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| Experimental Study on Improvement of Foundations with New Hydraulic Fill Muck |
| ZHU Qun － feng，WANG Zhang － chun，GAO Chang － sheng，ZHANG Ling，YANG Shou － hua |
| Geotechnical Engineering Department of Nanjing Hydraulic Research Institute，Nanjing，Jiangsu 210024，China |
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Abstract Research purposes: The foundation with new hydraulic fill muck is characterized by high water content，high compressibility and weak strength of about zero． At present，the treatment of such special kind of foundation is a troublesome problem in land reclamation projects in coastal areas． In order to explore the effective methods for the foundation treatment and to provide technical support for the project construction in the coastal areas，the geosynthetic materials such as drainage plates with small intervals and geogrids are employed to improve the in － situ foundation combined with surcharge pre － loading． The vane strength of the new hydraulic fill muck should be larger than 10 kPa after reinforcing the foundation according to the design requirements．
Research conclusions: The test results indicate that the observed settlement of the foundation is up to 1800 mm，and the mean consolidation degree of the foundation is 95%． The observed horizontal displacement is very small． During the whole loading process，the foundation has been in the state of safety． It is shown that the treatment scheme for the foundation is rational and feasible． The observed vane strength of the new hydraulic fill muck of the foundation reaches 12 kPa after improvement． The soil indices of the new hydraulic fill muck are improved to some extent． The anticipative efficiency is achieved for the foundation improvement． The utilization of geosynthetic materials such as geogrids successfully solves the technical problem of difficulty of direct surcharge on the new hydraulic fill muck，and it can be further popularized in similar projects． The per － unit － thickness compression amount of the foundation with new hydraulic fill muck is larger than 200 mm/m，indicating that the compressive deformation of the new hydraulic fill muck belongs to large deformation problems and it should be considered in theoretical calculations．
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Received: 20 May 2011
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2011, Vol. 28 
