Experimental study on soil-water characteristic curve and permeability curve of white sandstone and mudstone in northern Xinjiang

被引：0
作者：
Tan Z.-X. [1 ]
Wang Z.-Z. [1 ,2 ]
Ge J.-R. [1 ]
Jiang H.-Y. [1 ]
Liu Q.-H. [1 ]
Meng X.-D. [1 ]
机构：
[1] Cold and Arid Regions Water Engineering Safety Research Center, Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University, Yangling
[2] State Key Laboratory of Frozen Soil Engineering, CAS, Lanzhou
来源：
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | 2020年 / 42卷
关键词：
Filter paper method; Matrix suction; Permeability coefficient function; Soil-water characteristic curve; White sandstone and mudstone;
D O I：
10.11779/CJGE2020S1045
中图分类号：
学科分类号：
摘要：
The foundation soil of large channels in northern Xinjiang is mostly white sandstone and mudstone, and its hydraulic characteristics determine the formation and development of channel structural diseases. To this end, the white sandstone and mudstone of Beitun Irrigation in Altay, Xinjiang are taken as the objects to test their physical mechanics and impermeability indexes. According to the theory of unsaturated soil, the soil-water characteristic curve is obtained by the filter paper method, and based on the Gardner, Van Genuchten and Fredlund & Xing models the parameters of the soil-water characteristic curve is filled and their water-retention characteristics are analyzed; combined with the soil-water characteristic curve. Combined with its soil-water characteristic curve, the Childs & Collis-Geroge model is used to study the unsaturated permeability curve. The results show that the white sandstone and mudstone are expansive and low-permeability soil. The white sandstone has high shear strength and low compressibility. The best fitting effect of the SWCC of white sandstone and mudstone are the GA model and VG model, respectively, and mudstone has better water-retention performance than the that white sandstone. The relative permeability coefficient decreases sharply with the increase of matrix suction. Within a certain range of matrix suction, they are linear curves in a double-logarithmic coordinate system. © 2020, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.
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页码：229 / 233
页数：4
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