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Mechanical Properties and Wet and Dry Cycling Tests of Reinforced Sandy Soil Improvement in Southeast Xizang
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Ding SANG1, 2, Huan NIU1, 2, Chao LI1, 2, Zhe-wei ZHAO1, 2, Pei-qing WANG1, 2, *, Wen-gang ZHANG3
Science Technology and Engineering | 2025, 25(3) : 1188 - 1196
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Science Technology and Engineering | 2025, 25(3): 1188-1196
• Papers·Architectural Science •
Mechanical Properties and Wet and Dry Cycling Tests of Reinforced Sandy Soil Improvement in Southeast Xizang
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Ding SANG1, 2, Huan NIU1, 2, Chao LI1, 2, Zhe-wei ZHAO1, 2, Pei-qing WANG1, 2, *, Wen-gang ZHANG3
Affiliations
  • 1. Research Center of Civil, Hydraulic and Power Engineering of Xizang, Xizang Agriculture and Animal Husbandry University, Linzhi 860000, China
  • 2. College of Water Conservancy and Civil Engineering, Xizang Agriculture and Animal Husbandry University, Linzhi 860000, China
  • 3. School of Civil Engineering, Chongqing University, Chongqing 400045, China
Published: 2025-01-28 doi: 10.12404/j.issn.1671-1815.2402344
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To investigate the impact of polymer polyvinyl alcohol (PVA) and polypropylene fiber on the composite enhancement of loosely piled sandy soil in Southeast Xizang, unconfined compressive strength tests and direct shear tests were conducted. The the effects of the improved sandy soil was understood and the optimal mixing ratio of the improved materials was determined. Additionally, the change in the strength of the improved sandy soil under water erosion after dry and wet cycles was analyzed, and the reinforcement mechanism was investigated. The results demonstrate that the dosage of PVA and polypropylene fibers has a significant effect on the unconfined compressive strength. The best improvement effect is achieved with a dosage ratio of 12% PVA + 0.25% polypropylene fibers, resulting in an unconfined compressive strength of 1 716 kPa. This is 67 times higher than that of sandy soil with an unconfined compressive strength of 25.46 kPa. The shear strength of the improved specimens with different fiber contents increased with the increase of PVA doping. After 10 dry and wet cycling processes, the 12% PVA + 0.25% polypropylene fiber specimen exhibited an unconfined compressive strength of about 748.66 kPa, which was still 91.8% of the strength at 7 days and 1.47 times that of the same age maintenance period of 28 days. Polyvinyl alcohol solution formed a polymer film that adhered to and wrapped the sandy soil, while polypropylene fiber wound and filled the sandy soil. The combination of these two materials improved the stability of the sandy soil, effectively enhancing the bonding strength between soil particles and increasing the compressive strength of the soil body.

sand  /  unmeasured limited compressive strength  /  direct shear test  /  dry and wet cycle  /  mechanism analysis
Ding SANG, Huan NIU, Chao LI, Zhe-wei ZHAO, Pei-qing WANG, Wen-gang ZHANG. Mechanical Properties and Wet and Dry Cycling Tests of Reinforced Sandy Soil Improvement in Southeast Xizang[J]. Science Technology and Engineering, 2025 , 25 (3) : 1188 -1196 . DOI: 10.12404/j.issn.1671-1815.2402344
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Year 2025 volume 25 Issue 3
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Article Info
doi: 10.12404/j.issn.1671-1815.2402344
  • Receive Date：2024-04-02
  • Online Date：2025-07-29
  • Published：2025-01-28
Article Data
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History
  • Received：2024-04-02
  • Revised：2024-07-18
Funding
Affiliations
    1. Research Center of Civil, Hydraulic and Power Engineering of Xizang, Xizang Agriculture and Animal Husbandry University, Linzhi 860000, China
    2. College of Water Conservancy and Civil Engineering, Xizang Agriculture and Animal Husbandry University, Linzhi 860000, China
    3. School of Civil Engineering, Chongqing University, Chongqing 400045, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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