水泥土小应变动参量的时间效应研究  

RESEARCH ON TIME EFFECT OF SMALL STRAIN DYNAMIC CHARACTERISTICS OF CEMENTED SOIL

作　　者：庄心善[1] 吕程伟 王军[2,3] 胡秀青[2,3] 

机构地区：[1]湖北工业大学,武汉430068 [2]温州大学建筑工程学院,浙江温州325035 [3]浙江省软弱土地基与海涂围垦工程技术重点实验室,浙江温州325035

出　　处：《工业建筑》2016年第2期72-77,共6页Industrial Construction

基　　金：国家自然科学基金项目(51478364)

摘　　要：通过GDS共振柱试验,研究不同水泥掺量、养护龄期和围压对水泥土小应变动参量的时间效应。试验结果表明:水泥掺量越大,养护龄期越长,水泥土小应变动剪切模量越高。相同围压下,水泥土小应变动剪切模量越小,水泥土主固结时间越长,固结后小应变归一化剪切模量增长率越大。围压越大,水泥土时间效应越明显,高围压下水泥土小应变动剪切模量显著增大。水泥土在时间效应阶段,其小应变动剪切模量随时间呈近乎线性增长,对于短期内水泥土小应变动剪切模量可以在室内利用共振柱试验测得水泥土归一化剪切模量增长率后进行修正。The influence of different cement mixing ratio, curing age and confining pressure on the time effect of small strain dynamic characterics of cemented soil was studied through GDS resonance column. The research showed that the more cement mixed and the longer curing age was, the higher the small strain dynamic shear modulus of cemented soil was. Under the same confining pressure, the smaller the small strain dynamic shear modulus of the cemented soil was, and the longer the time of the primary consolidatison of the cemented soil was, the larger the increase rato of the small strain normalization shear modulus was after consolidation. The larger the confining pressure was, the more obvious the time effect of the cemented soil was, under high eomfining pressure, the small-strain dynamic shear modulus of the cemented soil was increased significantly. During the secondary consolidation, the small strain dynamic shear modulus was linear growth, in the short term, the small strain dynamic shear modulus could be modifized after getting the growth rate of normalization dynamic shear modulus by using resonance column test.

关 键 词：水泥土 小应变 动剪切模量 时间效应 

分 类 号：TU43[建筑科学—岩土工程]