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1.兰州交通大学土木工程学院,甘肃 兰州 730070
2.兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室,甘肃 兰州 730070
Received:16 June 2022,
Revised:2022-08-24,
Published:15 December 2023
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谢嘉豪,李建东,王旭等.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(06):1445-1453.
XIE Jiahao,LI Jiandong,WANG Xu,et al.Effects of Freeze‑thaw Cycles on the Strength and Microstructure of F1‑solidified Loess[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(06):1445-1453.
谢嘉豪,李建东,王旭等.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(06):1445-1453. DOI: 10.13409/j.cnki.jdpme.20220616001.
XIE Jiahao,LI Jiandong,WANG Xu,et al.Effects of Freeze‑thaw Cycles on the Strength and Microstructure of F1‑solidified Loess[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(06):1445-1453. DOI: 10.13409/j.cnki.jdpme.20220616001.
冻融循环作用显著影响固化剂加固效果和固化土物理力学特性。为研究冻融循环作用对F1加固黄土强度与微观结构特性的影响,对不同掺量、不同冻融次数的F1固化黄土试样开展三轴不固结不排水试验及电镜扫描试验,探讨冻融前后F1加固黄土抗剪强度参数及微观孔隙结构变化规律。研究发现,F1可显著改善黄土持水特性和压实特性。当F1掺量为0.3 L/m
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最佳掺量时,与黄土相比,F1固化黄土塑限和最优含水率分别减少2.65%和7.22%,液限和最大干密度分别增大7.92%和9.83%;F1显著增大黄土黏聚力与内摩擦角。0次和15次冻融循环时,与未冻融黄土相比,0.3 L/m
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掺量F1固化黄土的黏聚力分别增大36.82%和16.64%,内摩擦角分别增大16.92%和4.63%;与黄土相比,冻融循环15次时F1固化黄土中微孔隙增大6.28%、小孔隙减少17.84%,孔隙面积比和平均分形分维数分别减小了20.4%和0.67%,表明经F1固化后黄土形成更加稳定的层状堆叠结构,显著改善冻融循环作用下微、小孔隙的演化和发育,提高密实度、增强力学性能和抗剪强度。
Freeze-thaw cycles significantly affects the consolidation effect and the physical and mechanical properties of solidified soil. In order to study impact of freeze-thaw cycles on the strength and microstructural properties of F1-solidified loess, triaxial unconsolidated-undrained loess tests and electron microscopy scanning tests were carried out on F1-solidified loess samples with varying FI dosages 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/m
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, 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 increased 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/m
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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 microporosity 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 after 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.
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