爆炸荷载作用下饱和土体的液化特性分析
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摘要
为了研究饱和土体在爆炸冲击荷载作用下的液化特性,在LS-DYNA软件框架内,建立了适合于爆炸荷载作用下土体动力分析的实用模型,并对某爆炸液化现场试验进行了数值模拟。模拟得到的孔压时程与试验结果基本一致,表明数值手段能够较好地预测土体在爆炸荷载作用下孔压的发展规律。同时,通过数值模拟结果还可以发现,爆炸荷载作用下土体可能发生液化的区域远大于爆炸直接冲击导致结构破坏的区域。因而,在防护结构设计中,不仅要考虑结构本身的强度是否满足抗爆设计的要求,还要考虑由于周围土体液化导致的地基失效而造成的结构失稳破坏。
To study the liquefaction behavior of the saturated soil under explosive load,the constitutive model which can well describe the dynamic property of soil was proposed in the frame of LS-DYNA in this work,meanwhile,the simulation was implemented for some blast-induced liquefaction in-situ test.The simulated pore pressure time history is consistent with that of the test,which indicates that the numerical method can well predict the pore pressure development of soil under the explosive load.In addition,the numerical results also reveal that the potential liquefaction area of soil far exceeds the region within which the structure is damaged by the direct impact of the explosion.Therefore,both the strength of the structure and the possible collapse of the structure due to the failure of its foundation induced by the liquefaction of the surrounding soils should be taken into consideration in the design of protective structure.
To study the liquefaction behavior of the saturated soil under explosive load,the constitutive model which can well describe the dynamic property of soil was proposed in the frame of LS-DYNA in this work,meanwhile,the simulation was implemented for some blast-induced liquefaction in-situ test.The simulated pore pressure time history is consistent with that of the test,which indicates that the numerical method can well predict the pore pressure development of soil under the explosive load.In addition,the numerical results also reveal that the potential liquefaction area of soil far exceeds the region within which the structure is damaged by the direct impact of the explosion.Therefore,both the strength of the structure and the possible collapse of the structure due to the failure of its foundation induced by the liquefaction of the surrounding soils should be taken into consideration in the design of protective structure.
引文
[1]赵跃堂,罗昆升,宋春明.饱和土爆炸液化问题的研究现状及其存在问题[C].成都:科学出版社,2004.
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[3]CHARLIE W A.The dial peak event[C].Proceedingsof International Workshop on Blast-induced Liquefac-tion.Organized by Maidenhead:Dames and Moore.London and U.S.Air Force Enropean Office of Scien-tific Research,1978.
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[9]WANG Zhong-qi,LU Yong,BAI Chun-hua.Numeri-cal analysis of blast-induced liquefaction of soil[J].Computers and Geotechnics,2008,35(2):196-209.
[10]WANG Lan-min,HE Kai-ming,SHI Yu-cheng,et al.Study on liquefaction of saturated loess by in-situ ex-plosion test[J].Earthquake Engineering and Engineer-aing Vibration,2002,1(1):50-56.
[11]LEWIS B A.Manual for LS-DYNA soil material model147[R].McLean VA:Federal Highway Administra-tion,2004.
[12]LEE W Y.Numerical modeling of blast-induced lique-faction[D].Provo:Brigham Young University,2006.
[13]刘红岩,王新生.地表垂直爆破震动速度的数值计算[J].爆炸与冲击,2008,28(3):265-270.LIU Hong-yan,WANG Xin-sheng.Numerical calcu-lation of ground vertical blasting vibration velocity[J].Explosion and Shock Waves,2008,28(3):265-270.(in Chinese).
[14]HALLQUIST J O.LS-DYNA keyword user's manual(971)[M].California:Livermore Software TechnologyCorporation,2007.
[15]姜涛,基于SPH法的板结土壤反旋凿切有限元仿真研究[D].杭州:浙江工业大学,2009.
