Advertisement

Deformation Characteristics Analysis of Supporting Structure Caused by Deep Excavation of Large-Span Subway Parking Lot in Deep Silt Stratum

  • Yalin Yu
  • Ke WuEmail author
  • Shuaishuai Cui
  • Qianjin Zhang
  • Jiahui Zhao
  • Zheng Zhang
Original Paper
  • 34 Downloads

Abstract

With the rapid development of China’s economy and the continuous improvements in urban modernization, the high-rise buildings, subways, civil defense fortifications, underground substations, underground storage, and other projects have increased, and the subsequent foundation pit projects, especially deep foundation pit engineering, have grown as well. Concurrently, the technical challenges and construction risks faced by deep foundation pit engineering have increased, especially in the coastal soft soil areas along rivers, due to the extremely fragile and sensitive geological environment. For this purpose, the ABAQUS finite element simulation software was used for numerical simulation analysis to study the influencing factors and the deformation rate of the diaphragm wall and aimed at different failure mechanisms of instability of deep foundation pit projects in the Yitian Parking Lot of Shenzhen Metro Line 10. Moreover, preventive measures for the deformation of supporting structures were proposed. The results showed that: (1) In the engineering mechanical properties of marine soft soil, deformation of the diaphragm wall is sensitive to the changes in the e-lnp rebound curve slope \( \upkappa \) and Poisson’s ratio v; moreover, the maximum surface settlement behind the wall is sensitive to changes in the critical state parameter M and Poisson’s ratio v. (2) A mechanical analysis model for diaphragm wall was established. All the external conditions are regarded as generalized loads or foundations. Furthermore, the interaction between the diaphragm wall and the soil is considered, which is closer to the actual situation. (3) The elasto-viscoplastic model of soft soil by Borja was established, and the deformation rate formula of the diaphragm wall was proposed.

Keywords

Silty clay Deep foundation pit Deformation rate Influencing factors MCC model 

References

  1. 1.
    Terzaghi K (1943) Theoretical soil mechanics. Wiley, New YorkCrossRefGoogle Scholar
  2. 2.
    Milligan GWE (1983) Soil deformations near anchored sheet-pile walls. Geotechnique 33(1):41–55CrossRefGoogle Scholar
  3. 3.
    Peck RB (1969) Deep excavations and tunneling in soft ground. In: 7th ICSMFE, state-of-the-art, pp 225–290Google Scholar
  4. 4.
    Lambe TW, Turner CK (1970) Braced excavation, Lateral stress in ground and design of Earth-retaining structure. ASCE, pp 149–218Google Scholar
  5. 5.
    Hou X, Chen Y (1989) Computer of ground settlement surrounding the depth foundation pit. Geotech Eng 1(1):3–13 (in Chinese) Google Scholar
  6. 6.
    Li J (1992) Three dimensional FEM and experiment for the concrete diaphragm wall in foundation pit in soft clay. Tongji University, Shanghai (in Chinese) Google Scholar
  7. 7.
    Tao M (1996) Discussion for excavation deformation of foundation pit in Nanjing. Build Struct 4:20–24 (in Chinese) Google Scholar
  8. 8.
    Li Y (1999) Analysis of displacement filed around the foundation pit and dynamic control. Tongji University, Shanghai (in Chinese) Google Scholar
  9. 9.
    Yang G (2000) A study on deep excavation and protection of its surrounding buildings. Tongji University, Shanghai (in Chinese) Google Scholar
  10. 10.
    Jian Y (2001) Computation and study on the deflection of the braced structure and its affection factors in excavation of soft soil. Hehai University, Nanjing (in Chinese) Google Scholar
  11. 11.
    Gao W, Shen P (2002) Influence on strata deformation for staged construction of excavation in soft clay. J Xiangtan Min Inst 17(1):1–4 (in Chinese) Google Scholar
  12. 12.
    Lin H-D, Ou C-Y (2002) Time-dependent displacement of diaphragm, wall induced by soil creep. J Chin Inst Eng 25(2):223–231CrossRefGoogle Scholar
  13. 13.
    Borja RI, Lee SR (1990) Cam-clay plasticity, part I: implicit integration of elasto-plastic constitutive relations. Comput Methods Appl Mech Eng 78(1):49–72CrossRefGoogle Scholar
  14. 14.
    Borja RI (1992) Generalized creep and stress relaxation model for clays. J Geotech Eng ASCE 118(11):1765–1786CrossRefGoogle Scholar
  15. 15.
    Zhong H (2003) Theoretical study on structural and creep characteristics of soft soil. Tongji University, Shanghai (in Chinese) Google Scholar

Copyright information

© Indian Geotechnical Society 2019

Authors and Affiliations

  • Yalin Yu
    • 1
  • Ke Wu
    • 1
    Email author
  • Shuaishuai Cui
    • 1
  • Qianjin Zhang
    • 1
  • Jiahui Zhao
    • 1
  • Zheng Zhang
    • 1
  1. 1.Shandong UniversityJinanChina

Personalised recommendations