砂袋垫层的竖向承载力试验研究  

TEST FOR VERTICAL BEARING PERFORMANCE OF SANDBAG LAYER

作　　者：盛涛[1,2,3] 肖畅 李水明 金红亮 SHENG Tao;XIAO Chang;Li Shuiming;JIN Hongliang(Faculty of Architecture ＆ Civil Engineering ＆ Environment, Ningbo University, Ningbo 315211 , China;College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China;Ningbo Construction Engineering Group Co. Ltd, Ningbo 315040, China)

机构地区：[1]宁波大学建筑工程与环境学院,浙江宁波315211 [2]浙江大学建筑工程学院,杭州310058 [3]宁波建工工程集团有限公司,浙江宁波315040

出　　处：《工业建筑》2018年第6期96-100,184,共6页Industrial Construction

基　　金：国家自然科学基金项目(51408324);浙江省自然科学基金项目(LY18E080011,LY18E080013);浙江省151人才工程;博士后择优资助项目

摘　　要：结合足尺砂袋垫层开展竖向压缩试验,从叠放层数、砂袋尺寸、包装袋抗拉强度、含水率和颗粒级配五个角度,分析砂袋垫层的竖向承载力影响因素和机理。结果表明：1）在层数较少时,砂袋叠放层数对垫层的竖向承载力影响显著,承载力随层数的增大而快速降低,随着层数进一步增加,竖向承载力趋于稳定;2）减小砂袋尺寸可使包装袋表面的应力分布均匀化,有助于提高抗压承载力和压缩模量;3）包装袋抗拉强度直接影响砂袋垫层的抗压承载力和压缩模量,增加包装袋抗拉强度可大幅提升抗压承载力;4）含水率影响三相介质的组成比例,只对砂袋垫层的初始压缩模量有较大影响,对后期压缩模量和抗压承载力均无影响;5）颗粒级配只对砂袋垫层的压缩模量有一定影响,并且均匀级配砂袋垫层略小于单一级配,但对承载力无影响。砂袋垫层可满足一般多层建筑的竖向承载需求,但应注意可能对上部结构的不均匀沉降产生不利的影响。Vertical compression test was carried out with the full-size sandbag layers. The influence factors and mechanism on vertical bearing capacity of sandbag layers were analyzed from the five aspects： sandbag size,geotechnical sack tensile strength,moisture content and grain composition. The results showed： 1） When there were fewer layers,the layers impacted on the vertical bearing capacity significantly,and the bearing capacity reduced fastly with the layers increasing. As the layers further increasing,the vertical bearing capacity tended to be stable. 2） To reduce the size of the geotechnical sack could homogenize stress on the geotechnical sack＇s surface,help to increase the compressive bearing capacity and modulus of compressibility. 3） Tensile strength of the geotechnical sack directly affected the compressive bearing capacity and modulus of compressibility of the sandbag layer,and increasing the tensile strength of geotechnical sack could greatly enhance the compressive bearing capacity. 4） The moisture content influenced on the proportion of the three-phase medium also more significantly on the modulus of initial modulus of compressibility of the sandbag layer,but no effect on the latter modulus of compressibility and bearing capacity. 5） The grain composition only fewer influenced on the modulus of compressibility for the sandbag layer,and the impact of the uniform grain composition sandbag layer on modulus was slightly smaller than that of the single grain composition,but no effect on the bearing capacity. Although sandbag layer could satisfy bearing demands of multi-story buildings,the subsidence of upper structure should be paid more attention.

关 键 词：砂袋垫层 土工袋 抗压承载力 压缩模量 影响因素 试验 

分 类 号：TU470[建筑科学—结构工程]