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RISS 인기검색어
- 검색키워드
- 저자 : ( Chongyang Gao ) (검색결과 2 건)
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The Shearing Behavior of Artificial Soil Extracted from Loess
( Chongyang Gao ),( Ling Xu ),( Dongdong Yan ),( Yili Wang ),( Borui Lv ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Loess, as a typical silty soil, covered an area of 440,000km2 in China and a lot of work has been done on the study of mechanics and microstructure of the Loess. For better understanding the behavior of Loess, artificial soils we're created by extracting from the Xi’an and Lanzhou loess using water sedimentary method and which were then divided into five groups according to the variation of gradation. A series of triaxial tests were conducted to identify the effect of particle gradation on the behavior of soil within the framework of critical state soil mechanics. The results show that the location of critical state line is first decrease and then increased with the content of the fine particles increasing. And the slope of the critical state lines also shows consistent trend. There exists a phase transformation gradation soil, called C soil, which is the closest to the natural soil on the gradation curve. For A and B soils with more clay content, there are relatively difficult to reach critical state even if their strain reaches 35%, compared to the other types of soil. As the content of coarse particles increases, the soil generally exhibits more pronounced dilatancy, and the properties are closer to fine sand. This paper is of great significance to provide a reference for better understanding of the behavior of loess in the geotechnique engineering application.
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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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