液化场浅埋地下结构动力特性数值分析
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摘要
应用FLAC3D作自由场典型液化数值模拟试验、刚性结构对液化场影响试验、液化场浅埋地下结构动力特性试验、弹性场浅埋地下结构动力特征比对试验。试验结果再一次揭示了砂土液化典型特性:体积压缩积累增大,有效应力降低,超静孔隙水压升高。试验证实了液化的隔振作用:砂土在液化状态不能传递剪力,其加速度、速度、位移振幅显著衰减。试验得出:刚性结构有抑制周围土液化的作用。计算结果表明,液化场中浅埋地下结构的加速度反应比弹性场要小,但液化场中结构的应力应变却比弹性场大。在场地基底水平振动荷载作用下,弹性场浅埋地下结构的受力变形特点以剪切型变形为主,液化场浅埋地下结构受力变形特点以对称弯曲型变形为主。
The numerical simulation test was completed for the typical liquefaction in free field with FLAC3D,a test on impact of rigid structure on LP field,the test on dynamic characteristics of liquefaction field and shallow underground structures interaction and the dynamic characteristics test for shallow underground structures in elastic field were completed.The results show that the typical characteristics of soil liquefaction are the increase of accumulation of volumetric compression,reduction of effective stress and increase of excess pore water pressure.The results confirmed the isolation effect of liquefaction: the sandy soil in liquid state could not transfer the shear force and its acceleration,velocity and displacement amplitude decreased significantly.Experiment showed that the rigid structure inhibited liquefaction of surrounding soil.The calculation results show that the acceleration response of underground structures in liquefaction field is smaller than that in the elastic fields,but the stress and strain of structure in liquefaction field is larger.With vibrating load on the field bottom base,the deformation feature of shallow underground structure in elastic fields is of shear type,the deformation feature of shallow underground structure in PL fields is of bending type.
The numerical simulation test was completed for the typical liquefaction in free field with FLAC3D,a test on impact of rigid structure on LP field,the test on dynamic characteristics of liquefaction field and shallow underground structures interaction and the dynamic characteristics test for shallow underground structures in elastic field were completed.The results show that the typical characteristics of soil liquefaction are the increase of accumulation of volumetric compression,reduction of effective stress and increase of excess pore water pressure.The results confirmed the isolation effect of liquefaction: the sandy soil in liquid state could not transfer the shear force and its acceleration,velocity and displacement amplitude decreased significantly.Experiment showed that the rigid structure inhibited liquefaction of surrounding soil.The calculation results show that the acceleration response of underground structures in liquefaction field is smaller than that in the elastic fields,but the stress and strain of structure in liquefaction field is larger.With vibrating load on the field bottom base,the deformation feature of shallow underground structure in elastic fields is of shear type,the deformation feature of shallow underground structure in PL fields is of bending type.
引文
[1]陈国兴.岩土地震工程学[M].北京:科学出版社,2007.(Chen Xingguo.Geotechnical earthquake engi-neering[M].Beijing:Science Press,2007.(in Chi-nese))
[2]Geoffrey R Martin,W.D.Liam Finn,H.Bolton Seed.Fundamentals of liquefaction under cyclic loading[J].Journal of the Geotechnical Engineering Division,May1975,423-438.
[3]Peter M.Byrne.A cyclic shear-volume coupling andpore pressure model for sand[A]//Second InternationalConference on Recent Advances in Geotechnical Earth-quake Engineering and Soil Dynamics[C].March 11-15,1991,St.Louis,Missouri,Paper No.1.24,47-55.
