浅埋大直径盾构隧道施工期衬砌上浮及地表隆起的模型研究

doi:10.3973/j.issn.2096-4498.2019.S1.028

隧道建设（中英文） ›› 2019, Vol. 39 ›› Issue (S1): 194-201.DOI: 10.3973/j.issn.2096-4498.2019.S1.028

浅埋大直径盾构隧道施工期衬砌上浮及地表隆起的模型研究

马蕾¹, 韩玉琪², 倪静¹, 汤俊杰¹, 李林³

（1. 上海理工大学环境与建筑学院, 上海 200093； 2. 上海申元岩土工程有限公司，上海 200011;  3. 上海隧道股份有限公司, 上海 200232）

收稿日期:2019-01-09 出版日期:2019-08-30 发布日期:2019-09-12
作者简介:马蕾（1992—），男，安徽淮南人，上海理工大学建筑与土木工程专业在读硕士，研究方向为软土地基处理。Email: 591364294@qq.com。*通信作者: 韩玉琪，Email: lucky_hyq@163.com。

Modeling of Tunnel Lining Uplifting and Ground Surface Heave during  Excavation of Large Diameter Shield Tunnel under Shallow Overburden

MA Lei¹, HAN Yuqi², NI Jing¹, TANG Junjie¹, LI Lin³

(1. School of Environment and Architecture, University of Shanghai for Science and Technology,  Shanghai 200093, China; 2. Shanghai Shenyuan Geotechnical Engineering Co., Ltd., Shanghai 200011, China;  3. Shanghai Tunnel Engineering Co., Ltd., Shanghai 200232, China)

Received:2019-01-09 Online:2019-08-30 Published:2019-09-12

摘要/Abstract

摘要：

为解决大直径盾构隧道施工过程中出现的浅覆土段隧道衬砌上浮与地表隆起问题，以上海虹梅南路越江隧道工程为背景，对该问题开展理论研究。将引起隧道上浮的上浮力作用分解为基于浆液时变性的静态上浮力和由注浆压力产生的动态上浮力；分别定义上浮力分布段及浆液凝固段的等效地层弹簧刚度系数，基于Winkler地基梁理论建立衬砌上浮模型；由衬砌上浮位移量计算开挖面上部土体的挤压宽度，土体经挤压隆起引起地层“反向损失”，继而求解隧道轴线上方地表横断面隆起曲线及沿隧道长度方向地表位移曲线。结果表明： 1)模型计算所得地表横断面的隆起曲线呈正态分布，与实测数据吻合较好；2)沿隧道长度方向地表位移计算值能够较准确地预测地表最大上浮位移，且在地表上浮位移隆起量减少前与实测数据吻合较好；3)地表隆起位移只在盾尾离开后一段时间内存在，其值先增大后减小，最终趋于0。

关键词: 盾构隧道, 衬砌上浮, 地表隆起, 监测数据

Abstract:

The problem of tunnel lining uplifting and ground surface heave during the excavation of large diameter shield tunnel under shallow overburden has been theoretically investigated with the project of Shanghai South Hongmei Road rivercrossing tunnel. The buoyancy which causes the tunnel lining uplifting is classified into the timedependent static buoyancy of slurry and the dynamic buoyancy generated by grouting. Equivalent formation spring stiffness coefficients are defined for the section where the buoyancy is available and the section where the slurry has hardened, respectively, after which the model of tunnel lining uplifting is established according to the theory of Winkler foundation beam. The resulting lining displacement is used to calculate the squeezing width of the soil above the excavation surface, which is further converted into "reverse loss" of soil formation. And then the uplift curves for ground surface in transverse and longitudinal directions are derived. The results indicate that: (1) The predicted ground surface heave in transverse direction is characterized by normal distribution and matches well with the data measurement. (2) The model accurately predicts the maximum ground surface heave in longitudinal direction and matches well with the data measurement until the heave drops. (3) Furthermore, ground surface heave exists only within a certain period after the shield passes and its value firstly increases and then decreases to zero.

Key words: shield tunnel, tunnel lining uplifting, ground surface heave, monitoring data

中图分类号:

U 45

马蕾, 韩玉琪, 倪静, 汤俊杰, 李林. 浅埋大直径盾构隧道施工期衬砌上浮及地表隆起的模型研究[J]. 隧道建设, 2019, 39(S1): 194-201.

MA Lei, HAN Yuqi, NI Jing, TANG Junjie, LI Lin. Modeling of Tunnel Lining Uplifting and Ground Surface Heave during  Excavation of Large Diameter Shield Tunnel under Shallow Overburden[J]. Tunnel Construction, 2019, 39(S1): 194-201.

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浅埋大直径盾构隧道施工期衬砌上浮及地表隆起的模型研究

Modeling of Tunnel Lining Uplifting and Ground Surface Heave during  Excavation of Large Diameter Shield Tunnel under Shallow Overburden

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