Experimental study on dispersion of one kind of low liquid limit clay
PENG Wen-ming1, LI Jian1, ZHANG Yan-yi2, LUO Qi-xun1
1. Survey and Design Corporation of PowerChina Chengdu Engineering Corporation Limited, Chengdu 610072, China; 2. Geotechnical Engineering Institute of China Institute of Water Resources and Hydropower Research, Beijing 100038, China
Abstract：The decrease of clay content will weaken the erosion resistance of the soil and bring some influences on the dispersivity tests. For the low liquid limit clay, field investigation and mineral and chemical composition analysis show that the soil material does not have the characteristics of dispersive soil. The double-hydrometer tests, crumb testss, pinhole tests, pore water solution tests and exchangeable sodium ion percentage tests are used to carry out nearly 100 groups of experimental researches. Among them, the results of the double-hydrometer tests are relatively scattered, so it is difficult to give the identification conclusions and it is for reference only. Because of the poor erosion resistance of soil samples, the pinhole tests are difficult to be successfully completed. Both the soil block tests and the pore water solution tests are mainly non-dispersive soil, and a small amount of transitional soil. The percentage of exchangeable sodium ion tests are all non-dispersive soil. The soil material is identified as non-dispersive soil. In addition, the reasons are analysed why the double-hydrometer tests and pinhole tests have not achieved reasonable results, and it is regarded out that the two methods are not suitable for this kind of soil.
彭文明, 李建, 张延亿, 罗启迅. 一种低液限黏土的分散性试验研究[J]. 岩土工程学报, 2020, 42(S1): 121-126.
PENG Wen-ming, LI Jian, ZHANG Yan-yi, LUO Qi-xun. Experimental study on dispersion of one kind of low liquid limit clay. Chinese J. Geot. Eng., 2020, 42(S1): 121-126.
[1] VOLK G M.Method of determination of degree of dispersion of the clay fraction of soils[C]// Proceedings, Soil Science Society of American, New Mexico, 1937: 561-565. [2] SHERARD J L, DUNNIGAN L P, DECKER R S. Some engineering problems with dispersive clays[C]// Dispersive Clays, Related Piping,Erosion in Geotechnical Projects, ASTM STP 623.1977, Chicago: 3-12. [3] J.L.谢拉德. 美国材料试验学会第79次年会(1976年)关于“分散性土有关管涌及冲蚀”的专题讨论会总结[C]// 分散性黏土译文集, 1982: 9-17. (SHERARD J L. Summary of the 79th annual meeting of the american society for testing and materials (1976) on "piping and erosion related to dispersive soils"[C]// Translation of Dispersive Clay, 1982, Chicago.(in Chinese)) [4] 秦曰章. 黄河小浪底黏性土分散性能的试验研究[J]. 人民黄河, 1981(5): 8-12. (QIN Yue-zhang.Experimental study on dispersion properties of Xiaolangdi Clay in the Yellow River[J]. Yellow River, 1981(5): 8-12. (in Chinese)) [5] 王观平, 张来文, 阎仰中, 等. 分散性黏土与水利工程[M]. 北京: 中国水利水电出版社, 1999. (WANG Guan-ping, ZHANG Lai-wen, YAN Yang-zhong, et al.Dispersive Clay and Hydraulic Engineering[M]. Beijing: China Water Power Press, 1999. (in Chinese)) [6] 钱家欢. 分散性黏土作为坝料的一些问题[J]. 岩土工程学报, 1981, 3(1): 94-100. (QIAN Jia-huan.Some problems of dispersive clay as dam material[J]. Chinese Journal and Geotechnical Engineering, 1981, 3(1): 94-100. (in Chinese)) [7] 魏迎奇, 温彦锋, 蔡红, 等. 分散性黏土鉴定试验的可靠性分析[J]. 中国水利水电科学研究院学报, 2007, 5(3): 186-190. (WEI Ying-qi, WEN Yan-feng, CAI Hong, et al.Reliability analysis of identification test of dispersive clay[J]. Journal of China Institute Water Resources and Hydropower Research, 2007, 5(3): 186-190. (in Chinese)) [8] 孔令伟, 李洪良, 樊恒辉, 等. 马家树水库大坝防渗土料分散性判别和改性试验[J]. 岩土力学, 2010, 31(1): 193-198. (KONG Ling-wei, LI Hong-liang, FAN Heng-hui, et al.Study of dispersive identification and treatment with lime of dam soil in Majiashu Reservoir[J]. Rock and Soil Mechanics, 2010, 31(1): 193-198. (in Chinese)) [9] 樊恒辉, 孔令伟.分散性土研究[M]. 北京: 中国水利水电出版社, 2012. (FAN Heng-hui, KONG Ling-wei.Dispersive Soil Research[M]. Beijing: China Water Power Press, 2012. (in Chinese))
