| 引用本文: | 翁效林,孙腾,冯莹.桩基础承载过程对近距离地铁隧道影响机制分析[J].哈尔滨工业大学学报,2016,48(3):138.DOI:10.11918/j.issn.0367-6234.2016.03.023 |
| WENG Xiaolin,SUN Teng,FENG Ying.Influence of loading pile foundation on existing neighboring subway tunnel[J].Journal of Harbin Institute of Technology,2016,48(3):138.DOI:10.11918/j.issn.0367-6234.2016.03.023 |
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| 摘要: |
| 为更好地了解桩基础承载过程对已建成隧道的长期影响，通过改进离心场桩基加载装置和试验监测设备进行离心试验，分析桩基础承载过程对邻近已有隧道的变形及受力影响，在试验中考虑了参数变化（不同桩顶荷载以及桩基础与隧道结构净距）因素，并基于试验结果对桩-土-隧道之间的相互作用进行了探讨.结果表明：承载桩基会引发临近地铁隧道结构变形，且以沉降变形为主，隧道截面影响区域横向变小，纵向变大；相对于隧道双侧存在承载桩基础，单侧桩基础荷载造成隧道所受弯矩分布向桩基础方向发生明显偏转，隧道结构向桩基础方向产生一定扭曲；桩基础承载所致附加应力会在隧道结构体产生应力集中效应，隧道拱腰部位是桩基受荷所引发土体附加荷载主要承受区；隧道结构会在承载桩周所产生的附加应力场中产生加筋阻拦效应，明显缓释桩周摩阻力在相同位置处的传递，桩顶荷载越大，缓释的程度越明显.
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| 关键词: 离心模型试验 地铁隧道 承载桩基 桩-土-隧道相互作用 |
| DOI：10.11918/j.issn.0367-6234.2016.03.023 |
| 分类号:TU411.9 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51278063). |
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| Influence of loading pile foundation on existing neighboring subway tunnel |
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WENG Xiaolin,SUN Teng,FENG Ying
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(Key Laboratory of Special Area Highway Engineering,Ministry of Education（Chang’an University）,710064 Xi’an,China)
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| Abstract: |
| In order to better understand the long-term effects of bearing pile foundation on close subway tunnel, by improving the pile load and test monitoring equipment of centrifugal field, use geotechnical centrifuge model test to analyze the deformation of adjacent existing tunnel by pile foundation in the process of bearing load with change of parameters(different loads and pile foundation pile and tunnel structure spacing), and the interaction of pile-soil-tunnel was discussed based on the test of test results, the results showed that:blocking and reinforced effect of tunnel structure change the transmission path of the additional soil load and displacement surrounding the bearing load pile, lead to stress concentration of the tunnel body. Both sides arch waist of subway tunnel are the main areas where bear the additional load caused by bearing load pile, lead to the sinking of the subway tunnel structure. The settlement is main tunnel deformation form, horizontal displacement is small, which lead to smaller transverse cross section of the tunnel. The bearing load pile exist in one side of tunnel cause moment distribution of tunnel structure deflection to pile foundation, while the direction of the tunnel structure to the foundation piles have some distortion. A relationship between relative pile-tunnel location and the pile bearing load at which tunnel displacements occurred is presented, which provides useful guidance to tunnel design engineers.
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| Key words: centrifuge modeling subway tunnel pile bearing load soil-pile-tunnel interaction mechanism |
