长江中游某崩岸段崩塌变形特征离心模型试验研究  

Centrifugal model tests on deformation characteristics of a bank collapse section in middle reaches of Yangtze River

作　　者：陈航 程永辉[1] 胡胜刚[1] 李波[1] CHEN Hang;CHENG Yonghui;HU Shenggang;LI Bo(Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China)

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010

出　　处：《岩土工程学报》2024年第S01期127-131,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家重点研发计划项目(2023YFC3209004)。

摘　　要：在汛期和退水期,长江中下游河道崩岸频发,对沿岸堤防、水运交通航道、跨江大桥等建筑物具有非常大的影响。但是由于崩岸是一个动态突发的过程,影响因素较多,作用机制较为复杂,目前崩岸的机理和变形特征尚未完全揭示。以长江中游南五洲长江村崩岸段作为代表,通过现场勘察获取地层特征,采用室内物理力学试验分析土体物理力学特性,并基于崩岸段断面实测地形采用简化岸坡模型开展离心模型试验研究,同时与DDA数值分析结果对比分析,揭示了岸坡坡脚淘刷导致岸坡崩塌的过程,其中岸坡土体崩塌表现为“错动+转动”的突然崩落特征。During the flood season and the recession period,the bank collapses in the middle and lower reaches of the Yangtze River occur frequently.They have a great impact on the coastal embankments,water transport channels,river-crossing bridges and other buildings.However,due to the fact that the bank collapse is a dynamic and sudden process with many influencing factors and complicated mechanism,and the mechanism and deformation characteristics of the bank collapse have not been fully revealed at present.Based on the bank collapse section of Nanwuzhou Changjiang Village in the middle reaches of the Yangtze River as a representative,the stratum characteristics are obtained through field prospecting.The physical and mechanical characteristics of soil mass are analyzed through the indoor physical and mechanical tests.The centrifugal model tests are carried out to reveal the process of bank slope collapse caused by the scouring of the non-cohesive soil layer at the foot of the slope.While the section shape is simplified based on the measured topography of the bank collapse section.Meanwhile,the DDA numerical analysis results are used to compared with the test ones,which shows that the bank slope soil collapse exhibits a sudden collapse characteristics with‘dislocation+rotation’deformation.

关 键 词：崩岸 土体特性 离心模型试验 变形特征 

分 类 号：TU411[建筑科学—岩土工程]