Stress-deformation behavior of ground under excavation and development of new design methods

• Project/Area Number: 10555165
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 展開研究
• Research Field: Geotechnical engineering
• Research Institution: Nagoya Institute of Technology
• Principal Investigator: NAKAI Teruo Nagoya Institute of Technology, Professor, 工学部, 教授 (00110263)
• Co-Investigator(Kenkyū-buntansha): CHOWDHURY E.q. Nagoya Institute of Technology, Research Associate, 工学部, 助手 (60314077) ; ZHANG Feng Gifu University, Associate, 工学部, 助教授 (70303691) ; HASHIMOTO Tadashi Osaka Geo-research Institute, Vice President, 所長代理
• Project Period (FY): 1998 – 1999
• Project Status: Completed (Fiscal Year 1999)
• Budget Amount: ¥4,800,000 (Direct Cost: ¥4,800,000); Fiscal Year 1999: ¥1,400,000 (Direct Cost: ¥1,400,000); Fiscal Year 1998: ¥3,400,000 (Direct Cost: ¥3,400,000)
• Keywords: Retaining wall / Excavation / Constitutive model for soils / Finite element method / Model tests / Earth pressure / Deformation of Ground / モデル実験 / 変形

Research Abstract

Two-dimensional model tests and elastoplastic finite element analysis for excavation problems with braced wall are performed to investigate the influence of construction history , the wall friction, the wall stiffness and the struts on the ground movements and the earth pressure on the wall. Test results show that the surface settlements of the backfill and earth pressure on the wall depend on the deflection process of the wall, even if the final wall deflection are the same. The wall friction, the wall stiffness and the position and stiffness of strut affect significantly the earth pressure on the wall and the ground movement including the surface settlements. The computed results, in which mechanical behavior of soil and structure, behavior of interface between soil and wall and the process of excavation were property taken into consideration, describe well the results obtained in the model tests. Such influence on the deflection of the wall, the earth pressure on the wall and the ground movements including surface settlements under excavation has not been evaluated property in the present design practice.

Research Products

• [Publications] 中井 他: "Model tests and numerical simulation of braced excavation in sandy ground"Soils and Fundation. 39. 1-12 (1999)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] 中井 他: "Simulation of braced excavation considering wall friction and wall stiffness"Proc. 11th ARCSMGE. 1. 329-332 (1999)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] Nakai, T., Kawano, H., Murata, K., Banno, M. and Hashimoto, T.: "Model tests and numerical simulation of braced excavation in sandy ground : influence of construction history, wall friction, wall stiffness, strut position and strut stiffness"Soils and Foundations. Vol. 39, No. 3. 1-12 (1999)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] Nakai, T., Murata, K., Banno, M. and Hashimoto, T.: "Simulation of braced excavation considering wall friction and wall stiffness"Proc. of 11th Asian Conf. on Soil Mechanics and Geotechnical Engineering. Vol. 1. 329-332
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] T.Nakai et al: "Model tests and numerical simulation of braced excavation in sandy ground"Soils and foundations. 39. 1-12 (1999)
• [Publications] T.Nakai et al: "Simulation of braced excavation considering wall friction and stiffness"Proc.of XI ARCSMGE. 1. 329-332 (1999)
• [Publications] T.Hishikawa,T.Nakai & Y.Nishi: "Coupled excavation analyses of vertical cut and slopes in clay"Proc.of IS-Shikoku. 1. 225-231 (1999)
• [Publications] T.Adachi et al: "Soil-water coupling analysis of progressive failure of cut slope using a strain softning model"Proc.of IS-Shikoku. 1. 333-338 (1999)
• [Publications] T.Nakai et. al.: "Model test and numerical simulations of braced excavation in sandy ground" Soils and Foundations. 39・3. (1999)