[4]何剑平,陈卫忠.地下结构碎石排水层抗液化措施数值试验[J].岩土力学,2011,32(10):3177-3 184.(He Jianping,Chen Weizhong.The numericalexperimentation of anti-liquefaction measure with gravelstone drainage layer around underground structure[J].Rock and Soil Mechanics.2011,32(10):3 177-3 184.(in Chinese))
[5]郑永来,杨德林,李文艺,等.地下结构抗震[M].上海:同济大学出版社,2007.(Zheng Yonglai,YangDelin,Li Wenyi,et al.Underground structure earth-quake resistance[M].Shanghai:Tongji UniversityPress,2007:.(in Chinese))
[6]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009.(ChenYumin,Xu Dinping.FLAC/FLAC3D Foundation andproject example[M].Beijing:China Hydraulic Press,2009.(in Chinese))
[7]何剑平,陈卫忠.自由场典型液化特征数值模拟试验[J].地震工程与工程振动,2011,31(2):162-169.(He Jianping,Chen Weizhong.The numericalsimulation experiment of typical liquefaction characteris-tics for free field[J].Journal of Earthquake Engineeringand Engineering Vibration,2011,31(2):162-169.(in Chinese))
[8]孙锐,袁晓铭.地震荷载下饱和砂土孔压增长时程计算方法[J].地震工程与工程振动,2005,26(3):261-263.(Sun Rui,Yuan Xiaomin.A method for cal-culating time-dependent pore water pressure rise of satu-rated sands under earthquake loading[J].EarthquakeEngineering and Engineering Vibration,2005,26(3):261-263.(in Chinese))
[9]刘光磊,宋二祥,刘华北.可液化地层中地铁隧道地震响应数值模拟及其试验验证[J].岩土工程学报,2007,29(12):1 815-1 822.(Liu Guanglei,SongErxiang.Numerical modeling of subway tunnels in liq-uefiable soil under earthquakes and verification by cen-trifuge tests[J].Chinese Journal of Geotechnical Engi-neering,2007,29(12):1 815-1 822.(in Chinese))
[10]何剑平,陈卫忠.碎石排水层地下结构非自由场液化数值试验分析[J].山东大学学报(工学版),2011,41(3):93-100.(He Jianping,Chen Weizhong.The numerical experiments and analysis for liquefactionin non free field with gravel stone drainage layer aroundunderground structure[J].Journal of Shandong Univer-sity(Engineering Science),2011,41(3):93-100.(in Chinese))
[2]Geoffrey R Martin,W.D.Liam Finn,H.Bolton Seed.Fundamentals of liquefaction under cyclic loading[J].Journal of the Geotechnical Engineering Division,May1975,423-438.
[3]Peter M.Byrne.A cyclic shear-volume coupling andpore pressure model for sand[A]//Second InternationalConference on Recent Advances in Geotechnical Earth-quake Engineering and Soil Dynamics[C].March 11-15,1991,St.Louis,Missouri,Paper No.1.24,47-55.
[4]何剑平,陈卫忠.地下结构碎石排水层抗液化措施数值试验[J].岩土力学,2011,32(10):3177-3 184.(He Jianping,Chen Weizhong.The numericalexperimentation of anti-liquefaction measure with gravelstone drainage layer around underground structure[J].Rock and Soil Mechanics.2011,32(10):3 177-3 184.(in Chinese))
[5]郑永来,杨德林,李文艺,等.地下结构抗震[M].上海:同济大学出版社,2007.(Zheng Yonglai,YangDelin,Li Wenyi,et al.Underground structure earth-quake resistance[M].Shanghai:Tongji UniversityPress,2007:.(in Chinese))
[6]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009.(ChenYumin,Xu Dinping.FLAC/FLAC3D Foundation andproject example[M].Beijing:China Hydraulic Press,2009.(in Chinese))
[7]何剑平,陈卫忠.自由场典型液化特征数值模拟试验[J].地震工程与工程振动,2011,31(2):162-169.(He Jianping,Chen Weizhong.The numericalsimulation experiment of typical liquefaction characteris-tics for free field[J].Journal of Earthquake Engineeringand Engineering Vibration,2011,31(2):162-169.(in Chinese))
[8]孙锐,袁晓铭.地震荷载下饱和砂土孔压增长时程计算方法[J].地震工程与工程振动,2005,26(3):261-263.(Sun Rui,Yuan Xiaomin.A method for cal-culating time-dependent pore water pressure rise of satu-rated sands under earthquake loading[J].EarthquakeEngineering and Engineering Vibration,2005,26(3):261-263.(in Chinese))
[9]刘光磊,宋二祥,刘华北.可液化地层中地铁隧道地震响应数值模拟及其试验验证[J].岩土工程学报,2007,29(12):1 815-1 822.(Liu Guanglei,SongErxiang.Numerical modeling of subway tunnels in liq-uefiable soil under earthquakes and verification by cen-trifuge tests[J].Chinese Journal of Geotechnical Engi-neering,2007,29(12):1 815-1 822.(in Chinese))
[10]何剑平,陈卫忠.碎石排水层地下结构非自由场液化数值试验分析[J].山东大学学报(工学版),2011,41(3):93-100.(He Jianping,Chen Weizhong.The numerical experiments and analysis for liquefactionin non free field with gravel stone drainage layer aroundunderground structure[J].Journal of Shandong Univer-sity(Engineering Science),2011,41(3):93-100.(in Chinese))
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