富水软弱地层中浅埋暗挖隧道施工地表沉降分析&mdash;&mdash;以杭州紫之隧道为例

邹金杰; 陈钢; 甘鹏路; 沈耀剑

doi:10.3973/j.issn.1672-741X.2017.02.004

隧道建设 >

2017 , Vol. 37 >Issue 2: 141 - 149

DOI: https://doi.org/10.3973/j.issn.1672-741X.2017.02.004

研究与探索

富水软弱地层中浅埋暗挖隧道施工地表沉降分析——以杭州紫之隧道为例

邹金杰 ,
陈钢 ,
甘鹏路 ,
沈耀剑

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(1. 中国电建集团华东勘测设计研究院有限公司，浙江杭州 311100； 2. 杭州市勘测设计研究院， 浙江杭州 310012； 3. 浙江大学建筑工程学院，浙江杭州 310058； 4. 浙江科技学院土木与建筑工程学院，浙江杭州 310023)

邹金杰(1980—)，男，浙江湖州人，2006年毕业于西南交通大学，桥梁与隧道工程专业，硕士，高级工程师，主要从事工程的设计与管理研究工作。Email: zou_jj@ecidi.com。*通信作者：甘鹏路，Email: dennis19900828@163.com。

收稿日期: 2016-09-23

修回日期: 2016-11-22

网络出版日期: 2017-03-04

基金资助

华东勘测设计研究院科技项目(KY2013-02-30)

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Analysis of Ground Surface Settlements Induced by Construction of Shallowcovered Mined Tunnel in Waterrich and Softweak Strata: A Case Study of Zizhi Tunnel in Hangzhou

ZOU Jinjie ,
CHEN Gang ,
GAN Penglu ,
SHEN Yaojian

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(1. HydroChina Huadong Engineering Corporation, Hangzhou 311100, Zhejiang, China; 2. Hangzhou Survey and Design Institute, Hangzhou 310012, Zhejiang, China; 3. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, Zhejiang, China; 4. School of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou 310023, Zhejiang, China)

Received date: 2016-09-23

Revised date: 2016-11-22

Online published: 2017-03-04

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摘要

为深入了解富水软弱地层中浅埋暗挖隧道施工引起的地表沉降特征，以杭州紫之隧道北口浅埋暗挖段工程为依托，采用现场监测数据分析与数值模拟计算相结合的方法，分析地下水渗流作用对地表沉降的影响。分析结果表明： 1）在地下水渗流作用下，横向和纵向地表沉降槽宽度系数的拟合值均大于文献中对黏土的建议值； 2）在隧道施工过程中，地层孔压下降范围逐渐扩大，地下水渗流是沉降槽宽度增加的主要原因； 3）地表沉降主要发生在隧道外侧起拱线处、与水平方向成45°+φ/2的斜线之间区域（φ为隧道上覆土层平均内摩擦角）。

关键词： 紫之隧道; 浅埋暗挖隧道; 地表沉降; 沉降槽; 流固耦合

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邹金杰 , 陈钢 , 甘鹏路 , 沈耀剑 . 富水软弱地层中浅埋暗挖隧道施工地表沉降分析——以杭州紫之隧道为例[J]. 隧道建设, 2017 , 37(2) : 141 -149 . DOI: 10.3973/j.issn.1672-741X.2017.02.004

Abstract

The effect of groundwater seepage on ground surface settlement of shallowcovered mined section of Zizhi Tunnel in Hangzhou in waterrich and softweak strata and the ground surface settlement characteristics are analyzed by site monitoring data analysis and numerical simulation calculation method. The analytical results show that: 1) Under the action of groundwater seepage, the fitting results of the transverse and longitudinal ground surface settlements are larger than the suggested values in existing researches. 2) The region where pore pressure drops gradually amplifies during tunnel construction; and the groundwater seepage is the main cause for the increase of settlement trough width. 3) The ground surface settlement mainly occurs in the region between two inclined lines, which are located at the springline and have an inclined angle of 45°+φ/2 to the horizontal direction,where φ is the average friction angle of the overlying ground.

Key words： Zizhi Tunnel; shallowcovered mined tunnel; ground surface settlement; settlement trough; solidfluid coupling analysis

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