[16]袁中夏,王兰民,Susumu Yasuda,等.黄土液化机理和判别标准的再研究[J].地震工程与工程振动,2004,24(4):164-169.YUAN Zhong-xia,WANG Lan-min,Susumu Yasuda,et al.Further study on mechanism and discriminationcriterion of loess liquefaction[J].Earthquake Engineer-ing and Engineering Vibration,2004,24(4):164-169.(in Chinese).
[2]VEYERA G E,CHARLIE W A.An experimental la-boratory facility for studying shock-induced liquefac-tion[J].Geotechnical Testing Journal,1990,13(4):312-323.
[3]CHARLIE W A.The dial peak event[C].Proceedingsof International Workshop on Blast-induced Liquefac-tion.Organized by Maidenhead:Dames and Moore.London and U.S.Air Force Enropean Office of Scien-tific Research,1978.
[4]ASHFORD S A,ROLLINS K M.The treasure islandliquefaction test[R].San Diego:Department of Struc-tural Engineering,School of Engineering,University ofCaliforna,2002.
[5]Al-QASIMI E M A,CHARLIE W A,WOELLER DJ.Canadian liquefaction experiment(CANLEX):blast-induced ground motion and pore pressure experi-ments[J].Geotechnical Testing Journal,2005,28(1):1-13.
[6]王明洋,赵跃堂,钱七虎,等.饱和砂土爆炸液化模型研究[J],解放军理工大学学报:自然科学版,2001,2(2):50-54.WANG Ming-yang,ZHAO Yue-tang,QIAN Qi-hu,et al.Liquefaction model for saturated sand soil underexplosive loading[J].Journal of PLA University ofScience and Technology(Natural Science),2001,2(2):50-54.(in Chinese).
[7]徐学勇.饱和钙质砂爆炸响应动力特性研究[D].武汉:中国科学院研究生院,2009.
[8]国胜兵,王明洋,钱七虎.饱和砂土爆炸液化特性研究[J].岩土力学,2007,28(3):427-435.GUO Sheng-bing,WANG Ming-yang,QIAN Qi-hu,et al.Study on characteristics of explosion liquefactionof saturated sandy soil[J].Rock and Soil Mechanics,2007,28(3):427-435.(in Chinese).
[9]WANG Zhong-qi,LU Yong,BAI Chun-hua.Numeri-cal analysis of blast-induced liquefaction of soil[J].Computers and Geotechnics,2008,35(2):196-209.
[10]WANG Lan-min,HE Kai-ming,SHI Yu-cheng,et al.Study on liquefaction of saturated loess by in-situ ex-plosion test[J].Earthquake Engineering and Engineer-aing Vibration,2002,1(1):50-56.
[11]LEWIS B A.Manual for LS-DYNA soil material model147[R].McLean VA:Federal Highway Administra-tion,2004.
[12]LEE W Y.Numerical modeling of blast-induced lique-faction[D].Provo:Brigham Young University,2006.
[13]刘红岩,王新生.地表垂直爆破震动速度的数值计算[J].爆炸与冲击,2008,28(3):265-270.LIU Hong-yan,WANG Xin-sheng.Numerical calcu-lation of ground vertical blasting vibration velocity[J].Explosion and Shock Waves,2008,28(3):265-270.(in Chinese).
[14]HALLQUIST J O.LS-DYNA keyword user's manual(971)[M].California:Livermore Software TechnologyCorporation,2007.
[15]姜涛,基于SPH法的板结土壤反旋凿切有限元仿真研究[D].杭州:浙江工业大学,2009.
[16]袁中夏,王兰民,Susumu Yasuda,等.黄土液化机理和判别标准的再研究[J].地震工程与工程振动,2004,24(4):164-169.YUAN Zhong-xia,WANG Lan-min,Susumu Yasuda,et al.Further study on mechanism and discriminationcriterion of loess liquefaction[J].Earthquake Engineer-ing and Engineering Vibration,2004,24(4):164-169.(in Chinese).
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