基于温度变化的路基盐渍土动强度参数试验研究

Experimental study on dynamic strength parameters of subgrade saline soil under temperature variation

基于英国GDS动三轴试验系统,对青海西部地区的路基盐渍土进行动三轴试验,在温度变化条件下探讨其破坏动应力、动黏聚力及动内摩擦角等相关参数随围压、频率的变化规律,建立了不同动载频率下破坏动应力–围压–温度关系曲面,得到了与温度相关的曲面拟合方程。试验结果表明:土–冰–盐的胶结作用对温度变化极其敏感,随着温度降低,盐渍土的破坏动应力明显增大;动黏聚力和动内摩擦角随温度的降低而增大。

Based on the British GDS dynamic triaxial test instrument,the triaxial dynamic load tests on subgrade saline soil in western areas of Qinghai Province are performed.Under temperature change,the variation laws of parameters of dynamic stress of failure,dynamic cohesion and dynamic internal friction angle with confining pressure and frequency are discussed.The destructive dynamic stress-confining pressure-temperature relational surface at different dynamic load frequencies is established,and the equation for fitting the surface with temperature is obtained.The test results show that the temperature change is extremely sensitive to the cementation of soil-ice-salt,and with the decrease of temperature,the destructive dynamic stress of saline soil obviously increases.The dynamic cohesion and internal friction angle increase with the decrease of temperature.