人工激振下现场液化试验初步研究
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摘要
文中采用人工激振,设计完成了简单工况下现场液化试验,并与干砂试验结果对比得到了孔压增长与土体表层加速度、剪应变的关系。试验结果表明:当孔压比为0.5时,液化开始显著影响土表加速度;当孔压比为0.6左右,液化土体剪应变幅值最大,而并非孔压比为1时幅值最大。以上结论同现有的室内振动台试验一致,说明了本试验是成功的。
The in-situ liquefaction tests are designed and accomplished under artificial dynamic loading.Taking dry sand as a base,the relationships between pore water pressure and acceleration,soil shear strain are obtained.The tested results indicate that soil liquefaction greatly reduces surface acceleration amplitude when the pore water pressure ratio increases to 0.5.Shear strain amplitude of liquefied soil reaches the maximum when the pore water pressure ratio is about 0.6 rather than 1.0.These results are consistent with shaking table testing results,which demonstrates the test is successful.
The in-situ liquefaction tests are designed and accomplished under artificial dynamic loading.Taking dry sand as a base,the relationships between pore water pressure and acceleration,soil shear strain are obtained.The tested results indicate that soil liquefaction greatly reduces surface acceleration amplitude when the pore water pressure ratio increases to 0.5.Shear strain amplitude of liquefied soil reaches the maximum when the pore water pressure ratio is about 0.6 rather than 1.0.These results are consistent with shaking table testing results,which demonstrates the test is successful.
引文
[1]孙锐,袁晓铭.第十一届国际土动力学和地震工程会议及第13届世界地震工程会议砂土液化研究综述[J].世界地震工程,2006,22(1):15-21.
[2]Ishihara K.Soil Behavior in Earthquake Geotechnics[M].Oxford:Clarendon Press,1996.
[3]Chang W J.Development of an In-Situ Dynamic Liquefaction Test[D].Austin:The University of Texas at Austin,2002.
[4]Steven L K.Geotechnical Earthquake Engineering[M].New York:Prentice-Hall,Inc.,1996.
[5]Ishihara K,Shinizu K,Yamada Y.Pore water pressures measured in sand deposits during an earthquake[J].Soils and Foundations,1981,21(4):85-100.
[6]Ishihara K,Muroi T,Towhata I.In-situ pore water pressures and ground motions during the 1987 Chiba-Toho-Oki Earthquake[J].Soils andFoundations,1989,29(4):75-90.
[7]Holzer TL,Hanks TC,Youd TL.Dynamics of liquefaction during the 1987 Superstition Hills,California,Earthquake[J].Science,1989,244(4900):56-59.
[8]Wang Lanmin,He Kaiming,Shi Yucheng and Wang Jun.Study on liquefaction of saturated loess by in situ explosion test[J].Earthquake Engi-neering and Engineering Vibration,2002,1(1):50-56.
[9]常方强,贾永刚,郭秀军,等.黄河口粉土液化过程的现场振动试验研究[J].岩土工程学报,2009,31(4):609-616.
[10]刘习军,贾启芬.工程振动理论与测试技术[M].北京:高等教育出版社,2004.
[11]Dunnicliff J.Geotechnical Instrumentation for Monitoring Field Performance[M].New York:John Wiley&Sons,Inc.,1988.
[12]孙锐,袁晓铭,李雨润,等.循环荷载下液化对土层水平往返变形的影响[J].西北地震学报,2009,31(1):8-14.
[2]Ishihara K.Soil Behavior in Earthquake Geotechnics[M].Oxford:Clarendon Press,1996.
[3]Chang W J.Development of an In-Situ Dynamic Liquefaction Test[D].Austin:The University of Texas at Austin,2002.
[4]Steven L K.Geotechnical Earthquake Engineering[M].New York:Prentice-Hall,Inc.,1996.
[5]Ishihara K,Shinizu K,Yamada Y.Pore water pressures measured in sand deposits during an earthquake[J].Soils and Foundations,1981,21(4):85-100.
[6]Ishihara K,Muroi T,Towhata I.In-situ pore water pressures and ground motions during the 1987 Chiba-Toho-Oki Earthquake[J].Soils andFoundations,1989,29(4):75-90.
[7]Holzer TL,Hanks TC,Youd TL.Dynamics of liquefaction during the 1987 Superstition Hills,California,Earthquake[J].Science,1989,244(4900):56-59.
[8]Wang Lanmin,He Kaiming,Shi Yucheng and Wang Jun.Study on liquefaction of saturated loess by in situ explosion test[J].Earthquake Engi-neering and Engineering Vibration,2002,1(1):50-56.
[9]常方强,贾永刚,郭秀军,等.黄河口粉土液化过程的现场振动试验研究[J].岩土工程学报,2009,31(4):609-616.
[10]刘习军,贾启芬.工程振动理论与测试技术[M].北京:高等教育出版社,2004.
[11]Dunnicliff J.Geotechnical Instrumentation for Monitoring Field Performance[M].New York:John Wiley&Sons,Inc.,1988.
[12]孙锐,袁晓铭,李雨润,等.循环荷载下液化对土层水平往返变形的影响[J].西北地震学报,2009,31(1):8-14.
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