Experimentalstudyonseismiccouplingeffectsofundergroundexplosions indifferentmaterial
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摘要: 对黄土、砂砾石和花岗岩等几种不同介质中的地下爆炸实验进行了地表速度测量,利用实测数据 获得爆炸源频谱以及以折合速度势低频稳态值表示的地震耦合强度。实验结果表明,对于相同当量、相当比 例埋深下的地下爆炸,地震耦合强度和源区介质特性有着强烈的依赖关系,其中介质强度是影响地震耦合效 率的最主要因素,而介质的干孔隙率和水饱和度也是影响地震耦合效率的重要因素。考察了M.D.Denny等 提出的经验公式在估算100kg级当量地下爆炸地震耦合强度的适用性和局限性。Abstract: Abstract:Undergroundexplosionexperimentswiththeexplosionequivalentof100kgTNTwereperformedindifferentgeologicalmediums, suchasloess,sand-gravelcompositeandgranite.Andthe correspondingsurfacegroundmotionsinducedbyundergroundexplosionswereobservedbyaseriesof seismometers.Byusingtheseobserveddata,thesourceparameterswereobtained,aswellasthe seismiccouplingefficiencyrepresentedbythesteadyvalueofreducedvelocitypotentialatlowfrequencies. Experimentalresultsdisplaythatfortheundergroundexplosionswiththesamescaleddepth ofburialandsameexplosionequivalent,theseismiccouplingefficiencywasstronglydependantonthe sourcemediumpropertyinsuchawaythatthemediumstrengthplaysthemostsignificantrolesindeterminingtheseismiccouplingeffectandthenthe orosityandthewatersaturation.Andbasedonthe experimentaldata,thefeasibilityoftheempiricalformulaproposedbyM.D.Denny,etalwasanalyzedinestimatingtheseismiccouplingeffectofundergroundexplosionswiththeexplosionequivalent of100kgTNT.
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