秸秆排水体联合间歇抽真空处理疏浚泥试验研究  

Experimental study on the dredged slurry treated by intermittent vacuum preloading combined with straw drainage body

作　　者：姚达 周志彦 徐桂中[2] 张丹[2] 郭植恒 YAO Da;ZHOU Zhiyan;XU Guizhong;ZHANG Dan;GUO Zhiheng(Jiangsu Hongji Water Source Technology Co.Ltd.,Yangzhou 225002,China;School of Civil Engineering,Yancheng Institute of Technology,Yancheng 221051,China;School of Civil and Architectural Engineering,East China University of Technology,Nanchang 330013,China)

机构地区：[1]江苏鸿基水源科技股份有限公司,扬州225002 [2]盐城工学院土木工程学院,盐城221051 [3]东华理工大学土木与建筑工程学院,南昌330013

出　　处：《水道港口》2024年第1期123-130,共8页Journal of Waterway and Harbor

基　　金：国家自然科学基金项目(52078449);江苏南水北调科技项目(JSNSBD201910)。

摘　　要：为明确秸秆排水体联合间歇式真空处理高含水率疏浚泥的加固效果,对不同真空间歇时长下的疏浚泥展开室内模型试验,研究了不同真空间歇时长下疏浚泥的处理效果。研究结果表明:和恒定真空加载方式相比,采用间歇式真空可降低排水体滤布的淤堵,提高真空在土中的传递效率,从而改善真空预压处理后疏浚泥的加固效果。通过综合对比分析,对文章所使用的秸秆排水体和疏浚泥来说,采用中间间歇12 h再施加真空荷载的模式处理疏浚泥效果更佳。相对传统恒定真空加载模式,疏浚泥的累积出水量提升15%,十字板剪切强度提高32.7%,土体含水率降低19.3%。除此之外,秸秆的降解会影响排水体的真空传递效果;随着秸秆的持续降解,10 d左右后,秸秆排水体内部的真空度开始呈现明显下降的趋势。In order to clarify the reinforcement effectof dredged slurry treated by intermittent vacuum preloading combined with straw drainage body,indoor model tests were carried out on dredging slurry with different intermittent vacuum.The treatment effect of dredged slurry under different intermittent vacuum was studied.The results show that compared with the constant vacuum loading,the intermittent vacuum preloading can reduce the silting of the filter cloth of the drainage body,improve the vacuum transfer efficiency in the soil,and thus improve the reinforcement effect of dredged slurry after vacuum preloading treatment.Through comprehensive comparative analysis,for the straw drainage boday and dredged slurry used in this paper,the mode of vacuum load with intervals of 12 hours is more effective.Compared with the traditional constant vacuum loading,the accumulated water yield of dredged slurry is increased by 15%,the shear strength of cross plate is increased by 32.7%,and the water content of soil is decreased by 19.3%.In addition,the degradation of straw affects the vacuum transfer effect of the drainage body.With the continuous degradation of straw,the vacuum inside the straw drainage body starts to show an obvious decreasing trend after about 10 d.

关 键 词：秸秆排水体 间歇式真空预压 疏浚淤泥 模型试验 真空度 

分 类 号：U65[交通运输工程—港口、海岸及近海工程] TV11[交通运输工程—船舶与海洋工程]