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Influence of Salts on Compressibility of Loess in Heifangtai Terrace, China
( Borui Lv ),( Ling Xu ),( Chongyang Gao ),( Dongdong Yan ),( Yili Wan ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Many researches had demonstrated that salts, including soluble and insoluble salts, played a considerable role on loess structure and mineral composition. It was found salts were leached out of the loess because of agricultural irrigation, in Heifangtai terrace in China, where a large number of landslides occurred. To study the effect of salts on compressibility of loess, a series of one-dimensional oedometer tests were performed. The loess washed by water or acetic acid solution, which was to avoid the interference of original salts, was powdered and reconstituted with distilled water, then the samples were immersed in NaCl solution or added a certain mass of lime and contacted with carbon dioxide to form calcium carbonate. Comparing the compression behavior, the results showed that the variation of compressibility of samples reconstituted by loess treated by distilled water or acid solution was indistinctive. The NaCl solution had a little effect on loess compressibility at high water content, while the NaCl solution would weaken loess compressibility at low water content, compared with samples treated by distilled water, and a threshold water content was gained. Besides, the compressibility of loess treated by adding lime was strongly improved. These findings can rich the study in microstructure of loess and are of importance to guide the geotechnical application.
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