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)，doi:10.16186/j.cnki.1673-9787. 2024060006

HU Q Z, CHEN Y Y, ZHUANG X S, et al． Experimental Study on Physical and Mechanical Properties of Polypropylene Fiber Lightweight Soil[J]. Journal of Henan Polytechnic University( Natural Science) , doi: 10.16186/j.cnki.1673-9787. 2024060006

聚丙烯纤维轻质土物理力学性能试验研究(网络首发)

胡其志1^,2，陈雨怡1，庄心善1^,2，刘一鸣1^,2，陶高粱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 在黏土中添加聚丙烯纤维、EPS颗粒和水泥获得的轻质土，作为填料可以有效降低填方地区的工后沉降。方法 设计聚丙烯纤维、EPS颗粒和水泥为影响轻质土的3个因素，取每个因素的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，并运用SEM电镜扫描从微观层次上分析其力学特性。结果 研究结果发现：影响轻质土强度的大小顺序为“水泥掺量>EPS颗粒掺量>纤维掺量”，对密度影响的大小顺序为“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的增加而显著增长，但随着EPS掺量的增加而减少；添加纤维后能有效的提高轻质土强度，使土体的抗裂性增加，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有所降低。结论 该研究成果为改善聚丙烯纤维轻质土的物理力学性能提供了理论依据，对轻质土在实际工程中的运用具有一定参考作用。

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

网络首发日期： 2025-03-07

Experimental study on physical and mechanical properties of polypropylene fiber lightweight soil (Online)

HU Qizhi^1,2, CHEN Yuyi¹, ZHUANG Xinshan^1,2, LIU Yiming^1,2, TAO Gaoliang1^,2

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

Abstract: Objectives Lightweight soils obtained by adding polypropylene fibers, EPS particles, and cement to clay can be used as fillers to effectively reduce post-work settlement in fill areas. Methods Design polypropylene fiber, EPS particles and cement as three factors affecting the lightweight soil, take four different dosages of each factor as four levels, using L16 (4³) orthogonal experimental design to obtain 16 combinations, respectively, to carry out the unconfined compressive strength test and density test of the lightweight soil samples with different factors and different levels; through the analysis of extreme deviation and analysis of variance, to study the influence of the different factors and levels on the performance law of the lightweight soil; analyze the effect of polypropylene fiber, EPS particles, and cement on the performance of the lightweight soil. Through the polar analysis and Analysis of Variance, the influence of different factors and levels on the performance of lightweight soil is studied; the damage characteristics of polypropylene fiber and EPS particles on the unconfined compressive strength are analyzed, and the mechanical properties were analyzed by SEM scanning. Results The results of the study found that: the order of influence on the strength of lightweight soil is "cement dosing > EPS particles dosing > fiber dosing", and the order of influence on the density is "EPS particles dosing > cement dosing > fiber dosing"; the density and unconfined compressive strength of lightweight soil increase with the dosage of cement. The density and unconfined compressive strength of lightweight soil increased significantly with the increase of cement dosage, but decreased with the increase of EPS dosage; the addition of fiber can effectively improve the strength of lightweight soil, so that the crack resistance of the soil body increases, and make the lightweight soil has a certain degree of residual strength, but more than the optimal dosage of lightweight soil strength has decreased.Conclusions The research results provide a theoretical basis for improving the physical and mechanical properties of polypropylene fiber lightweight soil, and have a certain reference for the application of lightweight soil in practical engineering.

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