赵皓琪,张吾渝,刘昊阳,董超凡

• 1:青海大学土木水利学院
• 2:青海省建筑节能材料与工程安全重点实验室

摘要(Abstract)：

【目的】以青海西宁地区黄土为研究对象,探究冻融循环作用下木质素改良黄土的力学性能及微观机理。【方法】通过封闭系统条件下对木质素改良土进行冻融循环试验,开展基本物性试验、无侧限抗压强度试验、热学试验,综合评价木质素磺酸钙(CL)、木质素磺酸钠(SL)和无磺木质素(SFL)对黄土的加固效果,结合扫描电镜和X射线衍射对土体结构与成分进行分析。【结果】结果显示:随着冻融次数的增加,相同掺量下强度由大到小依次为CL改良土>SFL改良土>SL改良土;导热系数由大到小依次为SFL改良土>CL改良土>SL改良土;SFL改良土pH值最小且导电性能最好。【结论】结果表明:未经冻融循环的黄土试样掺入木质素后均能有效提高黄土强度和隔热能力并降低pH值,SFL改良土均展现出显著的优势,SFL自身具备的C=O双键使固化土表现出低pH值和高导电性,其隔热性能得益于石英的高含量。在冻融循环作用下,CL和SFL改良土通过促进土颗粒间的钙质和镁质胶结形成,有效增强土体的抗冻性和结构稳定性,降低冻胀现象对土体力学性能的负面影响。此外,考虑到SFL显著的性能提升与经济性,优先选择SFL作为冻土地区黄土改良的材料,研究成果可为中国西北地区的黄土改良工作提供一定的理论依据和科学参考。

关键词(KeyWords)： 冻融循环;木质素;改良黄土;力学性能;pH值;微观机理;影响因素

Abstract:

Keywords:

基金项目(Foundation): 青海省科技合作专项(2023-HZ-806);; 国家自然科学基金项目(52168054,52468054);; 国家留学基金委项目(2023 08630007)

作者(Author): 赵皓琪,张吾渝,刘昊阳,董超凡

DOI: 10.13928/j.cnki.wrahe.2025.02.019

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