吹填土无砂真空预压工艺及加固效果分析  

Vacuum Preloading without Sand Blanket Construction Technique and It Results

作　　者：缪冬 盛东升[2,3] 张红 张金良 吴月龙[2,3] 

机构地区：[1]中交第三航务工程局有限公司宁波分公司,浙江宁波315200 [2]南京水利科学研究院,南京210029 [3]南京瑞迪建设科技有限公司,南京210029

出　　处：《土工基础》2015年第3期38-43,共6页Soil Engineering and Foundation

摘　　要：某工程采用无砂垫层真空预压法,抽真空90d后,加固效果良好,软基中土体物理力学指标均有大幅改善,土体的强度也有所增长,静荷载试验和十字板剪切强度检测结果表明：加固效果明显,达到工程设计要求的表层承载力标准值（50kPa）。结合不同行业规范地基承载力的多种评价依据,归纳总结出适合吹填土的根据含水率判定地基承载力大小的判定标准,即：对吹填土表层0-1.5m,按含水率57.8%对应地基承载力特征值fak≥50kPa进行判定;对0-原滩面按含水率62.5%对应地基承载力特征值fak≥40kPa进行判定。This paper presents a successful vacuum preloading on dredged soils without sand blanket project.After 90 days of vacuum preloading,both physical and mechanical properties of the soft soils demonstrated improvements.The soil strength also increased,as examined by both the static plate loading tests as well as the vane shear tests.The bearing resistance of the surface soil reached the design required value of 50 kPa.The bearing resistance determination combined different industrial standards and summarized the design criteria for the bearing resistance for dredged soils.For surface soil within 1.5meters below the ground,the 50 kPa requirement can be estimated with moisture content of the soil.If the moisture content of the soil is smaller than 57.8%,the bearing resistance of the ground is greater than 50 kPa,whereas,the bearing resistance of the soil is greater than 40 kPa if the moisture content of the soil is less than 62.5%.

关 键 词：吹填土 真空预压 检测 加固效果 地基承载力 

分 类 号：TU472[建筑科学—结构工程]