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

孟敏强; 王铭泽; 刘亚丽; 章煜阳; 刘光宇; 茹含

doi:10.11835/j.issn.2096-6717.2024.117

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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

土木工程 | 更新时间：2026-03-30

- 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
- 土木与环境工程学报 2026年48卷第2期页码：70-79
- 作者机构：
  
  西北农林科技大学水利与建筑工程学院，陕西杨凌 712100
- 作者简介：
  
  孟敏强（1991- ），博士，副教授，主要从事土体的基本力学特性及加固改良技术研究，E-mial：mengmq@nwafu.edu.cn。
- 基金信息：
  
  国家自然科学基金(52108343);中国博士后科学基金(2021M702689);陕西省自然科学基础研究计划(2023-JC-QN-0790)
- DOI：10.11835/j.issn.2096-6717.2024.117
  中图分类号： TU444
- 收稿：2024-07-28，
  
  纸质出版：2026-04-25
- 稿件说明：
移动端阅览
孟敏强,王铭泽,刘亚丽等.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,2026,48(02):70-79.

MENG Minqiang,WANG Mingze,LIU Yali,et al.Strength characteristics and microscopic mechanisms of loess improvement with phosphogypsum and polypropylene fibers[J].Journal of Civil and Environmental Engineering,2026,48(02):70-79.
孟敏强,王铭泽,刘亚丽等.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,2026,48(02):70-79. DOI： 10.11835/j.issn.2096-6717.2024.117.

MENG Minqiang,WANG Mingze,LIU Yali,et al.Strength characteristics and microscopic mechanisms of loess improvement with phosphogypsum and polypropylene fibers[J].Journal of Civil and Environmental Engineering,2026,48(02):70-79. DOI： 10.11835/j.issn.2096-6717.2024.117.

摘要

工业固废磷石膏能有效提升土体强度，但会增大土体脆性，而纤维加筋能改良土体的塑性，两种材料协同可形成互补。以陕西杨凌黄土为研究对象，通过无侧限抗压强度试验探究磷石膏改良黄土的最优掺量；基于最优掺量开展直剪试验，探究纤维加固磷石膏改良黄土的最优掺比；最后通过扫描电镜试验（SEM）探究磷石膏协同聚丙烯纤维改良黄土的微观机理。结果表明：单掺磷石膏改良加固黄土时，随着磷石膏质量占比的增大，改良后黄土的无侧限抗压强度先增大后减小，磷石膏掺入黄土的最优掺量为12%。基于磷石膏改良黄土的最优掺量掺入聚丙烯纤维发现，随着聚丙烯纤维掺量的增大，试样的峰值强度、黏聚力和残余强度均先增大后减小，内摩擦角持续增大；微观试验表明，磷石膏改良黄土和磷石膏协同聚丙烯纤维改良黄土均能增强土粒间的胶结作用，填充土粒间孔隙；聚丙烯纤维在黄土中会形成纤维团包裹土颗粒，从而为土粒提供拉应力，提升土样塑性。

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 phosphogypsum 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 phosphogypsum-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.

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Keywords

references

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