Q_(3)黄土结构密实度对土水特征曲线的影响分析  

The Effect of Degree of Density on the Soil Water Characteristic Curve of Q_(3) Loess

作　　者：纪翔鹏 侯晓坤[2] Ji Xiangpeng;Hou Xiaokun(No.1 Geological and Mineral Resources Institute of Shandong,Ji'nan 250014,China;School of Geological Engineering and Surveying,Chang'an University,Xi'an 710054,China)

机构地区：[1]山东省第一地质矿产勘查院,山东济南250014 [2]长安大学地质工程与测绘学院,陕西西安710054

出　　处：《甘肃科学学报》2021年第3期136-141,共6页Journal of Gansu Sciences

摘　　要：为了研究不同干密度原状黄土样土水特征曲线之间的差异,在甘肃黑方台开挖探井取不同埋深的Q3原状黄土样,进行基本物理力学性质和土水特征曲线的测试,并用Gardner模型、Van Genuchten模型、Fredlund&Xing模型对所测土水特征曲线进行拟合。基于此提出了考虑土体干密度的土水特征曲线模型,并利用此模型预测另一干密度Q_(3)黄土样的土水特征曲线,且同实测值进行了比较。结果表明干密度对土水特征曲线有一定影响。接近饱和区,相同基质吸力下,干密度越大的土样体积含水率越小;在过渡区,相同基质吸力下,干密度越大的土样体积含水率越大;在残余区,不同干密度土样的土水特征曲线近似重合。各模型的拟合参数也随干密度的变化呈现规律性变化,提出的考虑干密度的土水特征曲线模型预测曲线同实测值基本接近。In order to explore the effect of dry density on the Soil Water Characteristic Curve(SWCC)of Q_(3) intact loess,basic physical parameters of undisturbed Q_(3) loess at the same location but different buried depth in Heifangtai,Gansu province were measured firstly and then the corresponding SWCCs.Then The measured SWCC was modeled by the Van Genuchten model,Gardner model and the Fredlund&Xing model,based on which new model considering the dry density was put forward.This new model was used to predict the SWCC of the Q_(3) loess with another dry density.Results show that dry density has a significant influence on the SWCC.In the saturated zone of SWCC,the bigger the dry density is,the lower the volumetric water content is at the same suction value,while the relationship is contrary in the transitional zone and at the residual zone,the SWCCs of intact Q_(3) loess converge together.The fitting parameters in the three models above also change regularly with the dry density.The predicting SWCC by the model considering the dry density is similar to the actual value.

关 键 词：Q_(3)黄土 土水特征曲线 干密度 土水特征曲线模型 

分 类 号：TH312[机械工程—机械制造及自动化]