天津滨海新区浅层超软土加固技术现场对比试验

分析天津滨海新区浅层超软土加固处理存在的问题，提出常规方案、单排单管方案和单排单管加密方案。依托天津滨海新区某工程，开展现场对比试验。结合各种监测检测成果，对比分析3种方案加固效果，并提出进一步优化改进建议。工程实践表明，经过3种方案加固处理，吹填淤泥表层会形成具有一定强度和厚度的硬壳层，土体物理力学性质明显改善，均能满足后续吹填砂垫层和机械插板的施工要求。另外，单排单管方案和加密方案加固效果明显优于常规方案，尤其有利于硬壳层厚度的形成。从长远加固效果角度出发，单排单管方案及加密方案更可取。

Field comparison test of reinforcement technology of shallow ultra-soft soil in Tianjin Binhai New Area

Some problems of reinforcement of shallow ultra-soft soil in Tianjin Binhai New Area are analysed.Three reinforcement schemes of shallow ultra-soft soil are proposed,including conventional scheme,single-row to single-tube scheme and small spacing scheme.Relying on a project in Tianjin Binhai New Area,field comparison test is carried out.A comparative analysis of the reinforcement effect of three schemes is done with monitoring test results and some further recommendations for reinforcement are provided.Engineering practice shows that,a hard crust with a certain strength and thickness forms after treated by three reinforcement schemes and the physico-mechanical properties of soil are significantly improved,which fully meet the construction requirements of hydraulic fill sand cushion and prefabricated vertical drains.In addition,the reinforcement effects of single-row to single-tube scheme and small spacing scheme are significantly better than that of conventional reinforcement scheme.The first two schemes are beneficial to the formation of hard crust thickness,which are preferable from the point of view of long-term perspective.