摘要
大型龙口因水流流速大、流态复杂、基础土体易发生冲刷等原因,其护底保护对于顺利合龙起着关键作用。本文提出一种新型双层错缝搭接组合排护底技术,下层铺设砂肋软体排防止水流掀动,上层铺设砼联锁片软体排起到保土作用,形成上下两层软体排错缝搭接的保守护底结构。数值模拟和力学计算结果表明,与传统的单层砼排/单层砂肋排相比,双层组合排在水流作用下能够保持更高的稳定性,临界抗掀流速可达单层排的1.5倍。横沙八期工程应用效果表明,在合龙过程中双层组合排护底结构均保持完整,对滩面起到了很好的防护作用,有效提升了大型龙口施工的抗风险能力。
Due to the high water flow velocity,complex flow patterns,and easy erosion of the foundation soil,the bottom protection of large dragon mouths plays a crucial role in the smooth closure.This article proposes a new type of double-layer staggered joint combination bottom protection technology.The lower layer is laid with sand rib soft row to prevent water flow from lifting,and the upper layer is laid with concrete interlocking sheet soft row to protect soil,forming a conservative bottom protection structure with staggered joint overlap between the upper and lower layers of soft row.The numerical simulation and mechanical calculation results show that compared with traditional single-layer concrete row/single-layer sand rib row,double-layer composite row can maintain higher stability under water flow,and the critical anti lift flow velocity can reach 1.5 times that of single-layer row.The application effect of the Hengsha Phase 8 project shows that the double-layer combination bottom protection structure remains intact during the closure process,providing good protection for the beach surface and effectively improving the risk resistance ability of large-scale dragon mouth construction.
作者
刘强
孙正
LIU Qiang;SUN Zheng(Shanghai Transportation Construction General Contracting Co.,Ltd.,Shanghai 200136,China)
出处
《价值工程》
2024年第16期52-55,共4页
Value Engineering
关键词
大型龙口
合龙
双层护底
横沙东滩
large dragon mouth
closure
double layer bottom protection
Hengsha Dongtan
