爆破地震的数值模拟及爆破振动规律分析
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摘要
在LS-DYNA软件框架内,建立了适合土体爆炸动力分析的实用模型,对某利用微差爆破诱发人工地震的原位试验进行了数值模拟,结果表明,计算得到的地表加速度时程与实测值比较吻合.因此,可预先利用数值手段对为爆破试验方案提供指导,对爆破地震结果进行预测.在此基础上,分析了地层中的爆破振动规律,表明自炸药的埋深向上,随着深度的减小、爆心距的增加,爆破水平向加速度幅值和速度幅值逐渐减小,而竖直向加速度幅值和速度幅值则呈现先增大,后减小,到了近地表自由面又基本维持稳定的趋势.数值结果丰富了爆破地震的研究,为微差爆破模拟天然地震、并以此来研究土体地震动力响应提供了经济、简便而实用的方法.
In the frame of LS-DYNA,the constitutive model which can well describe the dynamic property of soil under blast loading was proposed,meanwhile,certain blast-induced earthquake in-situ test was simulated,with the calculated acceleration time histories approximate to the recorded data,which indicates the numerical method can provide useful instructions for the in-situ blasting tests in advance and well predicts the blasting results;based on it,the blasting vibration law through the stratums was analyzed,which reveals that up from the plane where explosive charges lay,the amplitude of horizontal acceleration and velocity minish continuously with the decrease of the burial depth(or the increase of blast center distance),while the amplitude of vertical acceleration and velocity increase first,then decrease and at last remain relatively stable when approaching the free surface on the ground surface.The numerical endeavour enriches the research on the blast-induced ground motion and supplies a simple,effective and economic method for the simulation of natural earthquake by millisecond blasting test as well as for the study of seismic response of soil based on it.
In the frame of LS-DYNA,the constitutive model which can well describe the dynamic property of soil under blast loading was proposed,meanwhile,certain blast-induced earthquake in-situ test was simulated,with the calculated acceleration time histories approximate to the recorded data,which indicates the numerical method can provide useful instructions for the in-situ blasting tests in advance and well predicts the blasting results;based on it,the blasting vibration law through the stratums was analyzed,which reveals that up from the plane where explosive charges lay,the amplitude of horizontal acceleration and velocity minish continuously with the decrease of the burial depth(or the increase of blast center distance),while the amplitude of vertical acceleration and velocity increase first,then decrease and at last remain relatively stable when approaching the free surface on the ground surface.The numerical endeavour enriches the research on the blast-induced ground motion and supplies a simple,effective and economic method for the simulation of natural earthquake by millisecond blasting test as well as for the study of seismic response of soil based on it.
引文
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[3]汪明武,Susumu IAI,TestuoTOBITA.液化场地堤坝地震响应动态土工离心试验及模拟[J].水利学报,2008,39(12):1346-1352.
[4]黄春霞,张鸿儒.大型叠层剪切变形模型箱的研制[J].岩石力学与工程学报,2006,25(10):2128-2134.
[5]李敏霞,杨泽群,陈建秋.地震模拟振动台技术的开发与应用[J].世界地震工程,1996,2(1):49-54.
[6]王兰民,孙军杰,徐舜华,等.爆破模拟地震动条件下黄土场地震陷研究[J].岩石力学与工程学报,2008,27(5):913-921.
[7]Lee,WAYNE Y.NUMERICAL MODELING OFBLAST-INDUCED LIQUEFACTION[D].BrighamYoung University,PhD Thesis.August 2006.
[8]PATHIRAGE K S.Critical assessment of theCANLEX blast experiment to facilitate a develop-ment of an in-situ liquefaction methodology usingexplosives[D].Department of Civil Engineering,Degree of Master of Science,2000.
[9]ASHFORD S A,ROLLINS K M.Blast-InducedLiquefaction for Full-Scale Foundation Testing[J].Journal of Geotechnical and Geoenvironmental Engi-neering.2004,130(8):798-806.
[10]孙军杰.黄土场地震陷与桩基负摩阻力现场试验研究[D].兰州:兰州大学土木工程与力学学院博士学位论文,2010.
[11]Lewis B A.Manual for LS-DYNA Soil Material Model147[R].Federal Highway Administration,2004.
[12]徐芝纶.弹性力学[M].北京:人民教育出版社,1983.
[13]Anon.Ls-dyna key word users’menual(Version971/Release 4)[M].s.l.Livermore SoftwareTechnology Corporation,2009.
[14]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):255-270.
[15]亨利奇.爆炸动力学及其应用[M].熊建国,译.北京:科学出版社,1987.
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