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王柯,刘强,孙冲
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WANG Ke,LIU Qiang,SUN Chong
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摘要: 为提高利用滤纸法测定土壤吸力的准确性,采用不同浓度的NaCl溶液和多种饱和盐溶液对Whatman NO.42定量滤纸进行水气饱和,开展总吸力校准试验。同时利用体积压力板仪对该滤纸进行基质吸力校准试验,获得该滤纸的总吸力和基质吸力校准曲线。利用所得的总吸力、基质吸力校准曲线,分别测定了沙滩海砂、硅藻土、黄土等6种土样的吸力及土水保持曲线。探讨了滤纸在总吸力和基质吸力校准时的平衡时间,得到在25℃恒温条件下,基质吸力校准所需平衡时间为7 d,而总吸力校准所需平衡时间至少10 d。
关键词: 非饱和土, 总吸力测定, 基质吸力测定, 滤纸法, 土水特征曲线
Abstract: Whatman NO. 42 quantitative filter paper was saturated with different concentrations of NaCl solution and various saturated salts, and the total suction calibration test was carried out. At the same time, the matrix suction calibration test was carried out by using the volume pressure plate instrument, and the total suction and matrix suction calibration curves of the filter paper were obtained respectively. Based on the calibration curves of total suction and matrix suction, the suction and soil-water retention curves of six kinds of soil samples, such as beach sand, diatomite and loess, were measured. The balance time of filter paper in the calibration of total suction and matrix suction was discussed. It was found that at 25℃,the balance time needed for matrix suction calibration is 7d and for total suction calibration is at least 10d.
Key words: unsaturated soil, determination of total suction, determination of matric suction, filter paper method, SWCC
王柯,刘强,孙冲. 滤纸法在多种土类吸力测量中的应用[J]. 人民长江, doi: 10.16232/j.cnki.1001-4179.2019.09.033.
WANG Ke,LIU Qiang,SUN Chong. Application of filter paper method in suction measurement for different types of soils[J]. , doi: 10.16232/j.cnki.1001-4179.2019.09.033.
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http://www.rmcjzz.com/CN/Y2019/V50/I9/198