九圩港闸站枢纽工程场地粉砂土静、动力特性试验研究  

Experimental study on static and dynamic characteristics of silty soil in the site of Jiuwei Port Sluice Station Hub Project

作　　者：沈春林 王伟 钟建 吴建伟 SHEN Chunin;WANG Wei;ZHONG Jian;WU Jianwei(Nantong Jiuwei Port Water Conservancy Engineering Management Office,Nantong 226003,China;Nantong-Lvsi Canal Water Conservancy Engineering Management Office,Nantong 226000,China)

机构地区：[1]南通市九圩港水利工程管理所,江苏南通226003 [2]南通市通吕运河水利工程管理所,江苏南通226000

出　　处：《江苏水利》2024年第7期47-52,共6页Jiangsu Water Resources

摘　　要：为研究九圩港闸站枢纽工程场地含化学污染物Cu^(2+)的粉砂土承载能力,设计开展了三轴静力测试与循环动荷载加卸试验。试验数据分析表明:围压对粉砂土试样应变特征影响高于化学污染物Cu^(2+)含量,而化学污染物会削弱试样承载能力,且削弱效应逐步增强;在动荷载循环加卸过程,不同强度的围压作用,试样内部孔隙结构演化路径各有区别;当化学污染物Cu^(2+)含量增大,则孔压分布愈低,而随着循环振次进程加快,则各Cu^(2+)含量试样之间的孔压差幅更大;在各围压作用下,动弹性模量随应变均为“递减-稳定”变化特征,围压作用还会影响化学污染物含量对动弹性模量参数影响效应。To study the bearing capacity of silty soil containing chemical pollutant Cu2+in the Jiuwei Port Sluice Station Hub Project site,triaxial static tests and cyclic dynamic load loading and unloading tests were designed and carried out.Based on experimental data analysis,it is shown that the influence of confining pressure on the strain characteristics of silty soil samples is higher than that of chemical pollutant Cu^(2+)content,and chemical pollutants weaken the bearing capacity of the samples,and the weakening effect gradually strengthens.During the process of cyclic loading and unloading under dynamic loads,the evolution paths of the internal pore structure of the specimen vary with different intensities of confining pressure.When the content of chemical pollutant Cu^(2+)increases,the pore pressure distribution becomes lower,and as the cyclic vibration process accelerates,the pore pressure difference between samples with different Cu^(2+)contents become larger.Under various confining pressures,the dynamic elastic modulus exhibits a“decreasing stable”variation characteristic with strain,and the confining pressure also affects the effect of chemical pollutant content on the dynamic elastic modulus parameters.

关 键 词：九圩港闸站枢纽工程 粉砂土 三轴剪切 动力特性 

分 类 号：TU521[建筑科学—建筑技术科学]