PVA纤维水泥土的动力特性试验研究  

Experimental study on dynamic characteristics of PVA fiber reinforced cement soil

作　　者：孙磊 王依凡 吴瑕 SUN Lei;WANG Yifan;WU Xia(School of Resources and Civil Engineering,Suzhou University,Suzhou 234000,China)

机构地区：[1]宿州学院资源与土木工程学院,安徽宿州234000

出　　处：《河南工程学院学报（自然科学版）》2023年第4期16-21,共6页Journal of Henan University of Engineering：Natural Science Edition

基　　金：安徽省教育厅高校优秀青年人才支持项目(gxyq2022106);安徽省自然科学基金项目(1908085QE215);安徽省大学生创新创业项目(S202110379189);宿州学院大学生创新创业训练计划项目(ZCXM22-311);宿州学院大学生创新创业训练计划项目(KYLXYBXM22-073)。

摘　　要：为探究聚乙烯醇(PVA)纤维水泥土在循环荷载作用下的动力特性,利用DSZ-2型电磁振动三轴试验系统对人工制备纤维水泥土开展了一系列不排水三轴循环剪切试验,在统一水泥和纤维掺量的条件下,考虑了围压和纤维长度对水泥土动剪切模量(G_(d))和阻尼比(λ_(d))的影响。试验结果表明,伴随剪应变(γ_(d))的增大,λ_(d)逐渐增大,而G_(d)逐渐变小且与γ_(d)成双曲线函数关系。此外,围压和纤维长度均对水泥土的G_(d)和λ_(d)有显著影响,且影响程度随着γ_(d)的增大逐渐增强。当其他试验条件相同时,随着围压的增大或纤维长度的增加,G_(d)逐渐增大,而λ_(d)则呈现出与之完全相反的演化规律。A series of undrained cyclic triaxial tests using DSZ-2 dynamic triaxial apparatus were carried out to investigate the dynamic characteristics of PVA fiber reinforced cement soil due to cyclic loading.Under identical cement and fiber content,the confining pressure and PVA fiber length were considered in the test process.The test results show that,the damping ratio(λ_(d))increases with the increase of shear strain(γ_(d)),while the dynamic shear modulus(G_(d))decreases approximately as a hyperbolic function with the increase of shear strain.In addition,both the G_(d)andλ_(d)was significantly influenced by the confining pressure and PVA fiber length,and the influence increases gradually with the increase ofγ_(d).Under otherwise identical condition,the dynamic shear modulus gradually increases with the increase of confining pressure or PVA fiber length,while the damping ratio exhibit opposite evolution rules.

关 键 词：PVA纤维 水泥土 循环三轴试验 动剪切模量 阻尼比 

分 类 号：TU443[建筑科学—岩土工程]