胡其志,陈雨怡,庄心善,等.聚丙烯纤维轻质土物理力学性能试验研究[J].河南理工大学学报（自然科学版）,2026,45(6):167-174.

Hu Q Z, Chen Y Y, Zhuang X S,et al.Experimental study on the physical and mechanical properties of polypropylene fiber-reinforced lightweight soil[J].Journal of Henan Polytechnic University(Natural Science) ,2026,45(6):167-174.

聚丙烯纤维轻质土物理力学性能试验研究

胡其志1,2, 陈雨怡1, 庄心善1,2, 刘一鸣1,2, 陶高梁1,2

1.湖北工业大学 土木建筑与环境学院，湖北 武汉  430068；2.湖北省桥梁安全监控技术及装备技术工程研究中心，湖北 武汉 430068

摘要: 目的 为改善轻质土的抗裂性能和破坏形式，进行聚丙烯纤维轻质土物理力学性能试验研究。  方法 取聚丙烯纤维、EPS（expandable polystyrene）颗粒和水泥的4种不同掺量为4个水平，采用L16（43）正交试验设计获得16种组合，分别开展不同因素和不同水平轻质土试样的无侧限抗压强度试验和密度试验；通过极差分析和方差分析，研究不同因素和不同水平对轻质土的性能影响规律；分析聚丙烯纤维、EPS颗粒掺量对其无侧限抗压强度破坏特征的影响，并使用扫描电子显微镜从微观层次分析其力学特性。  结果 结果发现：对轻质土强度影响由大到小排序为水泥掺量、EPS颗粒掺量、纤维掺量，对密度影响由大到小排序为EPS颗粒掺量、水泥掺量、纤维掺量；轻质土的密度和无侧限抗压强度随着水泥掺量增加显著增长，但随着EPS颗粒掺量增加而减少；添加纤维后能有效提高轻质土强度，增加土体抗裂性，并使轻质土具有一定的残余强度，但超过最佳掺量后轻质土强度开始降低。  结论 研究结果可为改善聚丙烯纤维轻质土的物理力学性能提供理论依据，对轻质土在实际工程中的应用具有一定参考价值。

关键词:聚丙烯纤维;轻质土;正交试验;无侧限抗压强度

doi:10.16186/j.cnki.1673-9787.2024060006

基金项目:国家自然科学基金资助项目（52078195，U22A20232）

收稿日期:2024/06/05

修回日期:2024/08/29

出版日期:2026/10/09

Experimental study on the physical and mechanical properties of polypropylene fiber-reinforced lightweight soil

Hu Qizhi1,2, Chen Yuyi1, Zhuang Xinshan1,2, Liu Yiming1,2, Tao Gaoliang1,2

1.School of Civil Engineering， Architecture and Environment， Hubei University of Technology， Wuhan  430068， Hubei， China；2.Hubei Engineering Research Center for Bridge Safety Monitoring Technology and Equipment， Wuhan  430068， Hubei， China

Abstract: Objectives To improve the crack resistance and failure behavior of lightweight soil， an experimental study on the physical and mechanical properties of polypropylene fiber-reinforced lightweight soil was conducted.  Methods Polypropylene fiber content， EPS （expandable polystyrene） particle content， and cement content were selected as three influencing factors， with four levels assigned to each factor. An L16（4³） orthogonal experimental design was adopted to obtain 16 combinations. Unconfined compressive strength tests and density tests were performed on lightweight soil specimens with different factors and levels. The effects of different factors and levels on the properties of lightweight soil were investigated through range analysis and analysis of variance （ANOVA）. The effects of polypropylene fiber and EPS particle contents on the failure characteristics of lightweight soil under unconfined compression were analyzed， and the mechanical properties were further examined at the microscopic level using scanning electron microscopy （SEM）.  Results The results showed that the factors affecting the strength of lightweight soil followed the order of cement content， EPS particle content， and fiber content， while the factors affecting density followed the order of EPS particle content， cement content， and fiber content. The density and unconfined compressive strength of lightweight soil increased significantly with increasing cement content but decreased with increasing EPS particle content. The addition of polypropylene fiber effectively improved the strength and crack resistance of lightweight soil and provided certain residual strength. However， when the fiber content exceeded the optimum value， the strength of lightweight soil began to decrease. Conclusions The results provide a theoretical basis for improving the physical and mechanical properties of polypropylene fiber-reinforced lightweight soil and offer valuable references for its practical engineering applications.

Key words: polypropylene fiber; lightweight soil; orthogonal test; unconfined compressive strength