夯扩桩加固湿陷性黄土地基机理研究  

Study of improvement mechanism of compaction-widening piles by tamping in collapsible loess foundation

作　　者：聂庆科[1,2] 梁金国[1] 韩立君[1] 李华伟[1,2] 

机构地区：[1]河北建设勘察研究院有限公司,石家庄050031 [2]河北省岩土工程技术研究中心,石家庄050031

出　　处：《岩土力学》2011年第6期1819-1823,共5页Rock and Soil Mechanics

摘　　要：通过现场试验对夯扩挤密桩加固湿陷性黄土地基的机理进行研究。利用现场取得的加固前的原状土样和加固后的土样进行室内对比试验,测定加固前、后桩间土的物理力学性质指标(如孔隙比、湿陷系数和密实系数等)的变化。根据这些结果,分析了夯扩挤密桩加固湿陷性黄土地基的效果和夯扩挤密桩在水平方向和深度方向的挤密程度和影响范围。最后讨论了工程实践中夯扩挤密桩设计应采取的合理的桩间距。According to a practical case of composite foundation in collapsible loess foundation,the squeezing effects on compaction pile by tamping are studied.In field test,the undisturbed samples before treatment and the samples after treatment are first obtained;and then the physical parameters（e.g.void ratio,coefficient of collapsibility,coefficient of compactness,etc） are studied.Using the test results,the squeezing effects of the soil between piles with loading variation are discussed.Besides,the affecting scopes in horizontal and vertical directions are also analyzed.Finally,the reasonable spacing between piles which should be used in practical applications is discussed.

关 键 词：夯扩挤密桩 湿陷性黄土 加固机理 湿陷系数 桩间距 

分 类 号：TU473[建筑科学—结构工程]