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Abstract
The pore structure is one of the most important properties of soil, which can directly affect the other properties such as water content, permeability and strength. It is of great significance to study the soil pore structure for agricultural cultivation, water and soil conservation and engineering construction. This paper investigates the 3D pore characterization of intact loess and four kinds of compacted loess (with different dry density) in northwest China. Micro scale computed tomography and mercury intrusion porosimetry tests were performed to get the porosity, specific surface area, pore size distribution, connected pores content and isolated pores content of different samples. Results show that the intact loess has more connected pores than the compacted loess, and the compacted loess whose dry density appears to be modelled well still have different pore structure with the intact loess. In addition, as the compactness increasing, the large pores (>13 μm) were firstly broken into medium pores (8~13 μm) and some small pores (<8 μm) until the pore structure was close to the natural structure of the intact loess, after that medium pores began to be broken into small pores.
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Details
1 Chinese Academy of Sciences, Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Beijing, China (GRID:grid.9227.e) (ISNI:0000000119573309); Chinese Academy of Sciences, Beijing, China (GRID:grid.9227.e) (ISNI:0000000119573309); University of Chinese Academy of Sciences, Beijing, China (GRID:grid.410726.6) (ISNI:0000 0004 1797 8419)
2 Chang’an University, Department of Geological Engineering, Xi’an, China (GRID:grid.440661.1) (ISNI:0000 0000 9225 5078)
3 Chinese Academy of Sciences, Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Beijing, China (GRID:grid.9227.e) (ISNI:0000000119573309); Chinese Academy of Sciences, Beijing, China (GRID:grid.9227.e) (ISNI:0000000119573309); University of Chinese Academy of Sciences, Beijing, China (GRID:grid.410726.6) (ISNI:0000 0004 1797 8419); Chang’an University, Department of Geological Engineering, Xi’an, China (GRID:grid.440661.1) (ISNI:0000 0000 9225 5078)