不同地基处理条件下吹填土孔隙分布特征  

Pore distribution characteristics of dredger fill consolidated by different methods

作　　者：宋盛渊[1] 王清[1] 孙铁[2] 闫欢[1] 孙明乾[1] 苑晓青[1] 

机构地区：[1]吉林大学建设工程学院,吉林长春130026 [2]建设综合勘察研究设计院有限公司,北京100007

出　　处：《长安大学学报（自然科学版）》2015年第2期46-51,共6页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金国际合作项目(40911120044);国家自然科学基金项目(40372122;41172236);吉林大学基本科研业务费项目(450060491448)

摘　　要：为了评价和分析天津滨海新区中心渔港吹填土的固化效果和工后沉降,将经真空预压处理与未经真空预压处理的2组土样进行了室内物理化学试验分析。同时,还对不同处理条件下的2组土样进行了压汞试验,利用分形理论对吹填土中的孔隙直径进行了区间的划分,并对比了2组处理条件下孔隙率的变化特征。研究结果表明：与未经真空预压处理的土样相比,真空预压处理后的土样含水量减小、易溶盐含量减少,土体的物理化学性质得到改善;2组吹填土样孔隙直径分布区间大致相同,主要集中在0.4-3.5μm区间内,0.04-0.4μm和3.5-35μm区间有少量分布,小于0.04μm以及大于35μm区间的孔隙分布基本很少;在距地表0-8m和25-50m深度范围内,经真空预压处理土样中的孔隙率小,固化效果较好;在距地表8-25m深度范围内,经真空预压处理土体中的排水通道阻塞,导致土样的固结过程受到了影响,孔隙率较大,固化效果较差。In order to evaluate and analyze the consolidation effect and the post settlement of dredger fill in Tianjin Binhai New Area,two sets of soil samples handled with the vacuum preloading and without vacuum preloading were selected,and the physical and chemical tests on them were made in the laboratory.At the same time,two sets of soil samples were tested by mercury injection test,and the pore diameter range of dredger fill was divided by using fractal theory,and the characteristics of the porosity under 2conditions were compared.The test results show that compared with the one without vacuum preloading,water content and soluble salt content of the vacuum preloading one decreases,and the physical and chemical nature of dredger fill have been improved after the vacuum preloading.The pore diameter distributions of two sample sets are almost identical.The pore diameter is mainly distributed in 0.4-3.5μm,and the pores of 0.04-0.4μm and 3.5-35μm are less,and the pores of diameter less than 0.04μm and greater than 35μm are the least.In a burial depth of 0-8mand 25-50 m,porosity of soil becomessmaller and consolidation is better after the vacuum preloading,but in a burial depth of 8-25 m,porosity of soil is larger and consolidation is poor because the drainage channel of soil is blocked.

关 键 词：道路工程 吹填土 压汞试验 孔隙分布 分形 

分 类 号：U416.1[交通运输工程—道路与铁道工程] TU447[建筑科学—岩土工程]