Consolidation Settlement Analyses on a Composite Foundation System Combined with Walled and Columniform Soil Improvement

Abstract:

To satisfy the geotechnical strength requirements and the serviceability requirements, types of foundation systems (such as shallow foundation, pile foundation and composite foundation) have been developed. Of course, the type of foundation system is determined by many factors such as ground condition, economy and environmental influence of construction. To cope with weak or compressible soils, the authors present a raft foundation system with walled and columniform soil improvement for multistory buildings, which is economical and environment-friendly. In this raft foundation system, different columniform soil improvements in size and depth are used, and the subgrade under the edge of the foundation is walled by soil improvement. It can effectively control differential settlement and prevent relative rising of the structure by adjusting the size and depth of columniform soil improvements according to the soil layer difference of geological situation under the building. We have performed series numerical analyses under two-dimensional plane strain condition to study the settlement behaviors of the composite foundation system, and its effects on controlling differential settlement and improving bearing capacity were verified for immediate condition. As a continuous research, consolidation settlement analyses are performed, the process of excess hydraulic pressure dispersion with time and the consolidation settlement development are studied in this paper.

• Periodical: Advanced Materials Research (Volumes 163-167)
• Pages: 2318-2327
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.163-167.2318
• Online since: December 2010
• Authors: Wei Li, Fei Gao, He Huang, Haruyuki Yamamoto, Kinji Takeuchi
• Keywords: Consolidation, Differential Settlement, Numerical Analysis, Soil Improvement

References

[1] Tomono, M., Kakurai, M. and Yamashita, K.: Analysis of settlement behavior of piled raft foundations, Takenaka Technical Research Report, No. 37 (1987), pp.115-124 (in Japanese).

[2] Kitiyodom, P. and Matsumoto, T.: A simplified analysis method for piled raft foundations in non-homogeneous soils, Int. Journal of Numerical and Analytical Methods in Geomechanics, Vol. 27 (2003), pp.85-109.

DOI: 10.1002/nag.264

[3] Hibino, S. and Inoue, Y.: Field tests for elucidate the vertical bearing mechanism of soil-cement-column which located some pich under the base (results of vertical loading tests), Summaries of Technical Papers of Annual Meeting, Architectural Institute of Japan, B-1 (2001).

[4] Sahara, M. and Chatani, F.: A large scale storehouse on raft foundation in combination with improved soil by shallow mixing method, Summaries of Technical Papers of Annual Meeting, Architectural Institute of Japan, B-1 (2004).

[5] W. Li, K. Takeuchi, and H. Yamamoto: Numerical study on effect of shallow soil improvement to control differential settlement of raft foundation, Proceedings of AIJ Tyugoku Chapter Architectural Research Meeting　(2005), pp.133-136 (in Japanese).

[6] H. Yamamoto, W. Li and K. Takeuchi: A New raft foundation system with shallow soil improvement, Third International Structural Engineering and Construction Conference (2005), pp.797-804.

[7] W. Li, K. Takeuchi, and H. Yamamoto. Effect of raft foundation with shallow soil improvement on controlling differential settlement, Proceeding of the Second China-Japan Geotechinical Symposium (2005), pp.350-357.

[8] W. Li, K. Takeuchi, H. Yamamoto: Analytical study on nonlinear behavior of a new raft foundation system，Proceedings of the fourth international structural engineering and construction conference (2007), pp.1075-1080.

[9] Li Wei, Li Feng, Takeuchi Kinji, Yamamoto Haruyuki: Numerical Analysis on a New Foundation System with Columniform Soil Improvement, New Frontiers in Chinese and Japanese Geotechniques, edtied by Yangping Yao, Hirokazu Akagi and Ga Zhang, China Communications Press (2007).