大学土木建筑工程学院，广西南宁 530004；2. 广西大学工程防灾与结构安全重点实验室，广西南宁 530004；3. 香港科技大学土木及环境工程系，香港；4. 同济大学地下建筑与工程系，上海 200092

基金项目: 国家自然科学基金项目（51068002）；广西岩土力学与工程

详细信息

作者简介:
马少坤(1972- )，男，湖南人，博士，教授，硕士生导师，主要从事地下工程的研究与教学工作。E-mail: mashaokun@sina.com。

中图分类号: TU470
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出版历程
- 收稿日期: 2012-08-26
- 发布日期: 2013-07-16

Three-dimensional centrifuge modelling of the effects of twin tunnelling on existing pile group in expansive clay

MA Shao-kun^{1, 2},
Lü Hu³,
Wong K S³,
NG C W W⁴

1. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China; 2. Key Laboratory of Disaster Prevention and Structural Safety, Guangxi University, Nanning 530004, China; 3. Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Hong Kong, China; 4. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China

摘要

摘要: 在膨胀土地基中进行了双隧道对群桩影响的三维离心模型试验，目标地层损失比为2%，着重研究引起的地基沉降槽、附加弯矩、轴力的变化规律。试验得出：膨胀土地基中每个隧道开挖形成的地表沉降槽仍符合Peck高斯曲线，双隧道共同作用形成的沉降槽可以看作是每个隧道单独作用形成的沉降槽的叠加；两个隧道开挖引起的前后桩弯矩规律类似，最大附加弯矩均出现在拱冠附近，但存在明显的前桩遮拦效应；随着第一个隧道开挖的临近及远离，前后桩轴力会发生明显不同变化，而第二个隧道影响明显不同，附加轴力最大值约为工作荷载的10%。
- 双隧道 /
- 三维离心模型试验 /
- 群桩 /
- 膨胀土
Abstract: A three-dimensional centrifuge modelling is conducted to investigate the effects of twin tunnel construction on existing pile groups in expansive soil with volume loss of 2.0%. Surface settlement troughs, additional bending moments and axial forces are studied. As expected, the measured settlement troughs induced by each tunnel excavation fit the Gausian distributions well. It is found that the combined settlement trough caused by twin tunneling is similar to the superposition of two individual settlement troughs by each single tunneling. Consistently, the additional bending moments of piles induced by each of the two tunnels are similar, where the maximum induced occurs near the axis of tunnel. The additional axial forces induced in front and rear piles are different due to the the first and second tunnel advancements. The maximum induced axial force is 10% of work load of the piles.
- twin tunnel /
- three-dimensional centrifuge modelling /
- pile group /
- expansive soil

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[1]

BEZUIJEN A,VAN der Schrier J. The influence of a bored tunnel on pile foundations[C]// Proceedings of the International Conference Centrifuge 94. Singapore, 1994: 681-685.
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双隧道对群桩影响的三维离心模型试验研究 English Version

作者简介: 马少坤(1972- )，男，湖南人，博士，教授，硕士生导师，主要从事地下工程的研究与教学工作。E-mail: mashaokun@sina.com。

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Three-dimensional centrifuge modelling of the effects of twin tunnelling on existing pile group in expansive clay

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作者简介:
马少坤(1972- )，男，湖南人，博士，教授，硕士生导师，主要从事地下工程的研究与教学工作。E-mail: mashaokun@sina.com。