College of Environmental Science and Engineering, Changan University, Xian, Shaanxi 710054, China;Key Laboratory of Subsurface Hydrology and Ecology in Arid Areas, Ministry of Education, Xian, Shaanxi 710054, China 在期刊界中查找 在百度中查找 在本站中查找
College of Environmental Science and Engineering, Changan University, Xian, Shaanxi 710054, China;Key Laboratory of Subsurface Hydrology and Ecology in Arid Areas, Ministry of Education, Xian, Shaanxi 710054, China 在期刊界中查找 在百度中查找 在本站中查找
College of Environmental Science and Engineering, Changan University, Xian, Shaanxi 710054, China;Key Laboratory of Subsurface Hydrology and Ecology in Arid Areas, Ministry of Education, Xian, Shaanxi 710054, China 在期刊界中查找 在百度中查找 在本站中查找
College of Environmental Science and Engineering, Changan University, Xian, Shaanxi 710054, China;Key Laboratory of Subsurface Hydrology and Ecology in Arid Areas, Ministry of Education, Xian, Shaanxi 710054, China 在期刊界中查找 在百度中查找 在本站中查找
College of Environmental Science and Engineering, Changan University, Xian, Shaanxi 710054, China;Key Laboratory of Subsurface Hydrology and Ecology in Arid Areas, Ministry of Education, Xian, Shaanxi 710054, China 在期刊界中查找 在百度中查找 在本站中查找
[Objective] The multi-level collapsibility of loess was investigated and the way of loess collapsibility deformation was studied at the microscale in order to provide a scientific basis for the study of loess collapsible deformation mechanism.[Methods] We designed and conducted a indoor cyclic collapsibility test, to observe the micro-structure of the same samples under repeated humidification and dehumidification processes. The collapsibility data were analyzed and the scanning electron microscopy images were compared.[Results] The collapsibility data showed that after the loess reached the first collapsibility and water removal stability, adding water into the device would cause the deformation of the sample again. During the collapsibility process, the micro-structure undergone three deformation modes:dissolution, movement and reconstruction.[Conclusion] It is the dynamic process of destruction-reconstruction-destruction of loess structure that leads to multi-level collapsibility of loess.
[1] Tovey N K, Dent D L, Corbett W M, et al. Quantitative micro-mineralogy and micro-fabric of soils and sediments[J]. Developments in Soil Science, 1993,22:541-547.
[2] Tovey N K, Krinsley D H. Mapping of the orientation of fine-grained minerals in soils and sediments[J]. Bulletin of the International Association of engineering Geology, 1992,46:93-101.
[3] Tovey N K, Smart P, Hounslow M W, et al. Automatic orientation mapping of some types of soil fabric[J]. Geoderma, 1992,53(3):179-200.
[10] Li Xian, Li Licui, Song Yanxun, et al. Characterization of the mechanisms underlying loess collapsibility for land-creation project in Shaanxi Province, China:A study from a micro perspective[J]. Engineering Geology, 2019,249:77-88.
[11] Li Xian, Li Lincui. Quantification of the pore structures of Malan loess and the effects on loess permeability and environmental significance, Shaanxi Province, China:An experimental study[J]. Environmental Earth Sciences, 2017,76(15):523.
[13] Galván Josa V, Castellano G, Bertolino S R. Quantification by SEM-EDS in uncoated non-conducting samples[J]. Radiation Physics and Chemistry, 2013,88:32-37.
[18] Zhang Xiaozhou, Lu Yudong, Li Xin, et al. Microscopic structure changes of Malan loess after humidification in South Jingyang Plateau, China[J]. Environmental Earth Sciences, 2019,78:DOI:10.1007/s12665-019-8290-4.