土木与环境工程学报（中英文）2026，Vol.48Issue(2)：70-79,10.DOI:10.11835/j.issn.2096-6717.2024.117
磷石膏协同聚丙烯纤维改良黄土的强度特性及其微观机理
Strength characteristics and microscopic mechanisms of loess improvement with phosphogypsum and polypropylene fibers
摘要
Abstract
Phosphogypsum,as one of the industrial solid wastes,can enhance the soil strength but also increase the brittleness while the fiber reinforcement technique can improve the soil plasticity.The synergy between the two materials(phosphogypsum and fiber)can play a complementary role in improving the mechanical properties of soils.The loess from Yangling,Shaanxi Province,was used to explore the optimal mix ratio of phosphogyp-sum in the loess by unconfined compressive strength(UCS)tests.Then,the optimal mix ratio of fiber in the mixture of phosphogypsum and loess was investigated by the direct shear test based on the mixture ratio above.Finally,the microscopic mechanisms of loess improvement with phosphogypsum and polypropylene fibers were examined through scanning electron microscopy(SEM).The results showed that the loess UCS increases first and then decreases with an increase in the phosphogypsum mass when the phosphogypsum is mixed with the loess for reinforcement,and the optimal mix mass ratio of phosphogypsum in the loess is 12% in this study.The polypropylene fibers were then mixed into the mixture of phosphogypsum and loess based on the optimal mix mass ratio of phosphogypsum in the loess.It can be found that the peak strength,cohesion,and residual strength of the mixture sample increase first and then decrease,while the internal friction angle increases,with an increase in the polypropylene fiber content.The microscopic test results also indicated that the phosphogyp-sum-improved loess and phosphogypsum-polypropylene fiber-improved loess both significantly enhance the cementation and fill the voids among soil particles.Polypropylene fibers in loess can form fiber clumps to wrap the soil particles,thereby providing tensile stress and improving the plasticity for the soil sample.关键词
黄土/磷石膏/聚丙烯纤维/强度特性/微观机理Key words
loess/phosphogypsum/polypropylene fiber/strength properties/microscopic mechanisms分类
建筑与水利引用本文复制引用
孟敏强,王铭泽,刘亚丽,章煜阳,刘光宇,茹含..磷石膏协同聚丙烯纤维改良黄土的强度特性及其微观机理[J].土木与环境工程学报（中英文）,2026,48(2):70-79,10.基金项目
国家自然科学基金(52108343) （52108343）
中国博士后科学基金(2021M702689) （2021M702689）
陕西省自然科学基础研究计划(2023-JC-QN-0790) National Natural Science Foundation of China(No.52108343) （2023-JC-QN-0790）
China Postdoctoral Science Foundation(No.2021M702689) （No.2021M702689）
The Shaanxi Provincial Natural Science Basic Research Program(No.2023-JC-QN-0790) （No.2023-JC-QN-0790）
