| 膨胀土地基中隧道施工对群桩影响研究 |
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| 引用本文： | 马少坤,WONG K S,吕 虎,吴宏伟,赵乃峰.膨胀土地基中隧道施工对群桩影响研究[J].岩土力学,2013,34(11):3055-3060. |
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| 作者姓名： | 马少坤 WONG K S 吕 虎 吴宏伟 赵乃峰 |
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| 作者单位： | 1. 广西大学 土木建筑工程学院，南宁 530004；2. 广西大学 广西防灾减灾与工程安全重点实验室，南宁 530004； 3. 香港科技大学 土木及环境工程系，香港；4. 广西大学 资源与冶金学院，南宁 530004 |
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| 基金项目： | 国家自然科学基金资助(No. 51068002)；广西岩土力学与工程重点实验室资助课题(No. 10-046-14-1)；广西重点实验室系统性研究项目资助(No. 2012ZDX09)；南宁轨道交通有限责任公司科研项目资助；香港政府研究资助局(No. 617608)。 |
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| 摘 要： | 在膨胀土地基中进行隧道对群桩影响的三维离心模型试验研究，目标地层损失比为2%，着重研究引起的地基沉降槽、桩的附加沉降、附加弯矩、轴力的变化规律。试验得出：隧道开挖沉降槽空间效应明显；隧道开挖从-0.75D至1.25D时，桩附加沉降呈线性增长，隧道开挖至1.25D以后，桩依然沉降明显。前桩与后桩沉降值不同，桩帽会出现倾斜；前桩上部出现负附加弯矩而下部出现正附加弯矩，而后桩仅在下部出现正附加弯矩；前桩附加弯矩最大值出现在隧道轴线附近，且比后桩附加弯矩大得多；前桩附加轴力随着隧道的开挖而增加，且每步最大值在隧道轴线附近。后桩的轴力也随隧道的开挖而增加，但每步最大值出现在桩顶附近。
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| 关 键 词： | 离心模型试验 隧道 群桩 相互作用 |
| 收稿时间： | 2012-10-12 |
Study of effects of tunnel construction on pile group in expansive soil |
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| MA Shao-kun,WONG K S,Lü Hu,NG CHARLES W W,ZHAO Nai-feng.Study of effects of tunnel construction on pile group in expansive soil[J].Rock and Soil Mechanics,2013,34(11):3055-3060. |
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| Authors: | MA Shao-kun WONG K S Lü Hu NG CHARLES W W ZHAO Nai-feng |
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| Institution: | 1. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China; 2. Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530004, China; 3. Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Hong Kong, China; 4. College of Resources and Metallurgy, Guangxi University, Nanning 530004, China |
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| Abstract: | A three-dimensional centrifuge model test was carried out to investigate tunnelling effects on pile group in expansive clay. A volume loss of 2% was controlled. During the test, ground settlement trough, additional settlement, additional bending moment and axial force of pile due to tunnelling were monitored. The results show that ground settlement troughs are affected obviously by the distance between the centre axis of pile group and tunnel face. The additional settlement of pile shows linear growth with the tunnel excavation from -0.75D to 1.25D; and it continues to settle even when the tunnel excavation reaches 1.25D away. The settlements of front piles and behind piles are different; and the pile cap tilts. Positive additional bending moment presents at the top of front pile while negative bending moment presents at the bottom. However, only positive additional bending moment occurs at the bottom for behind pile. Moreover, the maximum additional bending moment of the front pile occurs near the axis of tunnel; and it is much bigger than that of the behind pile. The additional axial force of the front pile increases with the tunnel construction and reaches maximum near the axis of tunnel. The additional axial force of the behind pile increases too; but it reaches maximum near the top of pile. |
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| Keywords: | centrifuge model test tunnel pile group interaction |
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