摘要
以黑方台地区原状黄土为对象,开展不同含水率试样的侧限压缩试验,对比分析了不同荷载下各含水率试样的e-lgp曲线,采用双对数坐标法确定了试样的结构屈服应力,对黑方台原状黄土压缩试验结果进行拟合分析。结果表明:随着试样含水率的增高,其对应的e-lgp曲线呈依次降低的趋势,但15%含水率试样与20%含水率试样对应的e-lgp曲线间具有较大空隙,说明含水率为15%20%是试样结构发生较大变形的临界值;各含水率试样在试验过程中都存在结构屈服应力,天然状态下黑方台原状黄土的结构屈服应力为99 k Pa,但随着含水率增高,其结构屈服应力值持续降低;基于岩土破损力学理论基础建立的数学表达式确定出了黑方台原状黄土材料参数B值为0.011 3,并将模拟结果与试验数据进行对比,得到了较好的拟合结果。
On the basis of the original loess in the Heifangtai Platform,the side compression test of different water content samples was carried out,and the e-lgp curves of different water content samples under different loads were compared and analyzed.With double logarithmic coordinates method to assure the structure yield stress of specimen;Based on the mathematical model of structural soil compression characteristics proposed by Enlong Liu etc,we analyzed the results of the compression test of the original loess in the Heifangtai Platform.The results show that with the sample moisture content increasing,the corresponding e-lgp present the trend of reduce in return,the structure yield stress value continues to reduce.which shows that the moisture content of 15%~20%is the critical value of lager deformation of specimen structure;we confirm that the undisturbed loess material parameters B value is 0.011 3.we obtained better fitting results.
作者
王潇
杨博
谷天峰
延恺
WANG Xiao;YANG Bo;GU Tian-feng;YAN Kai(State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University, Xi′an 710069,China;Shaanxi Xintai Energy Co.,Ltd.,Xianyang 712000,China)
出处
《陕西理工大学学报（自然科学版）》
2018年第2期16-20,44,共6页
Journal of Shaanxi University of Technology:Natural Science Edition
基金
国家自然科学基金资助项目(41372269)
关键词
侧限压缩试验
结构屈服应力
拟合分析
side compression test
structure yield stress
fitting analysis
