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Abstract Conventional improvement methods of soft ground are ineffective or unpractial for ultra-soft soil formed by newly hydraulic mud fill. To meet the requirements of large-area reclamation by pumping filling in Tianjin Binhai New Area，a new improvement technology of shallow ultra-soft soil was proposed in connection with its engineering characteristics. It was introduced including the purpose，technical program，process points and application. Relying on a project in Tianjin Binhai New Area，the improvement effect was evaluated and the reasons and problems were analyzed with monitoring test results. Engineering practice shows that the water content of shallow soil reduces greatly；and its physico-mechanical properties are improved significantly after treated by the technology. A hard crust with a certain bearing capacity forms，which fully meets the construction requirements of hydraulic fill sand cushion and prefabricated vertical drains. The technology was applied successfully which has characteristics of low cost，short construction period and simple process and it is worth popularizing.
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Received: 20 January 2011
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2011, Vol. 30 
