大型龙口软土地基快速处理关键技术

Key technology of rapid treatment of soft foundation in large gap

针对大型龙口的流泥及淤泥土层等软弱地基抗剪强度指标低、抗滑稳定和沉降控制难度大、不能满足合龙要求的问题,进行了横沙东滩圈围(八期)工程的流泥及新淤积软土地基合龙方案的分析研究。采用理论分析结合数值模拟计算方法,提出同一龙口位置深厚流泥打设排水板、薄层流泥碎石置换以及通长袋加筋的组合式地基处理方法,使大型龙口的软弱地基土在短时间内强度大幅度提高,满足了合龙要求。研究成果可为类似工程的施工设计提供新思路。

In view of the problems of low shear strength index of soft foundation in large gap such as fluid mud and silt soil layer,difficulty of anti-sliding stability and settlement control,which can not meet the requirements of closure,this paper studies the closure scheme of fluid mud and fresh silted soft soil foundation of Hengsha Dongtan Circle(Phase 8)project.Based on theoretical analysis and numerical simulation calculation method,it proposes the combined foundation treatment method of drainboard installation in deep mud,thin layer mud gravel replacement and long bag reinforcement at the same gap.The strength of gap foundation soil is greatly improved in the short term and meets the closure requirements.The research results can provide new ideas for construction design of similar projects.