大面积吹填工程滩涂地基与护岸的监测分析  

Monitoring and analysis of tidal flat foundation and revetment in large area reclamation project

作　　者：唐彤芝[1] 郑智富 徐杨 张添烨[3] TANG Tong-zhi;ZHENG Zhi-fu;XU Yang;ZHANG Tian-ye(Nanjing Hydraulic Research Institute,Nanjing 210029,Jiangsu,China;Ningde Zhangwan Lingang Industrial Zone Development and Construction Co.,Ltd.,Ningde 352000,Fujian,China;Hohai University,Nanjing 210098,Jiangsu,China)

机构地区：[1]南京水利科学研究院,江苏南京210029 [2]宁德市漳湾临港工业区开发建设有限公司,福建宁德352000 [3]河海大学,江苏南京210098

出　　处：《地基处理》2023年第3期221-227,261,共8页Journal of Ground Improvement

摘　　要：在大面积滨海滩涂场地进行吹填形成陆域,需要重点关注淤泥地基与围挡结构的变形稳定。通过某填海造地工程的现场监测,分析了大面积吹填砂荷载作用过程中滩涂地基的表面沉降、单侧临空的狭长土质护岸的深层水平位移的变化过程及特性。结果表明,陆域形成后淤泥表面沉降速率为0~3 mm/d,护岸深层水平位移速率为0~2 mm/d,淤泥地基与护岸处于稳定状态。大面积场地内淤泥表面沉降量的差异较大,标准差为297 mm,变异系数达到0.37。初期沉降量的占比达到30%~60%,平均为47.8%。填土预压期间护岸的深层水平位移量超过吹填施工期间,两者的比值达到1.1~2.6,反映了两个阶段的荷载性质、作用方式与施加过程的影响以及土体变形的累积特性。验证了预留吹填边界距离,实施分块超高快速吹填、逐步推进的施工方案是合理的。It is necessary to pay more attention to the deformation stability of the silt foundation and retaining structure in the large area of coastal tidal land.Through the field monitoring of a reclamation project,the change process and characteristics of the surface settlement of the tidal flat foundation and the deep horizontal displacement of the one-sided narrow soil revetment under the large area sand dredging process are analyzed.The results show that after the formation of the land area,the sedimentation rate of the silt surface and the horizontal displacement rate of the deep layer of the revetment are 0-3 mm/d and 0-2 mm/d,respectively.The silt foundation and revetment are in a stable state.The surface settlement of silt in large-area sites varies greatly,with a standard deviation of 297 mm and a variation coefficient of 0.37.The initial settlement accounted for 30%-60%of the entire settlement,with an average of 47.8%.The deep horizontal displacement of revetment during soil filling preloading is higher than that during soil filling construction,and the ratio is 1.1-2.6,which reflects the load nature,action mode and application process of the two stages,as well as the cumulative characteristics of soil deformation.It has been verified that it is reasonable to reserve the distance of filling boundary,implement the block construction and step by step scheme of ultra-high speed filling.

关 键 词：吹填 淤泥地基 护岸 沉降 水平位移 

分 类 号：TU47[建筑科学—结构工程]