防灾减灾工程学报2023，Vol.43Issue(6)：1445-1453,9.DOI:10.13409/j.cnki.jdpme.20220616001
冻融循环作用对F1加固黄土强度与微观结构的影响研究
Effects of Freeze-thaw Cycles on the Strength and Microstructure of F1-solidified Loess
摘要
Abstract
Freeze-thaw cycles significantly affects the consolidation effect and the physical and mechan-ical properties of solidified soil.In order to study impact of freeze-thaw cycles on the strength and mi-crostructural properties of F1-solidified loess,triaxial unconsolidated-undrained loess tests and elec-tron microscopy scanning tests were carried out on F1-solidified loess samples with varying FI dosag-es and freeze-thaw durations.These tests aimed to explore the shear strength parameters and changes in the microscopic pore structure of F1-solidified loess before and after freeze-thaw cycles.The study revealed that F1 can significantly improve the water-holding and compaction properties of loess.At the optimum dosage of 0.3L/m3,the plastic limit and optimum moisture content of F1-solidified loess are reduced by 2.65%and 7.22%respectively,while the liquid limit and maximum dry density are in-creased by 7.92%and 9.83%respectively.F1 significantly increases the cohesion and internal friction angle of loess.At 0 and 15 freeze-thaw cycles,compared with unfrozen thawed loess,the cohesion of F1-solidified loess with 0.3L/m3 content increased by 36.82%and 16.64%respectively,the internal friction angle increased by 16.92%and 4.63%respectively.compared with the loess,the microporosi-ty in F1-solidified loess increased by 6.28%and small porosity decreased by 17.84%at 15 freeze-thaw cycles.Additionally,the pore area ratio and average fractal dimension decreased by 20.4%and 0.67%respectively.These changes indicate that the loess forms a more stable laminated stacking structure af-ter F1 curing,which significantly improves the evolution and development of micro and small pores under freeze-thaw cycles,increases the compactness,enhances the mechanical properties and shear strength.关键词
冻融循环/黄土/F1离子固化剂/抗剪强度/微观结构Key words
freeze-thaw cycle/loess/F1 ionic soil stabilizer/shear strength/microstructure分类
建筑与水利引用本文复制引用
谢嘉豪,李建东,王旭,张延杰,蒋代军,王兴为..冻融循环作用对F1加固黄土强度与微观结构的影响研究[J].防灾减灾工程学报,2023,43(6):1445-1453,9.基金项目
国家自然科学基金项目(51868038)、甘肃省基础研究创新群体项目(21JR7RA347)资助 （51868038）
