振动荷载下高铁路基粗粒土填料应变规律研究
Study on the Strain Law of Coarse-grain Soil Packing in High-speed Railway Subgrade Under Vibrational Load
林鹏1
作者信息
- 1. 四川省铁路建设有限公司,四川 成都 610000
- 折叠
摘要
为提高高铁路基土的安全服役性能,文中利用室内动三轴试验对高铁路基粗粒土填料进行了振动荷载作用下的动力特性试验,对比分析了不同细粒含量以及围压条件下的高铁路基粗粒土填料的累积应变曲线变化规律.结果表明,当动应力为 30 kPa时,所有细粒土掺量及围压条件下土体的累积塑性应变均随着加载作用次数的增加呈现出先快速增加后缓慢增加的变化规律;当动应力为60、90 kPa时,所有细粒土掺量及围压条件下土体的累积塑性应变均随着加载作用次数的增加呈现出先快速增加后趋于稳定的变化规律.
Abstract
In order to improve the safe service performance of high railway foundation soil,the dynamic characteristics of coarse grained soil filler under vibration load were tested by indoor dynamic triaxial test.The cumulative strain curve of coarse grained soil filler under different fine particle content and confining pressure was compared and analyzed.The results show that when the dynamic stress is 30 kPa,the cumula-tive plastic strain of all fine grained soil and confining pressure increases rapidly at first and then slowly with the increase of loading times.When the dynamic stress is 60 kPa and 90 kPa,the cumulative plastic strain of the soil under all fine grained soil content and confining pres-sure conditions increases rapidly at first and then tends to be stable with the increase of loading times.
关键词
高铁路基/振动荷载/粗粒土填料/动力特性/细粒含量Key words
High railway base/Vibration load/Coarse-grained soil filler/Dynamic characteristics/Fine grain content引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据