制样含水率对压实黄土持水及变形特性影响试验研究  

Experimental Study on Effects of Sample Moisture Content on Water Retention and Deformation Characteristics of Compacted Loess

作　　者：李晓敏 穆青翼 丁心安 朱文秀[1] 王艳娥 LI Xiaomin;MU Qingyi;DING Xin’an;ZHU Wenxiu;WANG Yan’e(Xi’an Siyuan University,Xi’an,Shaanxi 710038,China;Department of Civil Engineering,Xi’an Jiaotong University,Xi’an,Shaanxi 710049,China)

机构地区：[1]西安思源学院,陕西西安710038 [2]西安交通大学,陕西西安710049

出　　处：《水利与建筑工程学报》2022年第5期123-130,共8页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金青年基金项目(51909205);中国博士后科学基金面上项目(2018M631166);中国博士后科学基金特别资助项目(2019T120914)。

摘　　要：通过研究不同制样含水率(击实曲线干侧、最优含水率下和湿侧)且同一干密度的压实黄土,分析由制样含水率所引起结构性差异对压实黄土持水和变形特性的影响。结果显示,制样含水率不同引起的黄土结构性差异影响压实黄土的进气值、脱湿速率和残余含水率,进气值关系为:最优含水率<击实曲线干侧<击实曲线湿侧,脱湿速率关系为:击实曲线湿侧<最优含水率<击实曲线干侧,残余含水率关系为:击实曲线干侧<最优含水率<击实曲线湿侧。另一方面,干密度和试验含水率一定时,在最优含水率下制备的试样湿陷变形最大,在击实曲线干侧击实比在湿侧击实更能减小压实黄土的增湿变形。The compacted loess with different compaction water content(dry side,optimum and wet side of compaction curve)and same dry density are tested to investigate the structural effects on collapsibility behaviors and the water retention characteristics.It is found that the structural differences induced by different compaction water contents affect not only the air entry value but also the desorption rate and residual water content.The relationship of air entry value from low to high is optimum,dry side,and wet side.The relationship of desorption rate from low to high is wet side,optimum,dry side while the relationship of residual water content from low to high is dry side,optimum,wet side.On the other hand,at same dry density and tested water content,the collapsible deformation is relatively the greatest for loess compacted at the optimum water content while the collapsible deformation is smaller for loess compacted in the dry side of compaction curve than in the wet side.

关 键 词：压实黄土 制样含水率 干密度 持水特征 增湿变形 

分 类 号：TU443[建筑科学—岩土工程]