Microstructure of Compacted Loess and Its Influence on the Soil-Water Characteristic Curve
Soil-water characteristic curve (SWCC) is a key constitutive relationship for studying unsaturated soil, and as is known, microstructure of the soil has great influence on the mechanical behaviour of the soil. In this study, the wetting and drying soil-water characteristic curves (SWCCs) of loess co...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/3402607 |
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| author | Xiao Xie Ping Li Xiaokun Hou Tonglu Li Guowei Zhang |
| author_facet | Xiao Xie Ping Li Xiaokun Hou Tonglu Li Guowei Zhang |
| author_sort | Xiao Xie |
| collection | DOAJ |
| description | Soil-water characteristic curve (SWCC) is a key constitutive relationship for studying unsaturated soil, and as is known, microstructure of the soil has great influence on the mechanical behaviour of the soil. In this study, the wetting and drying soil-water characteristic curves (SWCCs) of loess compacted at three different water contents were measured using the filter paper method. And microproperties of compacted loess were obtained by the mercury intrusion method (MIP) and scanning electron microscope (SEM). Results show that the compaction water contents have significant influence on the SWCC and microstructure. The pore size distribution (PSD) curves have great differences in macropore range and are similar in micropore range. Loess compacted at optimum and dry of optimum are generally connected, while there are certain number of nonintruded pores in loess compacted at wet of optimum. The SWCC curves vary significantly in low suction (ua − uw < 1000 kPa) and tend to converge together in high suction (ua − uw ≥ 1000 kPa). Hysteresis in the SWCCs is more obvious for loess compacted at optimum and dry of optimum in the matric suction of 0∼100 kPa; however, there is a pronounced hysteresis for loess compacted at wet of optimum in full matric suction range. The characteristic of the SWCCs including their hysteresis can be well interpreted from the loess microstructure. |
| format | Article |
| id | doaj-art-515d229490f849faa406b9e8dd1f71f7 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-515d229490f849faa406b9e8dd1f71f72025-02-03T05:53:09ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422020-01-01202010.1155/2020/34026073402607Microstructure of Compacted Loess and Its Influence on the Soil-Water Characteristic CurveXiao Xie0Ping Li1Xiaokun Hou2Tonglu Li3Guowei Zhang4Shaanxi Provincial Land Engineering Construction Group Co. Ltd., Xi’an 710075, ChinaDepartment of Geological Engineering, Chang’an University, Xi’an 710054, ChinaDepartment of Geological Engineering, Chang’an University, Xi’an 710054, ChinaDepartment of Geological Engineering, Chang’an University, Xi’an 710054, ChinaChina Coal Xi’an Design Engineering Co. Ltd., Xi’an 710054, ChinaSoil-water characteristic curve (SWCC) is a key constitutive relationship for studying unsaturated soil, and as is known, microstructure of the soil has great influence on the mechanical behaviour of the soil. In this study, the wetting and drying soil-water characteristic curves (SWCCs) of loess compacted at three different water contents were measured using the filter paper method. And microproperties of compacted loess were obtained by the mercury intrusion method (MIP) and scanning electron microscope (SEM). Results show that the compaction water contents have significant influence on the SWCC and microstructure. The pore size distribution (PSD) curves have great differences in macropore range and are similar in micropore range. Loess compacted at optimum and dry of optimum are generally connected, while there are certain number of nonintruded pores in loess compacted at wet of optimum. The SWCC curves vary significantly in low suction (ua − uw < 1000 kPa) and tend to converge together in high suction (ua − uw ≥ 1000 kPa). Hysteresis in the SWCCs is more obvious for loess compacted at optimum and dry of optimum in the matric suction of 0∼100 kPa; however, there is a pronounced hysteresis for loess compacted at wet of optimum in full matric suction range. The characteristic of the SWCCs including their hysteresis can be well interpreted from the loess microstructure.http://dx.doi.org/10.1155/2020/3402607 |
| spellingShingle | Xiao Xie Ping Li Xiaokun Hou Tonglu Li Guowei Zhang Microstructure of Compacted Loess and Its Influence on the Soil-Water Characteristic Curve Advances in Materials Science and Engineering |
| title | Microstructure of Compacted Loess and Its Influence on the Soil-Water Characteristic Curve |
| title_full | Microstructure of Compacted Loess and Its Influence on the Soil-Water Characteristic Curve |
| title_fullStr | Microstructure of Compacted Loess and Its Influence on the Soil-Water Characteristic Curve |
| title_full_unstemmed | Microstructure of Compacted Loess and Its Influence on the Soil-Water Characteristic Curve |
| title_short | Microstructure of Compacted Loess and Its Influence on the Soil-Water Characteristic Curve |
| title_sort | microstructure of compacted loess and its influence on the soil water characteristic curve |
| url | http://dx.doi.org/10.1155/2020/3402607 |
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