饱和南京细砂永久应变势模型的试验研究
|
摘要
土单元永久应变势的预测模型是土动力学的重要研究内容之一。现有的土单元永久应变势模型没有反映振动孔压增长的影响,难以合理解释地震动作用引起的饱和砂土地基永久变形一般是由土层软化或再固结变形所致的机理。基于饱和南京细砂永久变形动三轴试验结果的有效应力状态分析,研究了试样的永久变形与振动孔压增长的关系,建立了一个能反映振动孔压增长影响的土单元永久应变势模型,给出了土单元永久应变势的数学表达式,分析了土单元永久应变势模型参数的影响因素。初步的验证性试验表明:模型预测与试验测得的试样永久应变势与振动孔压增长曲线比较接近,说明该模型具有一定的合理性。
The research on the model of the permanent strain potential of soil element is an important task of soil dynamics.The previous models on this issue have not considered the influence of the pore water pressure growth in sand soils on the permanent strain potential of soil element,which are difficult to explain the mechanism of the earthquake-induced settlement of foundation mainly caused by soften or re-consolidation deformation of saturated sand soil foundation reasonably.Based on the effective stress state analysis of the results of dynamic triaxial tests on saturated Nanjing fine sand,the relationship between the pore water pressure growth and the permanent strain potential of the sample is studied.A model of the permanent strain potential is established,which can reflect the effect of pore water pressure growth,further more,a formula of the model is proposed,and the effects of the parameters of the model are also analyzed.The results of preliminary verification show that the curves of pore water pressure and permanent strain potential growth with the predicted model are approaching to that of test results.So this indicates that the model of the permanent strain potential is rational.
The research on the model of the permanent strain potential of soil element is an important task of soil dynamics.The previous models on this issue have not considered the influence of the pore water pressure growth in sand soils on the permanent strain potential of soil element,which are difficult to explain the mechanism of the earthquake-induced settlement of foundation mainly caused by soften or re-consolidation deformation of saturated sand soil foundation reasonably.Based on the effective stress state analysis of the results of dynamic triaxial tests on saturated Nanjing fine sand,the relationship between the pore water pressure growth and the permanent strain potential of the sample is studied.A model of the permanent strain potential is established,which can reflect the effect of pore water pressure growth,further more,a formula of the model is proposed,and the effects of the parameters of the model are also analyzed.The results of preliminary verification show that the curves of pore water pressure and permanent strain potential growth with the predicted model are approaching to that of test results.So this indicates that the model of the permanent strain potential is rational.
引文
[1]谢君斐,石兆吉,郁寿松,等.液化危害性分析[J].地震工程与工程振动,1988,8(1):61-77.XIE Junfei,SHI Zhaoji,YUShousong,et al.Hazard analysis of liquefaction[J].Journal of Earthquake Engineering and Engineering Vibration,1988,8(1):61-77.
[2]陈国兴.岩土地震工程学[M].科学出版社,2007.CHEN Guoxing.Geotechnical earthquake engineering[M].Science Press,2007.
[3]Dashti S,Bray J D,Pestana J M,et al.Mechanisms of seismically induced settlement of buildings with shallowfoundations on liquefiable soil[J].Journal of Geotechnical and Geoenvironmental Engineering,2010,136(1):151-164.
[4]Kutter B L,Gajan S,Manda KK,et al.Effects of layer thickness and density of settlement and lateral spreading[J].Journal of Geotechnical andGeoenvironmental Engineering,2004,130(6):603-614.
[5]Lee K L,Albaisa A.Earthquake induced Settlements in saturated sands[J].American Society of Civil Engineers,Journal of the Geotechnical En-gineering Division,1974,100(GT4):387-406.
[6]Ueng TS,Wu C W,Cheng HW,et al.Settlements of saturated clean sand deposits in shaking table tests[J].Soil Dynamics and Earthquake En-gineering,2010,30(1-2):50-60.
[7]郁寿松,石兆吉,谢君斐,等.上海地铁隧道振陷的计算分析[J].地震工程与工程振动,1986,(01):51-60.YUShousong,SHI Zhaoji,XIE Junfei,et al.Analysis of permanent deformation for tunnel of shanghai underground[J].Journal of Earthquake En-gineering and Engineering Vibration,1986,6(1):51-60.
[8]郁寿松,石兆吉.土壤震陷试验研究[J].岩土工程学报,1989,11(4):35-44.YUShousong,SHI Zhaoji.Experimental investigation of soil settlement due to earthquake[J].Chinese Journal of Geotechnical Engineering,1989,11(4):35-44.
[9]石兆吉,郁寿松,翁鹿年.塘沽新港地区震陷计算分析[J].土木工程学报,1988,21(4):24-34.SHI Zhaoji,YUShousong,WENG Lunian.Seismic settlement evaluation for Tanggu newport area[J].China Civil Engineering Journal,1988,21(4):24-34.
[10]张克绪,李明宰.地震引起的土坝永久变形分析[J].地震工程与工程振动,1989,9(1):91-100.ZHANG Kexu,LI Mingzai.Analysis of earthquake induced permanent deformations for earth dams[J].Journal of Earthuake Engineering and En-gineering Vibration,1989,9(1):91-100.
[11]CHEN Guoxing,ZHUDinghua,SHI Junjan.Experimention on earthquake-induced permanent deformation of nanjing recently deposited muddysoil[C]//Proceedings of the 2nd International Conference on Geotechnical Engineering for Disaster Mitigation&Rehabilitation(GEDMAR08):Nanjing,China,2008:301-308.
