长江瑞昌段梁公堤段崩岸成因机制分析

Analysis on bank failure formation mechanism of Lianggongdi section at Ruichang section of Yangtze River

涉水多层地质结构岸坡在河流动力作用、水位升降等耦合作用下,坡体不同位置的岩土体受力不均,极易发生变形破坏,对岸坡工程安全运行及河道环境治理影响较大。以长江瑞昌段梁公堤段为研究对象,分析了黏土、砂性土、基岩组成的多层岸坡结构的崩岸机制,并利用河床演化分析和力学成因分析,提出多层地质结构崩岸的形成机制。结果表明,梁公堤在LG0+878~LG1+360段的内凹地段以条崩为主,LG1+360~LG2+118段和LG3+818~LG4+085段则表现为窝崩,LG2+118~LG2+818段以洗崩为主,而LG2+818~LG3+818段表现为滑崩,崩岸的成因跟水势、地势、地层结构密切相关。

Under the action of fluvial dynamics and water level variation and other coupling effect of the bank slope with multi-layer geological structure,owing to uneven stress of rock-soil body at different slope location,the slope body is easily damaged and deformed,which has great impact upon the safe operation of the bank slope engineering and river environment processing.Taking Lianggong embankment section at Ruichang section of the Yangtze River as the research target,the paper analyzes the bank failure mechanism of multi-layer bank slope structure composed with clay,sandy soil and pedestal rock,and puts forward multi-layer structure bank failure forming mechanism by applying the river bed evolution analysis and mechanical causes analysis.Results show that:the strip collapsing is dominated at the indented section at the section of Lianggongdi LGO+878~LG1+360,arc collapsing is dominated at the section of LG1+360~LG2+118 section and LG3+818,skyward collapsing is dominated at the section of LG2+118~LG2+818,and sliding collapsing is dominated at the section of LG2+818~LG3+818,and the bank failure is closely rated to water potential,terrain and stratum structure.