铁道科学与工程学报2025，Vol.22Issue(4)：1614-1621,8.DOI:10.19713/j.cnki.43-1423/u.T20240947
冻融循环下纤维水泥改良风积沙动力特性研究
The effects of freeze-thaw cycle on the dynamic characteristics of cemented aeolian sand reinforced with basalt fiber
摘要
Abstract
The samples of cemented aeolian sand reinforced with basalt fiber(CASRBF)were made by adding cement(5%of the dry weight of aeolian sand)and basalt fibers(0 and 0.8%of the dry weight of aeolian sand)into aeolian sand from the Heruo(Hotan-Ruoqiang)railway in Xinjiang Uygur Autonomous Region.Cylindrical specimens with a diameter of 39.1 mm and height of 80 mm were made by adopting the hammering compaction method.After standard curing for 28 days,freeze-thaw cyclic test and triaxial cyclic loading test were carried out.The freezing temperature and thawing temperature of the samples were controlled at-20℃and 20℃,respectively.The freezing path was three-way freezing,and the freezing mode was no external make-up water.Sine wave loading was adopted in triaxial cyclic loading test.Dynamic loading frequency was set to 1 Hz,and the number of cyclic loading applications was set to 5 000 times.The dynamic stress-strain hysteretic curves and backbone curves of the samples were investigated.The results show that the backbone curve of CASRBF accords with improved Hardin-Drnevich model.The dynamic elastic modulus(DEM)of the samples decreases exponentially with increasing FTC,while the damping ratio(DR)increases exponentially and the corresponding dynamic stress decreases when the samples reach the specified dynamic strain.Compared with the samples without fiber,the DEM of samples with 0.8%fiber increased by 6.74%,5.52%,4.18%,8.91%,9.65%,respectively.The dynamic stress increased by 18.08%,9.90%,9.75%,22.57%,24.74%when the dynamic strain reached 0.08%,while the DR decreased by 13.9%,8.9%,19.7%,15.9%,22.8%,respectively.These findings could be helpful for engineers to design and construct reinforced aeolian sand as a surface fill layer of railway subgrade bed in seasonal freezing areas.关键词
铁路路基基床/动三轴试验/冻融循环试验/风积沙/玄武岩纤维/骨干曲线/动弹性模量/阻尼比Key words
surface layer of railway subgrade bed/dynamic triaxial test/freeze-thaw cycles/aeolian sand/basalt fiber/backbone curve/dynamic elastic modulus/damping ratio分类
土木建筑引用本文复制引用
阮波,沈一凡,张向京,路占海,张佳森,聂如松..冻融循环下纤维水泥改良风积沙动力特性研究[J].铁道科学与工程学报,2025,22(4):1614-1621,8.基金项目
中国铁路乌鲁木齐局集团有限公司科技研究开发计划课题(WLMQ-KGHZGS-HRTL-GGB-2020-0032) （WLMQ-KGHZGS-HRTL-GGB-2020-0032）
国家自然科学基金资助项目(51978672) （51978672）
