天津滨海新区吹填造陆浅层超软土加固技术研发及应用

 对于新近吹填淤泥形成的超软土地基，常规软基处理方法难以取得理想加固效果或根本无法实施。为适应天津滨海新区大面积吹填造陆的需要，针对当地吹填超软土的工程特性，研发出一种适合于天津滨海新区的浅层超软土加固技术，详细介绍该技术的加固目的、技术方案、工艺要点及其工程应用情况。依托天津滨海新区中船重工造修船基地造船B区软基处理工程，结合各种监测检测成果，评价其加固效果并分析其中原因，同时指出该技术尚存在的问题。工程实践表明，经过该技术处理的吹填淤泥，浅层土体含水率大幅降低，物理力学性质明显改善，表层形成一层具有一定承载力的硬壳层，完全可以满足后续吹填砂垫层和机械插板的施工要求，工程应用成功，同时该技术具有成本低、工期短、工艺简单等特点，值得推广。

RESEARCH AND APPLICATION OF IMPROVEMENT TECHNOLOGY OF SHALLOW ULTRA-SOFT SOIL FORMED BY HYDRAULIC RECLAMATION IN TIANJIN BINHAI NEW AREA

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.