| 大断面管幕法隧道群管顶进的地表位移规律研究 |
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| 引用本文： | 唐正,王洪新,孙德安,张骁.大断面管幕法隧道群管顶进的地表位移规律研究[J].岩土力学,2022,43(7):1933-1941. |
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| 作者姓名： | 唐正 王洪新 孙德安 张骁 |
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| 作者单位： | 1. 上海大学 力学与工程科学学院，上海 200444；2. 上海城建市政工程（集团）有限公司，上海 200065 |
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| 摘 要： | 为研究管幕法群管顶进施工过程中地表位移变化规律，依托上海田林路下穿中环隧道工程，对地表位移实测数据进行了详细分析。通过数据处理发现，管幕施工期间变形发展可细分为7个阶段，其中包括4个推进阶段、3个暂停推进阶段。管幕推进阶段的地表位移由地层损失沉降和注浆引起的地表隆起叠加而成；暂停推进阶段的地表沉降主要是固结沉降。运用Peck公式对地表位移进行描述，通过现场数据反分析出各根钢管推进时的沉降槽宽度系数i和地层损失率η。基于分析结果，提出了适用于上海软黏土的i和η 计算公式，其中i的公式只与钢管半径R、钢管埋深h和土体内摩擦角φ 有关，而η的公式表达成随时间的双曲线函数。注浆导致的地表隆起可分解成各根钢管顶进伴随注浆造成的负地层损失。运用上述方法对地表位移进行预测，并与实测结果对比，验证了文中方法的正确性，成果可对类似管幕法工程施工引起的地表位移预测提供科学参考。
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| 关 键 词： | 管幕法 群顶管 地表位移 注浆隆起 Peck公式 |
| 收稿时间： | 2021-09-24 |
| 修稿时间： | 2022-04-27 |
Surface displacement during pipe roof construction of
pipe-jacking group with large section |
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| TANG Zheng,WANG Hong-xin,SUN De-an,ZHANG Xiao.Surface displacement during pipe roof construction of
pipe-jacking group with large section[J].Rock and Soil Mechanics,2022,43(7):1933-1941. |
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| Authors: | TANG Zheng WANG Hong-xin SUN De-an ZHANG Xiao |
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| Institution: | 1. School of Mechanics and Engineering Science, Shanghai University, Shanghai 200444, China;
2. Shanghai Urban Construction Municipal Engineering (Group) Co. Ltd., Shanghai 200065, China |
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| Abstract: | To study the law of surface displacement during pipe
roof construction of pipe-jacking group, this paper analyses surface
displacement data based on the Tianlin Road passing under Middle Ring Road
Tunnel Project in Shanghai. Measured data shows that deformation development during the pipe roof
construction can be divided into seven stages: 4 construction stages and 3
suspending construction stages. The surface displacement during the pipe roof
construction comprises ground loss settlement and ground heave caused by
grouting. In the suspension stages, the surface displacement is consolidation
settlement. In this paper, the surface displacement is described by the Peck
equation. The width coefficient i of surface settlement trough and
the ground loss ratio η were back
analyzed from the field measured data. Based on the analysis results, the
calculation formulas of i and η were proposed for Shanghai soft clay. i is related with
the pipe radius R, pipe buried depth h and internal friction
angle of soil φ, and the formula of η is described by a hyperbolic function
of time after jacking. The surface heave caused by the grouting can be
separated to the negative ground loss caused by each pipe jacking with
grouting. The above method was used to predict the surface displacement and the
predicted results were compared with measured data to verify the correctness of
the method in this paper, which can provide scientific reference for the
prediction of surface displacement caused by similar pipe roof method
construction. |
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| Keywords: | pipe roof method pipe-Jacking group surface displacement grouting heave Peck equation |
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