干湿循环下重塑粉质黏土湿陷变形及其影响因素研究  

Study on the Collapse Deformation of Remolded Silty Clay under Dry-Wet Cycles and Its Influencing Factors

作　　者：吴向峰 张卫兵[1,2] 蒋佳莉 马桂平 管小龙 WU Xiangfeng;ZHANG Weibing;JIANG Jiali;MA Guiping;GUAN Xiaolong(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Engineering Research Center Funded by Ministry of Education for Effective Utilization of Water Resources in Modern Agriculture in Arid Areas,Yinchuan 750021,China)

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021 [2]宁夏旱区现代农业水资源高效利用教育部工程研究中心,宁夏银川750021

出　　处：《宁夏工程技术》2024年第1期42-47,共6页Ningxia Engineering Technology

基　　金：宁夏回族自治区重点研发计划项目(2018BEE03005);宁夏高等学校一流学科建设(国内一流建设学科)项目(NXYLXK2017A03);宁夏大学研究生创新项目(GIP2021051)。

摘　　要：为研究粉质黏土在干湿循环作用下的湿陷变形规律,以银川粉质黏土为研究对象,制备不同饱和度和压实度的试样,进行干湿循环作用下的湿陷变形试验。结合多因素交互作用的显著性分析法,对不同影响因素下湿陷变形率进行分析。结果表明:压实度及饱和度对湿陷变形率产生了不同程度的影响;对于中低饱和、高饱和土体,在干湿循环作用下,压实度对减缓湿陷变形作用显著性不同,且减缓效果与干湿循环过程相关。干湿循环次数、压实度、饱和度的三因素显著性分析结果表明,三因素显著性均为强,交互作用对湿陷变形率显著性程度不同。为减小压实度和饱和度对地基变形的影响,建议初始压实度不低于95%,且不宜超过最优含水率所对应的饱和度。To investigate the wetting collapse deformation pattern of silty clay under dry-wet cycles,typical silty clay in Yinchuan was selected as the research subject to prepare samples with different degrees of saturation and compaction and to carry out the collapsibility test.The significance analysis method of multi-factor interaction was combined to analyze the collapse deformation rate under different influencing factors.It is shown that compaction and saturation degrees had different effects on the wetting collapse deformation rate.For medium-low saturation and high saturation soils,the effect of compaction on mitigating wetting collapse deformation was significantly different under dry-wet cycles,and the mitigation effect was related to the dry-wet cycle process.The significance analysis results of the three factors,namely the number of dry-wet cycles,compaction degree,and saturation,showed that all three factors had a strong significance,and their interactive effects had different degrees of significance on the wetting collapse deformation rate.To minimize the effects of compaction and saturation on the foundation deformation,it is suggested that the initial compaction degree should not be less than 95%,and the degree of saturation should not exceed that corresponding to the optimum moisture content.

关 键 词：干湿循环 湿陷变形 交互作用 

分 类 号：TU411[建筑科学—岩土工程]