地震工程学报2025，Vol.47Issue(5)：1138-1148,11.DOI:10.20000/j.1000-0844.20240420001
玄武岩和聚丙烯混合纤维改良西宁黄土力学和热学特性分析
Mechanical and thermal properties of Xining loess reinforced by basalt-polypropylene hybrid fiber
摘要
Abstract
To systematically investigate the influence of fiber types and hybrid configurations on the mechanical properties of loess,this study conducted comparative reinforcement tests on Xining loess from Qinghai Province using basalt,polypropylene,and their hybrid fibers.Conven-tional triaxial tests were performed to determine the optimal dosage of single fibers and the opti-mal blending ratio of hybrid fibers for Xining loess.The mechanical and thermal properties of un-reinforced loess and hybrid fiber-reinforced loess under varying water contents(i.e.,10％,12％,14％,16％,and 18％)and freeze-thaw cycles were evaluated.Scanning electron microscopy was utilized to assess the reinforcement mechanism at the microstructural level.The research results indicate the following:(1)At a basalt-to-polypropylene ratio of 3∶2,hybrid fiber reinforcement improves the soil strength by 23.2％and 13.2％compared with basalt and polypropylene single-fiber reinforcement,respectively.(2)For hybrid fiber reinforced loess,cohesion and elastic mod-ulus initially increase and then decrease with the increase in water content,peaking at a water content of 14％for maximum strength enhancement and best reinforcement effect;internal fric-tion angle and thermal conductivity exhibit a decreasing trend with the increase in water content,although with smaller variations than unreinforced loess.(3)Under freeze-thaw cycles,cohe-sion,internal friction angle,elastic modulus,and thermal conductivity of the samples all show a decreasing trend.After 20 freeze-thaw cycles,the difference in strength loss rate between hybrid fiber-reinforced loess and unreinforced loess reaches a maximum of 9.8％.These results provide theoretical and practical references for the engineering design of hybrid fiber-reinforced soils.关键词
混合纤维加筋黄土/三轴剪切试验/含水率/冻融循环/SEMKey words
hybrid fiber-reinforced loess/triaxial shear tests/water content/freeze-thaw cycles/scanning electron microscopy(SEM)分类
建筑与水利引用本文复制引用
王云,李辉,孙渊,樊琦,赵明泽..玄武岩和聚丙烯混合纤维改良西宁黄土力学和热学特性分析[J].地震工程学报,2025,47(5):1138-1148,11.基金项目
青海省科技成果转化专项项目(2022-SF-159) （2022-SF-159）
