摘要
对黄土中加入不同质量的Na 2SO 4以配制不同含盐量的硫酸盐渍土试样,对试样开展直剪试验获得抗剪强度指标值,借助统计学理论对抗剪强度指标值进行拟合检验,求得该试验值所服从的概率分布。结果表明,正态、威布尔及伽马分布函数均可用于拟合粘聚力值的分布,正态和威布尔分布函数则适用于拟合内摩擦角值分布,不同含盐量的盐渍土抗剪强度指标的最优分布函数受土体含盐量变化影响较大。盐渍土抗剪强度指标随含盐量增加呈先减少后增加的变化特征,抗剪强度指标最低值所对应的含盐量为3.0%。
This study selected Xining basin of loess with different quality of Na 2SO 4 at seven different salt content of sulphate saline soil specimen preparation,and through laboratory direct shear test of the saline soil specimen in direct shear test for shear strength indexes.On this basis,by means of distribution function based on statistical theory,the above test values are fitted and the probability distribution that the test values obey is obtained.The research results show that the normal and weibull and gamma distribution function can be used in fitting used,the distribution of saline soil cohesive force values of normal distribution and weibull distribution function is suitable for fitting artificial preparation of value distribution of saline soil angle of internal friction,and different salinity of saline soil shear strength indexes of the optimal distribution function is affected by soil salinity changes greatly.In addition,the index of shear strength of artificially prepared saline soil shows a change characteristic of decreasing first and then increasing with the increase of salt content,and the salt content corresponding to the lowest value of the index of shear strength is 3.0%.The results of this study can be applied to the evaluation of engineering geological characteristics of saline soil and the scientific prevention and control of soil salinization and other disasters.
作者
付江涛
孟宏睿
陈丽红
Fu Jiangtao;Meng Hongrui;Chen Lihong(School of Civil Engineering and Architecture,Shaanxi University of Technology,Hanzhong 723000,China)
出处
《山西建筑》
2020年第24期63-66,共4页
Shanxi Architecture
基金
陕西教育厅专项基金资助项目(2013JK0987)。
关键词
盐渍土
抗剪强度指标
分布函数
概率
salinized soil
shear strength indices
distributional function
probability
