ISSN 2096-4498

   CN 44-1745/U

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Tunnel Construction ›› 2017, Vol. 37 ›› Issue (5): 593-599.DOI: 10.3973/j.issn.1672-741X.2017.05.011

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Analysis of Deformation of Yezhushan Highway Tunnel Construction Based on Analysis of Controlled Deformation in Rocks and Soils (ADECORS)

TAN Shi1, 2, DING Wenqi1, 2, LIU Cheng1, 2, LIU Ting3, GUO Hongyu4   

  1. (1. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering (Tongji University), Ministry of Education, Shanghai 200092, China; 3. Ningbo Highway Construction Bureau, Ningbo 315192, Zhejiang, China; 4. Zhejiang Provincial Institute of Communications Planning Design & Research, Hangzhou 310006, Zhejiang, China)
  • Received:2016-09-14 Revised:2017-02-22 Online:2017-05-25 Published:2017-06-08

Abstract:

ADECORS (analysis of controlled deformation in rocks and soils) method is used in Ningbo Yezhushan Highway Tunnel with shallow buried depth and weak surrounding rock. The abovementioned method is hardly used in highway tunnel construction in China. Based on the analysis of numerical simulation and field monitoring, some results are obtained as follows: 1) As for surface subsidence of Yezhushan Tunnel, the spatial effect of excavation is 0.6 times the span and the settlement area can be divided into 3 parts, namely, sensitive area, sensitive transition area, and stable area. 2) The spatial effect of excavation on tunnel crown top settlement is almost a span and 60% of crown top settlement occurs before tunnel face reaches monitoring section. 3) Threedimensional morphology of Yezhushan Tunnel face extrusion is outer convex parabolic; lap length of fiberglass bolt is suggested to be 6 m and the development of extrusion deformation is segmented into three stages.

Key words: highway tunnel, ADECORS, construction deformation, advanced core soil, fiberglass bolt, numerical simulation, monitoring analysis

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