干旱区生态环境知识资源中心(Arid): 含硫酸钠风积沙路基土土-水特征曲线试验研究与模型修正

Arid

	含硫酸钠风积沙路基土土-水特征曲线试验研究与模型修正
其他题名	Experimental Study and Model Correction of Soil-water Characteristic Curve of Aeolian Sand Subgrade Containing Sodium Sulfate
	张宏; 刘海洋
来源期刊	中国公路学报
ISSN	1001-7372
出版年	2020
卷号	33 期号:9
中文摘要	针对中国西北部沙漠地区风积沙路基土出现的硫酸钠盐渍化现象,为探究水盐耦合效应对含硫酸钠风积沙路基土水力、力学性质的影响,实验室配置不同Na_2S O_4盐分含量的风积沙路基土试样,基于ASTM D5298-16规范中滤纸法测试其基质吸力、总吸力并绘制土-水特征曲线,分析含盐量对基质吸力、总吸力土-水特征曲线的影响规律,在v-G模型的基础上进行含盐量修正,建立可以考虑水盐耦合效应的风积沙路基土土-水特征曲线模型并通过试验数据对模型拟合验证。结果表明:Na_2SO_4盐分含量对风积沙基质吸力、渗透吸力和总吸力均有影响,当体积含水率较高时,含盐量主要通过影响渗透吸力而对总吸力影响较大,而当体积含水率较低时,含盐量会对基质吸力产生一定影响;含盐量改变主要对v-G模型中参数a产生影响,含盐量修正后的v-G模型在拟合阿拉善地区含硫酸钠风积沙路基土基质吸力和总吸力土-水特征曲线时适用性较好。研究结果可为该类土体相关工程实践提供理论指导。
英文摘要	The phenomenon of sodium sulfate salinization of aeolian sand subgrade soil has been observed to take place in the desert area of northwest China.To explore the effect of water-salt coupling on the hydraulic and mechanical properties of aeolian sand subgrade soil containing sodium sulfate,aeolian sand subgrade soil samples,with different Na_2SO_4 salt contents,were prepared in the laboratory.The matrix suction and total suction of these samples were tested based on the ASTM D5298-16 filter paper method and the soil-water characteristic curve was drawn.The influence law of salt content on matrix suction and total suction soil-water characteristic curve was analyzed.On the basis of the v-G model,the correction for salt content was carried out,and the soil-water characteristic curve model of the aeolian sand subgrade soil which can consider the water-salt coupling effect was established and verified by the test data.The results show that the presence of Na_2SO_4 salt has an effect on the matrix suction,osmotic suction,and total suction of aeolian sand.When the volumetric water content is high,the salt content mainly affects the total suction by affecting the osmotic suction.When the volumetric water content is low,the salt content has a certain influence on the matrix suction.The change in salt content mainly affects the parameter in the v-G model.After salt content is corrected for,the v-G model becomes suitable for fitting the soil-water characteristic curves of sodium sulfate aeolian sand subgrade soil in Alashan;allowing measurement of the matric and total suction.The research results can provide theoretical guidance for engineering practices relating to this kind of soil.
中文关键词	道路工程 ; 风积沙路基土 ; 滤纸法 ; 土-水特征曲线 ; 含盐量 ; v-G模型修正
英文关键词	road engineering aeolian sand subgrade soil filter paper method soil-water characteristic curve salt content v-G model correction
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Transportation
CSCD记录号	CSCD:6830739
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/354031
作者单位	张宏, 内蒙古大学交通学院;;内蒙古综合交通科学研究院, ;;, 呼和浩特;;呼和浩特, 内蒙古;;内蒙古 010070;;010051, 中国. 刘海洋, 内蒙古大学交通学院, 呼和浩特, 内蒙古 010070, 中国.
推荐引用方式 GB/T 7714	张宏,刘海洋. 含硫酸钠风积沙路基土土-水特征曲线试验研究与模型修正[J],2020,33(9).
APA	张宏,&刘海洋.(2020).含硫酸钠风积沙路基土土-水特征曲线试验研究与模型修正.中国公路学报,33(9).
MLA	张宏,et al."含硫酸钠风积沙路基土土-水特征曲线试验研究与模型修正".中国公路学报 33.9(2020).