[12]周镜.岩土工程中的几个问题[J].岩土工程学报,1999,21(01):2-8.ZHIOUJing.Some cases in geotechnical engineering[J].Chinese Journal of Geotechnical Engineering,1999,21(1):2-8.
[13]张克绪.饱和砂土的液化应力条件[J].地震工程与工程振动,1984,4(1):99-109.ZHANG Kexu.Stress condition inducing liquefaction of saturated sand[J].Journal of Earthquake Engineering and Engineering Vibration,1984,4(1):99-109.
[14]王炳辉,陈国兴,李方明.饱和南京细砂孔压增量模型的普适性研究[J].防灾减灾工程学报,2010,30(5):487-496.WANG Binghui,CHENGuoxing,LI Fangming.Extending research of the pore water pressure on saturated Nanjing fine sand[J].Journal of Dis-aster Prevention and Mitigation Engineering,2010,30(5):487-496.
[15]王炳辉,陈国兴.循环荷载下饱和南京细砂的孔压增量模型[J].岩土工程学报,2011,33(2):188-194.WANG Binghui,CHENGuoxing.Apore water pressure increment model for saturated nanjing fine sand subjected to cyclic loading[J].ChineseJournal of Geotechnical Engineering,2011,33(2):188-194.
[2]陈国兴.岩土地震工程学[M].科学出版社,2007.CHEN Guoxing.Geotechnical earthquake engineering[M].Science Press,2007.
[3]Dashti S,Bray J D,Pestana J M,et al.Mechanisms of seismically induced settlement of buildings with shallowfoundations on liquefiable soil[J].Journal of Geotechnical and Geoenvironmental Engineering,2010,136(1):151-164.
[4]Kutter B L,Gajan S,Manda KK,et al.Effects of layer thickness and density of settlement and lateral spreading[J].Journal of Geotechnical andGeoenvironmental Engineering,2004,130(6):603-614.
[5]Lee K L,Albaisa A.Earthquake induced Settlements in saturated sands[J].American Society of Civil Engineers,Journal of the Geotechnical En-gineering Division,1974,100(GT4):387-406.
[6]Ueng TS,Wu C W,Cheng HW,et al.Settlements of saturated clean sand deposits in shaking table tests[J].Soil Dynamics and Earthquake En-gineering,2010,30(1-2):50-60.
[7]郁寿松,石兆吉,谢君斐,等.上海地铁隧道振陷的计算分析[J].地震工程与工程振动,1986,(01):51-60.YUShousong,SHI Zhaoji,XIE Junfei,et al.Analysis of permanent deformation for tunnel of shanghai underground[J].Journal of Earthquake En-gineering and Engineering Vibration,1986,6(1):51-60.
[8]郁寿松,石兆吉.土壤震陷试验研究[J].岩土工程学报,1989,11(4):35-44.YUShousong,SHI Zhaoji.Experimental investigation of soil settlement due to earthquake[J].Chinese Journal of Geotechnical Engineering,1989,11(4):35-44.
[9]石兆吉,郁寿松,翁鹿年.塘沽新港地区震陷计算分析[J].土木工程学报,1988,21(4):24-34.SHI Zhaoji,YUShousong,WENG Lunian.Seismic settlement evaluation for Tanggu newport area[J].China Civil Engineering Journal,1988,21(4):24-34.
[10]张克绪,李明宰.地震引起的土坝永久变形分析[J].地震工程与工程振动,1989,9(1):91-100.ZHANG Kexu,LI Mingzai.Analysis of earthquake induced permanent deformations for earth dams[J].Journal of Earthuake Engineering and En-gineering Vibration,1989,9(1):91-100.
[11]CHEN Guoxing,ZHUDinghua,SHI Junjan.Experimention on earthquake-induced permanent deformation of nanjing recently deposited muddysoil[C]//Proceedings of the 2nd International Conference on Geotechnical Engineering for Disaster Mitigation&Rehabilitation(GEDMAR08):Nanjing,China,2008:301-308.
[12]周镜.岩土工程中的几个问题[J].岩土工程学报,1999,21(01):2-8.ZHIOUJing.Some cases in geotechnical engineering[J].Chinese Journal of Geotechnical Engineering,1999,21(1):2-8.
[13]张克绪.饱和砂土的液化应力条件[J].地震工程与工程振动,1984,4(1):99-109.ZHANG Kexu.Stress condition inducing liquefaction of saturated sand[J].Journal of Earthquake Engineering and Engineering Vibration,1984,4(1):99-109.
[14]王炳辉,陈国兴,李方明.饱和南京细砂孔压增量模型的普适性研究[J].防灾减灾工程学报,2010,30(5):487-496.WANG Binghui,CHENGuoxing,LI Fangming.Extending research of the pore water pressure on saturated Nanjing fine sand[J].Journal of Dis-aster Prevention and Mitigation Engineering,2010,30(5):487-496.
[15]王炳辉,陈国兴.循环荷载下饱和南京细砂的孔压增量模型[J].岩土工程学报,2011,33(2):188-194.WANG Binghui,CHENGuoxing.Apore water pressure increment model for saturated nanjing fine sand subjected to cyclic loading[J].ChineseJournal of Geotechnical Engineering,2011,33(2):188-194.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心