干旱区生态环境知识资源中心(Arid): 风积沙路基土土-水特征曲线温度效应研究

Arid

	风积沙路基土土-水特征曲线温度效应研究
其他题名	Temperature Effect of Soil-water on Characteristic Curve of Aeolian Sand Subgrade Soil
	张宏; 刘海洋; 李聪
来源期刊	中国公路学报
ISSN	1001-7372
出版年	2020
卷号	33 期号:7 页码:42-49
中文摘要	风积沙非饱和土是沙漠地区公路路基主要填筑材料,其力学性能受赋存气候环境温度影响显著。为研究温度变化对风积沙路基土土-水特性影响规律,在考虑温度对非饱和土表面张力和润湿系数综合影响的基础上,推导建立能够反映温度变化效应的土-水特征曲线模型方程,并基于ASTM D5298滤纸法测试不同干密度风积沙路基土土样在20 ℃、40 ℃和60 ℃条件下达到平衡时的土-水特征曲线,验证建立模型的合理性。结果表明:风积沙土-水特征理论模型曲线与实测值吻合良好,相关系数均在0.93以上,模型合理有效;在高温或低吸力区,温度对风积沙土-水特性影响显著,随着温度升高,土-水特征曲线整体向右下方偏移;在含水率较低的高吸力区,风积沙基质吸力对干密度变化更加敏感,干密度越大,基质吸力越大。所得结论为利用非饱和土理论研究风积沙路基土力学性能奠定了理论基础。
英文摘要	Unsaturated aeolian sand is the main highway subgrade filling material in desert areas,and its mechanical properties are significantly affected by ambient temperature.To study the influence of temperature changes on the soil-water characteristics of aeolian sand subgrade soil,the broad influence of temperature on the surface tension and wetting coefficient of unsaturated soil was considered.Furthermore,the soil-water characteristic curve model equation,which can reflect the effect of temperature changes,was derived.Based on the ASTM D5298 filter paper method,the variations in the soil-water characteristic curves for different dry densities were measured when the aeolian sand subgrade soil samples reached equilibrium at 20 ℃,40 ℃,and 60 ℃ to verify the rationality of the established model.The theoretical model curves of the aeolian sand soil-water characteristics agree well with the measured values.Additionally,the correlation coefficients all exceed 0.93,indicating that the model is reasonable and effective.In the high-temperature or low-suction zone,the temperature has a significant influence on the aeolian sand soil-water characteristics.As the temperature increases,the soil-water characteristic curve shifts to the lower right.In the high-suction zone with low water content,the aeolian sand matrix suction is more sensitive to dry density changes.The greater is the dry density,the greater is the matrix suction.This research can lay a theoretical foundation for studying the mechanical properties of aeolian sand subgrade soil by using the unsaturated soil theory.
中文关键词	道路工程 ; 风积沙 ; 土-水特征曲线模型 ; 温度效应
英文关键词	road engineering aeolian sand soil-water characteristic curve model temperature effect
类型	Article
语种	中文
收录类别	CSCD
WOS研究方向	Transportation
CSCD记录号	CSCD:6783861
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336786
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;;010050, 中国.; 刘海洋, 内蒙古大学交通学院, 呼和浩特, 内蒙古 010070, 中国.; 李聪, 国家山区公路工程技术研究中心;;招商局重庆交通科研设计院有限公司, 国家山区公路工程技术研究中心;;, ;;, 重庆;;重庆 400067;;400067, 中国.
推荐引用方式 GB/T 7714	张宏,刘海洋,李聪. 风积沙路基土土-水特征曲线温度效应研究[J],2020,33(7):42-49.
APA	张宏,刘海洋,&李聪.(2020).风积沙路基土土-水特征曲线温度效应研究.中国公路学报,33(7),42-49.
MLA	张宏,et al."风积沙路基土土-水特征曲线温度效应研究".中国公路学报 33.7(2020):42-49.