理论与试验研究

高分子改性剂与EPS协同抑制黏质粉土冻胀试验研究

  • 李乾坤 ,
  • 曹祎 ,
  • 王敦显 ,
  • 王衍森 ,
  • 郭智杰
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  • 1.徐州地铁集团有限公司,江苏 徐州 221000;
    2.中国矿业大学 深地工程智能建造与健康运维全国重点实验室,江苏 徐州 221116;
    3.中煤天津设计工程有限责任公司,天津 300120
李乾坤(1985—),男,江苏徐州人,硕士生,高级工程师,主要从事城市轨道交通勘察设计与管理工作。E-mail: 420090935@qq.com
曹祎(1998—),男,安徽池州人,博士生,主要从事冻土力学及人工地层冻结理论与应用研究。 E-mail: yicao@cumt.edu.cn

收稿日期: 2026-05-15

  网络出版日期: 2026-09-07

基金资助

国家自然科学基金项目(52074264);江苏省研究生科研与实践创新计划项目(KYCX24_2818);中国矿业大学研究生创新计划项目(2024WLKXJ197)

Experimental Study on the Combined Effect of Polymeric Modifiers and EPS Particles in Suppressing Frost Heave of Silty Clay

  • Li Qiankun ,
  • Cao Yi ,
  • Wang Dunxian ,
  • Wang Yansen ,
  • Guo Zhijie
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  • 1. Xuzhou Metro Group Co., Ltd., Xuzhou, Jiangsu 221000, P.R. China;
    2. State Key Laboratory of Intelligent Construction and Healthy Operation & Maintenance of Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, P.R. China;
    3. China Coal Tianjin Design & Engineering Co., Ltd., Tianjin 300120, P.R. China

Received date: 2026-05-15

  Online published: 2026-09-07

摘要

人工地层冻结法作为一种成熟的支护手段,具备优良的封水加固效果,但在实际应用中引发的冻胀效应已成为制约其工程安全性的关键问题,有效抑制冻胀影响成为其成功应用的关键技术难题。聚焦主动式土体改良技术,通过引入聚丙烯酰胺(PAM)、聚乙烯醇(PVA)、木质素磺酸钠(SLS)及聚苯乙烯(EPS)颗粒等新型改性材料,系统探究其对黏质粉土冻胀行为的抑制机理与协同效应。结果表明:PAM与PVA通过形成三维交联网络结构,显著抑制水分迁移与冰晶生长,冻胀率降幅达8.95%~66.28%;SLS作为有机表面活性剂,能够有效改善土体分散性,降低毛细水迁移速度,增强土体的抗冻胀能力,冻胀抑制率呈抛物线特征;EPS颗粒通过孔隙重构与应力缓冲效应,在0.02%掺量下实现50.71%的冻胀抑制率;PVA与EPS复配产生协同增效的作用,冻胀抑制率提升至77.43%,较单一EPS改良提升52.69%,其机制源于高分子凝胶体与EPS颗粒形成的复合团聚体,同步增强土体凝聚力与冻胀应力消散能力,提高了抗冻胀变形能力。本研究构建了高分子聚合物与EPS颗粒联用的复配改性体系,系统评估其对黏质粉土冻胀特性的协同抑制效果,可为相关工程技术应用提供参考。

本文引用格式

李乾坤 , 曹祎 , 王敦显 , 王衍森 , 郭智杰 . 高分子改性剂与EPS协同抑制黏质粉土冻胀试验研究[J]. 地下空间与工程学报, 2026 , 22(4) : 1240 -1251 . DOI: 10.20174/j.JUSE.2026.04.13

Abstract

The artificial ground freezing method is a well-established support technique with excellent water-sealing and reinforcement effects. However, the frost heave effect induced during its practical application has become a critical issue restricting engineering safety. Effectively mitigating frost heave is a key technical challenge for its successful implementation. This study focuses on active soil modification techniques by introducing novel stabilizing materials, including polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium lignosulfonate (SLS), and expanded polystyrene (EPS) particles. The inhibitory mechanisms and synergistic effects of these materials on the frost heave behavior of silty clay were systematically investigated. The results indicate that: PAM and PVA form a three-dimensional cross-linked network structure, significantly restricting moisture migration and ice crystal growth, thereby reducing the frost heave rate by 8.95%~66.28%. As an organic surfactant, SLS effectively improves soil dispersibility, reduces the capillary water migration rate, and enhances the soil's resistance to frost heave. The inhibition rate exhibits a parabolic trend. EPS particles mitigate frost heave through pore structure reconstruction and stress buffering effects, achieving a 50.71% inhibition rate at a 0.02% dosage. Notably, the combination of PVA and EPS exhibits a synergistic enhancement, increasing the frost heave inhibition rate to 77.43%, which is 52.69% higher than that achieved with EPS alone. This mechanism stems from the formation of composite agglomerates between the polymer hydrogel and EPS particles, which simultaneously enhance soil cohesion and the dissipation of frost heave stress, thereby improving resistance to frost heave deformation. This study proposes an innovative composite modification system integrating polymer modifiers with EPS particles, systematically investigates their synergistic effect on mitigating frost heave in clayey silt, and offers technical guidance for practical engineering applications.

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