疏浚泥浆沉淤过程的阶段性分析试验研究  

Experimental study on the settling process of dredged material in the seawater sedimentary environment

作　　者：陈雷[1,2] 李治朋 安彦勇[1,2] 王春亮 陈宇 刘峥嵘[3,4] CHEN Lei;LI Zhi-peng;AN Yan-yong;WANG Chun-liang;CHEN Yu;LIU Zheng-rong(Tianjin Research Institute for Water Transport Engineering,M.O.T.,Tianjin 300456,China;Tianjin Survey and Design Institute for Water Transport Engineering Co.Ltd.,Tianjin 300456,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210024,China;Research Institute of Geotechnical Engineering,Hohai University,Nanjing 210024,China)

机构地区：[1]交通运输部天津水运工程科学研究所,天津300456 [2]天津水运工程勘察设计院有限公司,天津300456 [3]河海大学岩土力学与堤坝工程教育部重点实验室,南京210024 [4]河海大学岩土工程科学研究所,南京210024

出　　处：《水道港口》2022年第5期645-651,共7页Journal of Waterway and Harbor

基　　金：国家自然科学基金项目(51778211)。

摘　　要：根据室内沉降柱试验结果将泥浆的沉淤过程分为区域沉降阶段、压缩沉降阶段和固结沉降阶段,通过对不同浓度泥浆的沉淤过程进行阶段性分析,研究疏浚泥浆在静海水环境下沉积规律。试验结果表明:在静海水环境下,泥浆悬液很快形成泥浆浊液面,开始发生区域沉降,在此阶段泥浆浊液面保持恒速整体下沉,泥浆的初始浓度越大,沉降速率越小;将泥浆浊液面历时曲线的拐点作为压缩沉降阶段的起始点,此阶段泥浆沉降缓慢,沉降速率基本相当,与初始泥浆浓度影响不大;在固结沉降期,泥浆趋于沉降稳定,随着孔隙水压力的消散,有效应力逐渐增长,土体发生固结变形以及次固结变形。研究揭示在静海水环境下,疏浚泥浆沉淤过程中沉降阶段划分方法和状态转变的规律,为淤泥淤积量预测、纳泥区库容评估和吹填淤泥的疏浚施工提供参考。According to the results of settling column test,the sedimentation process of mud was divided into zone settling stage,compression settling stage and consolidation settling stage to study the settling rule of dredged material in the seawater sedimentary environment.The results showed that in the seawater environment,interface would formed in the first few minutes,the mud may exhibit zone settling.At this stage,the interface kept sinking at a uniform speed;the break point of the depth to interface versus time curve was taken as the starting point of the compression settling stage.In this stage,the mud of each concentration settled slowly,and the sedimentation rate was basically the same,which had little effect on the initial mud concentration;in the consolidation settling period,the mud tended to settle stably.With the dissipation of pore water pressure,the effective stress gradually increased,and the consolidation deformation and secondary-consolidation deformation of the soil occurred.This study reveals the division of settlement stages and state transformation of dredged mud in the process of sedimentation in seawater environment,which provides a reference for the prediction of sludge deposition,the evaluation of reservoir capacity in disposal area and the dredging construction of Hydraulic Reclamation sludge.

关 键 词：疏浚泥浆 区域沉降 压缩沉降 固结沉降 

分 类 号：U656[交通运输工程—港口、海岸及近海工程]