平行小净距盾构与CRD法黄土地铁隧道施工力学研究

›› 2011, Vol. 32 ›› Issue (2): 516-524.

平行小净距盾构与CRD法黄土地铁隧道施工力学研究

孔祥兴^{1, 2, 3}，夏才初^{1, 2}，仇玉良³，张丽英³，龚建伍⁴

1.同济大学地下建筑与工程系，上海 200092；2.同济大学岩土及地下工程教育部重点实验室，上海 200092； 3.中交第一公路勘察设计研究院，西安 710075；4.武汉科技大学城市建设学院，武汉 430070

收稿日期:2010-05-12 出版日期:2011-02-10 发布日期:2011-02-16
作者简介:孔祥兴，男，1981年生，博士研究生，主要从事隧道与地下工程方面的研究和设计工作。
基金资助:
国家科技支撑计划“城市地下空间建造技术研究”（No.2006BAJ27B02–02）；中国交通建设集团科技研发项目“轨道信息化集成设计系统” （No. 2007-ZJKJ-A-08）。

Study of construction mechanical behavior of parallel-small spacing metro tunnels excavated by shield method and cross diaphragm (CRD) method in loess region

KONG Xiang-xing^{1, 2, 3}, XIA Cai-chu ^{1, 2}, QIU Yu-liang3, ZHANG Li-ying3, GONG Jian-wu⁴

1. Deparment of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3.The First Highway Survey and Design Institute of China Communications Construction Company Ltd., Xi’an 710075, China; 4. School of City Construction, Wuhan University of Science and Technology, Wuhan 430070, China

Received:2010-05-12 Online:2011-02-10 Published:2011-02-16

摘要/Abstract

摘要：

西安轨道交通工程是目前首例在我国黄土地区修建的地铁隧道，一号线枣园北路站至汉城路站K12+792.744～K12+889.899区间隧道为同时满足双线正常行车和右线停车线扩大断面的功能需要，选取了左线小断面隧道为盾构法与右线大断面隧道为CRD法相结合的施工方案。针对该地铁隧道的施工过程，进行了三维动态数值模拟和施工力学分析，通过分析施工引起的地表变形、中间土体应力和围岩塑性区的特征和规律，从而研究得出CRD法与盾构法隧道先后施工相互影响的规律性成果：先行大断面隧道采取CRD法施工对后行小断面盾构隧道上方地表沉降的影响较后者对前者的影响大；后行隧道的贯通使得先行隧道开挖形成的地表变形轴线向后行隧道侧偏移了约0.5倍净距，并且地表变形的横向影响范围和地表沉降量均有增大，主要表现在靠后行隧道一侧；先行大断面隧道的开挖较后者对中间土体应力影响大，对相邻洞土体的影响在同掌子面处最为显著。结合西安地铁隧道工程实践开展的数值模拟分析研究，可为今后在黄土地区修建地铁隧道提供具有指导意义的研究成果和宝贵的工程实践经验。

关键词: 小净距, 黄土地铁隧道, 盾构法, CRD法, 地表变形, 数值模拟

Abstract:

Abstract: Urban rail transit in Xi’an is the first metro tunnel constructed in loess region in China. In order to meet the functional requirements of double line normal running and enlarged inner section of the right stabling yard in line 1 between North Zaoyuan Road and Hancheng Road(K12+792.744-K12+889.899), construction scheme with the combination of shield method and cross diaphragm (CRD) method is chosen, in which the left tunnel with small inner section is excavated by shield method and the right one with large inner section is constructed by CRD method. 3D-FEM model is established to analyze the construction process and mechanical behaviors. According to the results of the finite element analysis, the settlements of the ground, the stress distribution in the middle soil pillar and the development of plastic zones in the surrounding rocks are discussed. Based on the discussions, the reciprocal influences of construction sequences on the two neighboring tunnels excavated by shield method and CRD method respectively are demonstrated. It is shown that the excavation of anteceding tunnel with large cross-section by CRD method has greater influences on the ground settlement above the subsequent tunnel with small cross-section. In addition, the transfixion of the subsequent tunnel results in the ground settlement axis formed during the excavation of the anteceding tunnel offsetting a distance about a half of the net spacing toward the subsequent tunnel; and the ground settlement caused by the anteceding tunnel excavated increases near the side of the subsequent tunnel. Furthermore, the stress of middle soil pillar is influenced more significantly by the excavation of the anteceding tunnel with large cross-section than that of the subsequent tunnel with small cross-section; and the greater interactive influence caused by parallel tunnels exists near the same excavating face. The research results based on the metro project in Xi’an city will provide valuable practice experiences and worthful research achievements for future construction of other metro tunnels in loess region.

Key words: small clear spacing, metro tunnel in loess region, shield method, cross diaphragm (CRD) method, ground surface deformation, numerical simulation

中图分类号:

U 45

孔祥兴，夏才初，仇玉良，张丽英，龚建伍. 平行小净距盾构与CRD法黄土地铁隧道施工力学研究[J]. , 2011, 32(2): 516-524.

KONG Xiang-xing, XIA Cai-chu, QIU Yu-liang, ZHANG Li-ying, GONG Jian-wu. Study of construction mechanical behavior of parallel-small spacing metro tunnels excavated by shield method and cross diaphragm (CRD) method in loess region[J]. , 2011, 32(2): 516-524.

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