基于温度变化的路基盐渍土动强度参数试验研究
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摘要
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.
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.
引文
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[3]沈忠言,张家懿.冻结粉土的动强度特性及其破坏准则[J].冰川冻土,1997,19(2):47-54.(SHEN Zhong-yan,ZHANGJia-yi.Dynamic strength characteristic and failure criterion of frozen silt[J].Journal of Glaciology and Geocryology,1997,19(2):47-54.(in Chinese))
[4]吴志坚,马巍,王兰民,等.地震荷载作用下温度和围压对冻土强度影响的试验研究[J].冰川冻土,2003,25(6):648-652.(WU Zhi-jian,MA Wei,WANG Lan-min,et al.Laboratory study on the effect of temperature and confining pressure on strength of frozen soil under seismic dynamic loading[J].Journal of Glaciology and Geocryology,2003,25(6):648-652.(in Chinese))
[5]李焱,骆亚生,谭东岳,等.振动频率对压实黄土动强度特性的影响[J].水土保持通报,2009,29(4):130-133.(LIYan,LUO Ya-sheng,TAN Dong-yue,et al.Effects of Vibration Frequency on Dynamic Strength Properties of Compacted Loess[J].Bulletin of Soil and Water Conservation,2009,29(4):130-133.(in Chinese))
[6]黄大维,杨有海,赖国泉,等.高速铁路路基动态变形模量分析[J].岩土力学,2012,33(5):1402-1408.(HUANGDa-wei1,YANG You-hai,LAI Guo-quan,et al.Analysis of dynamic deformation modulus for high-speed railway subgrade[J].Rock and Soil Mechanics,2012,33(5):1402-1408.(in Chinese))
[7]包卫星,谢永利,杨晓华.天然盐渍土冻融循环时水盐迁移规律及强度变化试验研究[J].工程地质学报,2006,14(3):380-385.(BAO Wei-xing,XIE Yong-li,YANGXiao-hua.A laboratory test study on water and salt migration natural saline soils and associated shear strength changes under freezing and thawing cycles[J].Journal of Engineering Geology,2006,14(3):380-385.(in Chinese))
[8]JTG E40-2007公路土工试验规程[S].2007.(JTG E40-2007 The methods of soils for highway engineering[S].2007.(in Chinese))
[9]陈炜韬,王鹰,王明年,等.冻融循环对盐渍土黏聚力影响的试验研究[J].岩土力学,2007,28(11):2343-2347.(CHEN Wei-tao,WANG Ying,WANG Ming-nian,et al.Testing study on influence of freezing and thawing circulation on saline soil's cohesion[J].Rock and Soil Mechanics,2007,28(11):2343-2347.(in Chinese))
[10]万旭升,赖远明.硫酸钠溶液和硫酸钠盐渍土的冻结温度及盐晶析出试验研究[J].岩土工程学报,2013,35(11):2090-2096.(WAN Xu-sheng,LAI Yuan-ming.Experimental study on freezing temperature and salt crystal precipitation of sodium sulphate solution and sodium sulphate saline soil[J].Chinese Journal of Geotechnical Engineering,2013,35(11):2090-2096.(in Chinese))
[11]高娟,赖远明.冻结盐渍土三轴剪切试验过程中的损伤及压融分析[J].岩土工程学报,2018,40(4):707-715.(GAO Juan,LAI Yuan-ming.Damage and pressure melting analysis of frozen saline soil in the process of triaxial compression tests[J].Chinese Journal of Geotechnical Engineering,2018,40(4):707-715.(in Chinese))