|Table of Contents|

Study on Failure Mechanism of Excavation Face and Reinforcement Range of Shallow-buried Super Large Diameter Shield Tunnel in Coastal Soft Soil Stratum(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2021年06期
Page:
155-162
Research Field:
软土隧道施工与变形控制
Publishing date:

Info

Title:
Study on Failure Mechanism of Excavation Face and Reinforcement Range of Shallow-buried Super Large Diameter Shield Tunnel in Coastal Soft Soil Stratum
Author(s):
SONG Qi-long1;  QI Wen-rui2;  LI Wen-jing3;  ZHANG Xin-jian4;  SU Dong1; 5; 6; LIN Xing-tao1; 5; 6
(1. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China; 2. China Railway 15th Bureau Group Co., Ltd., Shanghai 200070, China; 3. Zhuhai Dahengqin City New Center Development Co., Ltd., Zhuhai 519030, Guangdong, China; 4. Zhuhai Institute of Urban Planning and Design, Zhuhai 519000, Guangdong, China;
Keywords:
soft soil stratum;  reinforcement range;  super large diameter shield tunnel;  excavation face;  failure mechanism
PACS:
TU312
DOI:
10.19815/j.jace.2021.08054
Abstract:
In order to determine the reasonable range of ground reinforcement and ensure safe construction of shield tunnel in the soft soil stratum, based on Hengqin Mangzhou tunnel project in Zhuhai, the excavation failure mechanism and reasonable reinforcement range for the shallow-buried super large diameter shield tunnel in the soft soil stratum were investigated. The influence of reinforcement range on the active and passive failure forms of the excavation surface and the deformation at the ground surface were studied using the three-dimensional finite element analysis. The results show that as the reinforcement range t increases, the range disturbed by the excavation gradually shrinks, the significant displacement area of the stratum shrinks from the surface to the soil in front of the excavation face, and the failure evolves from the overall-damage mode to the local-damage mode. Compared with that in the case of t=0, the settlement and heaving at the ground surface in the case of t=0.20D(D is tunnel diameter)is reduced by 70%-80%, and the position of the maximum deformation point along the longitudinal direction is basically the same, which is about 0.5D in front of the excavation face. With the increase of t, the adjustable range of excavation face support pressure increases. Compared with t=0,when t=0.20D, the adjustable range is increased by 32.5%, which is conducive to maintaining the stability of the excavation surface during construction. Considering the economy and reinforcement effect, it is reasonable to take the reinforcement thickness of about 0.20D for stratum reinforcement in practical engineering.

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Last Update: 2021-11-01