饱和粉土液化孔压增长模型的适用性研究
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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.
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.
引文
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[2]刘颖.再论抗震规范的砂土液化判别方法[R].哈尔滨:中国地震局工程力学研究所,1982.
[3]王余庆,栾芳,韩清宇,等.预测轻亚粘土液化势的统计公式[J].岩土工程学报,1980,2(3):102-112.
[4]钟龙辉.轻亚粘土地震液化判定方法的分析[J].岩土工程学报,1980,2(3):113-122.
[5]郁寿松,石兆吉.水平土层液化势的判别分析[J].地震工程与工程振动,1980,(1):121-130.
[6]景立平,崔杰,李立云,等.徐州市棠张镇饱和粉土液化性能试验研究[J].地震工程与工程振动,2004,24(6):160-164.
[7]陈国兴,刘雪珠.南京粉质黏土与粉砂互层土及粉细砂的振动孔压发展规律研究[J].岩土工程学报,2004,26(1):79-82.
[8]张克绪,谢君斐.土动力学[M].北京:地震出版社,1989.
[9]罗强.饱和粉土动力特性试验研究[D].哈尔滨:中国地震局工程力学研究所,2005:17-27.
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