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

• Geotechnical Engineering • Previous Articles     Next Articles

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. 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

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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

CLC Number: 

  • U 45
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