荆江航道整治工程存在的地质问题及处理措施

The Engineering Geological Problems and Treatment Measures of Jingjiang Waterway's Regulation Project

长江中游荆江河段位于江汉平原与洞庭湖平原之间,河道多弯汊,航道极不稳定,碍航情况频发。整治工程主要采取高滩守护、护滩(底)、坝体、护岸加固、填槽和水下整平等措施。工程区河床主要为粉细砂,岸坡由粘性土和砂性土组成,存在高滩(岸坡)守护段岸坡稳定、护岸工程施工过程中的流砂问题、岸坡淤泥质土的流变(触变)和护滩(底)及坝体地基冲刷等工程地质问题,针对不同的地质问题采取了相应的工程处理措施。

Jingjiang River in the middle reach of Yangtze river is between of Jianghan Plain and Dongting Lake Plain,there are many bends and branches in it ,the shipping lane is unstable ,the situation of hinder often happens .The regulation mainly adopts the measures which include the safeguard of the high beach ,the protection of the beach （ bot-tom） and dam,the reinforcement of the retaining wall ,the slot-filling and underwater flattening methods .The main In-gredient of the riverbed in the engineering sites is fine sand ,the bank slope is made up of cohesive soil and sandy soil . The problems include the instability of the guardian period of bank slope、the sand flow problem in the construction process of the bank-protection work、the flowing deformation of the bank slope＇s mucky soil ,and the engineering geolog-ical problems of the scouring in the beach protection and dam foundation .According to the different geological problems , we need to adopt the corresponding engineering treatment measures .