摘要
为研究季节性冻土区硫酸盐渍砂土的盐-冻胀特性,文中依托黄河上游陇中某调蓄水池工程,通过不同含水率与含盐条件下的冻融试验,系统分析其盐-冻胀变形规律。结果表明冻胀率随冻融次数增加先增后减,最终趋于稳定。当较高含水率(不小于11%)时,在第3~4次循环冻胀变化达峰值,第5次后稳定;而低含水率(9%)下冻胀变化微弱;固定含盐量时,含水率越高,冻胀率波动及稳定值越大;固定含水率时,含盐量越高,冻胀幅度、峰值及稳定值均显著增大。研究可为季节性冻土区工程的防灾减灾提供理论与试验支撑。
To investigate the salt-induced frost heave behavior of sulfate-contaminated sandy soils in seasonal fro⁃zen regions,this study is based on a regulating reservoir project in the Loess Plateau of the upper Yellow River.Freeze-thaw tests under varying water content and salt concentrations were conducted to systematically analyze the salt-frost heave deformation characteristics.The results indicate that the frost heave rate initially increases and then decreases with the number of freeze-thaw cycles,eventually reaching a stable value.At relatively high water con⁃tents(≥11%),the frost heave reaches its peak during the 3rd to 4th cycles and stabilizes after the 5th cycle,where⁃as soils with lower water content(9%)exhibit minimal frost heave variation.When the salt content is fixed,higher water content leads to larger fluctuations and higher stable frost heave values.Conversely,at a fixed water content,increasing salt content significantly amplifies the frost heave magnitude,peak values,and stable values.These find⁃ings provide theoretical and experimental support for disaster prevention and mitigation in engineering projects locat⁃ed in seasonal frozen regions.
作者
万应红
WAN Yinghong(China Railway 21st Bureau Group Second Engineering Co.,Ltd.,Lanzhou 730000,China)
出处
《低温建筑技术》
2026年第2期144-148,共5页
Low Temperature Architecture Technology
关键词
硫酸盐渍砂土
冻胀
盐胀
冻融循环
含水率
含盐量
sandy sulfate saline soil
frost heaving
salt expansion
freeze-thaw cycles
moisture content
salt content
