干湿循环下稻草秸秆-聚乙烯醇增强粉质黏土强度特性与微观机理  

Strength Characteristics and Micro Mechanism of Straw-Polyvinyl Alcohol Reinforced Silty Clay under Dry-Wet Cycle

作　　者：汪锦东 罗梦婷 鹿庆蕊[1] 王秋哲 李栋伟 WANG Jindong;LUO Mengting;LU Qingrui;WANG Qiuzhe;LI Dongwei(School of Architectural Engineering,East China University of Technology,Nanchang 330013,China;School of Construction Engineering and Management,Jiangsu Vocational College of Business,Nantong 226000,China;College of Civil Engineering and Architecture,Dalian University,Dalian 116622,China)

机构地区：[1]东华理工大学土木与建筑工程学院,南昌330013 [2]江苏商贸职业学院建筑工程与管理学院,南通226000 [3]大连大学建筑工程学院,大连116622

出　　处：《硅酸盐通报》2024年第7期2630-2639,共10页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(42061011,41977236,52168044);江西省重点研发项目(20232BBE50025,20223BBG71W01);江西省核资源与环境国家重点实验室开放基金项目(NR1930);江西省教育厅科技项目(GJJ2200702);南通市自然科学基金青年基金项目(JC2023026)。

摘　　要：工程建设中遇到黏土场地时往往需要用固化剂增强土体的力学性能,本文研究了干湿循环下稻草秸秆-聚乙烯醇(浓度分别为0%、0.5%、2.0%、3.0%、4.5%,质量分数)增强粉质黏土的力学特性,借助扫描电子显微镜试验和IPP软件进行了微观分析。结果表明,在不同干湿循环次数下,当聚乙烯醇浓度为2%时,聚乙烯醇(PVA)溶液填充孔隙,包裹土颗粒,土体力学性能最佳。Curing agent is often used to enhance the mechanical properties of soil when clay sites are encountered in engineering construction.In this paper,the mechanical properties of silty clay reinforced by straw-polyvinyl alcohol(0%,0.5%,2.0%,3.0%,4.5%,mass fraction)under dry-wet cycle were studied.The microscopic analysis was carried out by means of electron microscope scanning test and IPP software.The results show that when the concentration of polyvinyl alcohol is 2%,the polyvinyl alcohol(PVA)solution fills the pores,wraps the soil particles,and the mechanical properties of soil are the best under different dry-wet cycles.

关 键 词：聚乙烯醇 稻草秸秆 粉质黏土 干湿循环 微观结构 力学性能 

分 类 号：TU43[建筑科学—岩土工程]