摘要
由于粉土的成因类型不同,其工程性质相差很大,液化特性也与砂土不同。土体液化的孔压增长模型是用有效应力法进行动力计算的基础。针对某高速铁路路基粉土,研究了其液化时的孔压发展规律,在实验室完成了3组不同干密度重塑粉土试样的动三轴试验。根据试验结果,分析了粉土振动液化过程中孔隙水压力的发展规律,通过曲线拟合方法,对不同粉土液化孔压增长模型的适用性进行探讨,给出了相应的模型参数,为后续动力计算提供了必要的理论基础。
Because of different formation conditions,the engineering properties of silt distinguish with each other,and the liquefied characteristics also differ with sand-soil.The effective stress method for soil dynamic calculation is based on the pore water pressure increase model of liquefied soil body.Aiming at the silt foundation of a high-speed railway,dynamic tri-axial tests were conducted for three groups of remolded silt samples with 3 different dry densities.According to the test results,we analyzed development law of the pore water pressure during silt liquefaction process,and through curve fitting method,we evaluate the applicability of different pore water pressure increase models,and provide the corresponding model parameters.The results lay a basis for latter soil dynamic calculation.
出处
《人民长江》
北大核心
2012年第7期59-62,共4页
Yangtze River
关键词
粉土
液化
动三轴试验
孔压模型
地震
silt
liquefaction
dynamic tri-axial test
pore water pressure model
earthquake
