黄土地铁隧道湿陷性基底地基处治优化模型试验

doi:10.13722/j.cnki.jrme.2020.0159

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摘要湿陷性黄土具有水敏性，黄土隧道地基浸水湿陷易诱发衬砌开裂等各类病害问题。为指导黄土地区隧道地基处治设计，依托黄土地铁隧道工程，研发地基浸水模型试验装置，系统开展地表三轴搅拌桩处治隧道基底地基效果的模型试验，针对桩间距和处治深度2个主要因素，通过监测隧道结构受力变形特性，来评价不同桩间距和处治深度对处治效果的影响。结果表明：桩间距越小，地基浸水引起的衬砌受力变化值越小，当桩间距减小到2.1 m时，进一步减小桩间距地基处理效果增加不明显；地基处治深度越大，对地基浸水引起的衬砌结构受力控制越明显，当处治深度达到6 m时，浸水引起的隧道衬砌各点受力变化不明显，因此隧道基底湿陷地基处理只要达到6 m即可，允许有3 m的剩余湿陷量。隧道结构受力对处治深度的敏感性大于桩间距，地基处治深度达到6 m时，进一步减小桩间距对处治效果没有明显作用，隧道湿陷地基处理应首先考虑保证足够的处治深度，即应遵循“宁长勿密”的原则。

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	张玉伟1
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	宋战平1
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	翁效林3
	段宇昕1
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关键词 ：土力学, 黄土, 地铁隧道, 湿陷性地基, 三轴搅拌桩, 模型试验

Abstract：Collapsible loess is sensitive to water，and floating collapsible foundation of loess tunnels is easy to cause lining cracking and other diseases. In order to guide the design of tunnel foundation treatment in loess areas，in this paper，a ground immersion model test device was developed relying on a loess metro tunnel project，the model test of surface triaxial mixing piles treating tunnel foundations was systematically carried out，and the effects of two main factors including the pile spacing and the treatment depth on treatment results were evaluated through monitoring the mechanical deformation characteristics of the tunnel structure. The results show that，the smaller the pile spacing is，the smaller the change values of the lining bending moment，axial force and earth pressure caused by foundation soaking are，while that，as the pile spacing is reduced to a certain value，the further reduction of the pile spacing will not increase the foundation treatment effect obviously. The larger the foundation treatment depth is，the more obvious the stress control of the lining structure caused by foundation soaking is. When the treatment depth reaches a certain value，however，the stress change of each point of the tunnel lining caused by soaking is not obvious，so the treatment depth only needs to reach the threshold value with a allowed amount of residual collapse. It is also indicated that the sensitivity of the stress of the tunnel structure to the treatment depth is greater than the pile spacing. When the treatment depth of the foundation reaches the threshold value，further reducing the pile spacing has no obvious effect on the treatment effect. Therefore，when dealing with the collapsible foundation of tunnels，it is suggested to first consider ensuring sufficient treatment depth of the foundation，following the principle of “long better than dense”.

Key words： soil mechanics')" href="#">

soil mechanics loess metro tunnels collapsible foundation triaxial mixing piles ')" href="#">model test

引用本文:

张玉伟1，2，宋战平1，2，翁效林3，段宇昕1，2. 黄土地铁隧道湿陷性基底地基处治优化模型试验[J]. 岩石力学与工程学报, 2020, 39(9): 1912-1920.
ZHANG Yuwei1，2，SONG Zhanping1，2，WENG Xiaolin3，DUAN Yuxin1，2. Model test on treatment of collapsible loess foundation of metro tunnels#br#. , 2020, 39(9): 1912-1920.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0159 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I9/1912

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