南夹江裁湾工程地质问题分析

Analysis on Engineering Geological Problems of Cut-off in Nanjiajiang

南夹江为长江铜陵河段的一条汊河,现河道为一"几"字形河道,阻水严重,岸坡多处发生崩塌。裁湾工程拟将原来的"几"字形河道裁湾取直,使河道顺直,减轻防洪压力。工程区分布有厚覆盖层,厚度60 m左右,岩性主要为粉质粘土、粉质壤土、砂壤土、细砂和砾石等,存在拦河坝端头抗冲刷、渗漏与渗透破坏、饱和砂土震动液化和地基沉降变形等工程地质问题。

Nanjiajiang as a distributary of Tongling-Yangtze River,is a ＂几＂ shape and with the problems of resisting water seriously,breaking avalanche disaster arround the bank.The cut-off project will modify the ＂几＂ shape river to make water move smoothly and relieve the pressure of preventing flood.This place distributes a 60 m thick cover layer.The lithology mainly contains silty clay,silty loam soil,sandy loam soil,fine sand,gravel and etc..Therefore,some geological problems,such as erosion,leakage and seepage destroy,liquefaction by shaking and foundation deformation exist in the project.