EPS颗粒混合轻质土与砂土的动力变形特性对比试验研究  

Comparative experimental research on dynamic deformation behaviors of lightweight sand-EPS beads soil with sands

作　　者：高玉峰[1,2] 童瑞铭[3] 黎冰[1,2] 王庶懋[1,2] 丰土根[1,2] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [2]河海大学岩土工程科学研究所,南京210098 [3]国网北京电力建设研究院,北京100055

出　　处：《岩土力学》2008年第12期3271-3276,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.50479020);教育部留学回国人员基金项目(2005);江苏省青蓝工程资助项目(2006)

摘　　要：在以干密度控制配比的原则下,对砂土与EPS颗粒混合轻质土(LSES)和其原料土砂土进行了动力变形特性对比试验研究。试验表明,LSES与纯砂的动弹性模量具有同样的随应变的增大而减小的性质,不同EPS颗粒体积含量和水泥掺入比的LSES动弹性模量普遍高于纯砂的动弹性模量。LSES与纯砂均显示出动弹性模量随围压的增大而增大的特性,围压对LSES的动弹性模量影响与纯砂相比相对较大。LSES与纯砂的等效阻尼比在整体上具有同样的随应变的增大而增大的性质。水泥掺入比较小时,LSES的等效阻尼比与纯砂相近;在高水泥掺入比下,不同EPS颗粒体积含量的LSES等效阻尼比均低于纯砂的等效阻尼比。LSES与纯砂均显示出等效阻尼比随围压的增大而减小的特性。围压对纯砂与LSES等效阻尼比的影响程度相近。Comparative experiment research on dynamic deformation behaviors of lightweight sand-EPS beads soil （LSES） with sand is taken with mixing proportions determined by dry density. Test results indicate that Ed （dynamic elastic modulus） of LSES and sands both decrease with the increase of strain; and Ed of LSES with different contents of cement and EPS beads are all larger than that of sands. Ed of LSES and sands both increase with the increase of σc （confining pressure）, but the influence of σc on LSES is more notable. D （equivalent damping ratio） of LSES and sands both increase with the increase of strain. D of LSES approximates to that of sands when content of cement is low, and D of LSES is smaller with higher content of cement. D of LSES and sands both decrease with the increase of σc, and the influence of σc on D is similar.

关 键 词：砂土与EPS颗粒混合轻质土 动弹性模量 等效阻尼比 

分 类 号：TU411[建筑科学—岩土工程]