Rapid Improvement Technique of Shallow Base in Super-Soft Foundation

Abstract:

Dredged soil once was considered as the waste and abandoned, which had resulted in serious environment pollution and high costs. Since the viewpoint of “Utilize Dredged Soil Valuably” was proposed in 1980s, the dredged soil has been used as the hydraulic fills in land reclamation, which can meet the requirements of the booming land expansion. However, most of the fresh hydraulic soil is the floating or fluid mud, and has high water content but little bearing capacity, so it is difficult for the traditional treatment methods to improve the super-soft foundation. Based on the drainage and consolidation theory, the rapid improvement technique without sand cushion for the shallow base was developed and has been applied successfully in engineering practices. The applications showed that the rapid improvement technique improved the bearing capacity of super-soft foundation substantially, and compared with the traditional vacuum preloading method, this new technique is more environment-friendly and cost-saving.

• Periodical: Advanced Materials Research (Volumes 594-597)
• Pages: 401-406
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.594-597.401
• Online since: November 2012
• Authors: Ping Shan Chen
• Keywords: Land Reclamation, Rapid Improvement, Shallow Base, Super-Soft Foundation, Vacuum Preloading

References

[1] Karunaratne G.P, Yong K Y, Tan T S, Tan S A, Liang K M, Lee S L, Vijiaratnam A. Layered clay-sand scheme reclamation at Changi South Bay. Proc of 10th Southeast Asian Geotechnical Canf. Taibei, 1990,11:71-76

[2] Tan T S, Leung C F, Yong K Y. Coastal reclamation projects in Singapore. Proc. Coastal Geotechnical Engineering in Practice, A.Nakase and T.Tsuchida,eds., IS-Yokohama, Japan,2000(2):119-125

[3] Watari Y.Reclamation with clayey soil and method of earth spreading on the surface. Proc. Seminar on soil Improvement and constr. Techinque in soft Ground, Japanese Society of Soil Mechanics and Foundation Engineering,1984,103-119

[4] Lee S L. Karunarane G P, Yong K Y, Ganeshan V 1987. Layered clay-sand scheme of land reclamation. J.Geotech.Engrg. ASCE 1987, 113(9):984-995

DOI: 10.1061/(asce)0733-9410(1987)113:9(984)

[5] Kjellman W. Consolidation of clayey soils by means atmospheric pressure. In Proceedings of a Conference on Soil Stabilization, 1952:258-263.

[6] Zhang Wenquan. Introduction of the methods treating surface layer of new hydraulic fills in Japan.Port & Waterway Engineering, 1984.(04)：128~132(in Chinese).

[7] J.Chu, M. W. Bo, V. Choa. Improvement of ultra-soft soil using prefabricated vertical drains. Geotextiles and Geomembranes,24(2006):339-348.

DOI: 10.1016/j.geotexmem.2006.04.004

[8] Qin Yusheng, Li Zhiyi, Cao Dazheng, Study on the low-location vacuum pre-pressure reinforcement technique. Geoscience, 1999（4）：471~476(in Chinese).

[9] Lian Daren, Cao Dazheng. Study on the low-level vacuum preloading technique treating soft foundation. Port & Waterway Engineering,2000（4）：12~13(in Chinese).

[10] Li Lihui, Wang Qing, Wang Nianxiang, et al. Research on the feasibility of consolidationg hydraulic fill in layers by the method of spatial vacuum drainage. CHINESE JOURNAL OF GEOTECHNICAL ENGINEERING, 2002(4)：522-524(in Chinese).