无围堰吹填技术在连云港某岸线修复工程的应用  

Application of hydraulic reclamation technology without cofferdam in shoreline restoration project in Lianyungang

作　　者：顾宽海 李海玲 王家宁 谢立全[3] GU Kuanhai;LI Hailing;WANG Jianing;XIE Liquan(CCCC Third Harbor Consultants Co.,Ltd.,Shanghai 200032,China;CCCC TDC Yantai Environmental Protection Dredging Co.,Ltd.,Yantai 264000,China;Department of Hydraulic Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]中交第三航务工程勘察设计院有限公司,上海200032 [2]中交烟台环保疏浚有限公司,山东烟台264000 [3]同济大学水利工程系,上海200092

出　　处：《水运工程》2023年第8期190-196,共7页Port & Waterway Engineering

基　　金：国家自然科学基金项目(11172213)。

摘　　要：无围堰吹填技术是开敞海域最理想的快速吹填成陆工艺,结合成熟的无围堰砂土吹填经验,研发高效、可靠的无围堰黏土吹填技术是提升淤泥质开敞海域吹填效率的重要方向。依托连云港某岸线修复工程,提出采用团块状硬质土泥饼取代传统泥浆材料的无围堰吹填技术,并通过现场试验段的多方案对比与施工参数的反复调整,提升了吹填土体自然排水与沉降效率。结果表明,基于黏土团块吹填技术所形成的土层在吹填后4~5 d内迅速沉降,主固结基本完成,施工机械可安全进入吹填区域;经过两个半月的自然固结沉降,吹填地基的承载力可达到45 kPa以上。黏土团块吹填技术能快速成陆,利于节能减碳、生态环保,具有良好的应用前景。The hydraulic reclamation technology without cofferdam is the most ideal and rapid process for land formation in open sea areas.According to mature experience in hydraulic reclamation of sandy soil without cofferdam,developing efficient and reliable hydraulic reclamation technology of clay without cofferdam is an important direction to improve the efficiency of hydraulic reclamation in open sea areas with muds.Based on a shoreline restoration project in Lianyungang,this paper proposes the hydraulic reclamation technology without cofferdam,in which the traditional mud material is replaced by a lump hard earth cake.In addition,the paper compares multiple schemes in the field test section,repeatedly adjusts construction parameters,and improves the natural drainage and settlement efficiency of soil by hydraulic reclamation.The results show that the soil layer formed based on the hydraulic reclamation of clay lumps settles rapidly within 4-5 d after hydraulic reclamation,and the main consolidation is basically completed,enabling the construction machinery to enter the site safely.After 2.5 months of natural consolidation and settlement,the bearing capacity of the foundation by hydraulic reclamation can reach more than 45 kPa.The hydraulic reclamation of clay lumps facilitates land formation,and it is conducive to energy saving,carbon reduction,and ecological and environmental protection,thus having a good application prospect.

关 键 词：团块状黏土 吹填 快速成陆 地基承载力 

分 类 号：U651[交通运输工程—港口、海岸及近海工程]