长江口海域软黏土一维固结特性试验研究  

Experiments on One-dimensional Consolidation Characteristics of Marine Soft Clay in Yangtze Estuary

作　　者：马锐 吴宪勇 赵丁凤 Ma Rui;Wu Xianyong;Zhao Dingfeng(CSSC Institute of the Engineering Investigation&Design Co.,Ltd.,Shanghai 200063,China;Shanghai Waterway Engineering Design and Consulting Co.,Ltd.,Shanghai 200120,China)

机构地区：[1]中船勘察设计研究院有限公司,上海200063 [2]中交上海航道勘察设计研究院有限公司,上海200120

出　　处：《岩土工程技术》2024年第2期211-215,共5页Geotechnical Engineering Technique

摘　　要：特殊的沉积条件使长江口海域软黏土的力学特性具有明显的地域性。为研究长江口海域饱和软黏土的固结特性及其参数(固结系数C_(v)、压缩系数a_(v)和渗透系数k)的变化规律,对启东长江口某海上风电项目场地软黏土开展了一系列逐级加载的一维固结试验。结果表明:在自然沉积过程中,长江口海域软黏土因受长江水流及黄海和东海潮波的共同作用而具有较弱的结构性;固结过程中,海域软黏土固结变形的发展可分为线性发展阶段、快速变形阶段、稳定阶段,固结变形增量ΔSti随固结应力的增大呈现先减小后增大的变化;固结过程中,长江口海域黏土和粉质黏土的C_(v)先减小后增大并趋于稳定,av和k逐渐减小并趋于稳定,相较黏土,粉质黏土具有较大的C_(v)和k,较小的a_(v)。研究可为该区域海洋工程的基础设计提供参考。To investigate the consolidation characteristics and the variation of consolidation parameters(consolidation coefficient Cv,compression coefficient av and permeability coefficient k)of saturated marine soft clay in the Yangtze estuary,a series of multistage one-dimensional consolidation tests were conducted on the marine soft clay of an offshore wind platform project in the Yangtze estuary of Qidong city.The results show that during the natural deposition process,the marine soft clay in the Yangtze estuary has a weak structure due to the co-action of the Yangtze River current and the tidal waves of the Yellow Sea and the East China Sea.Furthermore,during the consolidation process,the development of consolidation deformation of the marine soft clay can be divided into three stages:linear development stage,rapid deformation stage,and stabilization stage,and the increment of consolidation deformationΔSti decreases first and then increases with the increase of consolidation stress.Moreover,during the consolidation process,the C_(v) of marine clay and marine silty clay first decreases and then increases,and the av and k gradually decrease.The C_(v) and k of marine silty clay were larger,and the av was smaller than those of marine clay.This study can provide basic parameters for the foundation design of marine engineering in this region.

关 键 词：海域软黏土 固结特性 固结系数 压缩系数 渗透系数 

分 类 号：TU447[建筑科学—岩土工程]