砂土地层中隧道施工引起土层沉降的颗粒流模拟研究

王正兴; 施 焱

doi:10.3973/j.issn.1672-741X.2016.02.006

隧道建设 >

2016 , Vol. 36 >Issue 2: 158 - 163

DOI: https://doi.org/10.3973/j.issn.1672-741X.2016.02.006

研究与探索

砂土地层中隧道施工引起土层沉降的颗粒流模拟研究

王正兴 ,
施焱

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(南通城市建设集团有限公司，江苏南通 226100)

王正兴（１９８１—），男，江苏南通人，2004年毕业于吉林大学，土木工程专业，博士，工程师，现从事盾构隧道施工对地面沉降及埋地管线性状影响的研究工作。Email: johnston_2002@163.com。

收稿日期: 2015-08-21

修回日期: 2015-10-25

网络出版日期: 2016-03-02

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Study on Ground Settlement Induced by Tunneling in Sandy Strata Using PFC2D

WANG Zhengxing ,
SHI Yan

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（Nantong Urban Construction Group Co., Ltd., Nantong 226100, Jiangsu, China）

Received date: 2015-08-21

Revised date: 2015-10-25

Online published: 2016-03-02

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摘要

为研究隧道施工条件下土层的沉降规律，利用离散元软件PFC2D，建立隧道-土体颗粒流数值模型，模拟砂土地层隧道施工过程中的土层沉降。研究结果表明：通过设计，颗粒流方法可有效模拟隧道施工的开挖问题；土拱效应的发挥程度与地层损失率成正比，同时土层剪应变率呈现由隧道中轴线向两侧逐渐减小、由深层向浅层逐渐展开的分布规律。分析结果可为工程实践中分析砂土地层隧道施工引起的土体沉降规律提供理论依据。

关键词： 砂土地层; 隧道施工; 沉降; 颗粒流模拟; 土拱效应; 地层损失率

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王正兴 , 施焱 . 砂土地层中隧道施工引起土层沉降的颗粒流模拟研究[J]. 隧道建设, 2016 , 36(2) : 158 -163 . DOI: 10.3973/j.issn.1672-741X.2016.02.006

Abstract

A numerical model of tunnelsoil is established by means of PFC2D (Particle Flow Code) discrete element software, so as to simulate the ground settlement induced by tunneling. The study results show that: 1) The PFC2D can be considered as an effective way to simulate the tunnel excavation. 2) The effect of soil arch is proportional to the ground loss. 3) The shear strain rate of sandy strata decreases gradually from the medial axis to the side and increases gradually from deep soil to shallow soil during tunneling. The analysis results can provide theoretical reference for study on ground settlement induced by tunneling in sandy strata.

Key words： sand strata; tunneling; settlement; PFC2D; soil arching effect; ground loss rate

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