氯化钠溶液对膨胀土强度影响研究  

Study on the Influence of Sodium Chloride Solution on the Strength of Expansive Soil

作　　者：周荣 庄心善 周睦凯 彭承鸿 ZHOU Rong;ZHUANG Xinshan;ZHOU Mukai;PENG Chenghong(School of Civil Engin.,Architecture and Environment,Hubei Univ.of Tech.,Wuhan 430068,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,湖北武汉430068

出　　处：《湖北工业大学学报》2022年第1期100-103,共4页Journal of Hubei University of Technology

基　　金：国家自然科学基金项目(51708190)。

摘　　要：以河南南阳某公路工程膨胀土为研究对象,对经过不同浓度的氯化钠溶液饱和后的试样进行击实试验和三轴试验。试验结果表明:氯化钠溶液浓度增加,土样主应力差呈先增加后减小趋势,峰值强度逐渐减小,素土样峰值强度最大;内摩擦角随着浓度的增加而增加,黏聚力随着浓度的增加而减小,相较黏聚力的变化,内摩擦角变化不是很明显,说明其浓度变化对土体内摩擦角影响较小;进一步通过拟合曲线发现,氯化钠溶液浓度与土的抗剪强度指标均线性相关,并得到内摩擦角、黏聚力与浓度相关的公式。The compaction test and triaxial test were carried out on the expansive soil of a highway project in Nanyang,Henan Province after being saturated with different concentrations of sodium chloride solution.The results show that with the increase of the concentration of sodium chloride solution,the principal stress difference of soil samples increases first and then decreases,and the peak strength decreases gradually.The peak strength of plain soil samples is the largest.The internal friction Angle increases with the increase of the concentration,while the cohesion decreases with the increase of the concentration.Compared with the change of the cohesion,the change of the internal friction Angle is not very obvious,indicating that the change of the concentration has little effect on the internal friction Angle of soil.Furthermore,the fitting curve shows that the concentration of sodium chloride solution is linearly correlated with the shear strength index of soil,and the functions of internal friction Angle and cohesion are obtained.

关 键 词：膨胀土 氯化钠 双电层 抗剪强度 

分 类 号：TU411[建筑科学—岩土工程]