长江口南导堤S5+000～S6+700段局部堤身下沉原因与修复设计  

Cause of abnormal local settlement of section S5+000～S6+700 of southern training bank in the Yangtze Estuary and restoration design

作　　者：陈琳 季岚 

机构地区：[1]中交上海航道勘察设计研究院有限公司,上海200120

出　　处：《水运工程》2010年第4期95-99,共5页Port & Waterway Engineering

摘　　要：通过现场调查和河势分析发现长江口南导堤S5+000～S6+700段局部堤身下沉的原因是南导堤修建后使得江亚北槽水流运动受阻,形成强劲的沿堤水流,其长期作用使得一期工程时搭接长度相对不足的部分护底软体排搭接处泥沙流失,最终引起堤身下沉破坏。据此,修复设计中加强了护底软体排结构安全保障,取得了良好效果。Through field investigation and fluvial regime analysis,it is discovered that the local settlement of section S5＋000～S6＋700 of the southern training bank in the Yangtze Estuary was caused by the washing-away of the sand on the foundation bed through some joints between the bed protection mattresses where there was a lack of overlapping during the long-termaction of the driving currents along the bank formed by the blockage of current motion in Jiangya North Passage.Thus,the measure of enhancing the safety guarantee of the bed protection mattress structure was taken in the restoration design,through which a satisfactory effect was achieved.

关 键 词：长江口 导堤 沉降 沿堤流 软体排 

分 类 号：U617.9[交通运输工程—船舶及航道工程]