摘要:
针对目前土体爆炸压密理论研究不够深入、施工中主要依靠工程经验确定爆炸参数的现状,建立
了基于塑性力学和爆炸力学的土体爆炸压密模型,推得压密效果(压密范围、压密程度)与爆炸参数之间的关
系式,并通过室外试验进行验证。在孔径为48mm 的炮孔中进行了不耦合系数分别为2.000、1.714、1.500、
1.333、1.200、1.091和1.000的7组室外试验,通过测量爆炸前后的土体密度,进行理论和试验结果的对比
分析。研究表明,不耦合装药时,压密效果的理论值随不耦合系数呈递增变化,而试验值呈先增后减的趋势,
且在不耦合系数为约1.200时出现最大值;对于粘质粉土,压密效果较稳定,最大压密范围达到70cm,最大
压缩比为1.055;给出的爆炸后土体压密计算公式的准确性较高,相对误差小于6.00%,可用于工程实际。
关键词:
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爆炸力学 /
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压密原理 /
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爆炸 /
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土体密度
Abstract:
Aimedatthestatusofexplosioncompaction,whichwasnotthoroughintheorystudyand
reliedmainlyonengineeringexperiencetodetermineblastparametersinconstructions,asoilexplosioncompactionmodelwasdevelopedwhichwasbasedonplasticmechanicsandmechanicsofexplosion.
Therelationsbetweencompactioneffects(compactionrange,compactiondegree)andexplosive
parameterswerederivedandverifiedbythefieldtests.Thesevenfieldtestswerecarriedoutinthe
holeswiththediameterof48mmandthecorrespondingnon-couplingcoefficientswere2.000,1.714,
1.500,1.333,1.200,1.091and1.000,respectively.Andtheoreticalcalculationsandfieldtestresultswerecomparedbymeasuringthesoildensitybeforeandaftertheexplosion.
Investigatedresults
indicatethatinthecaseofnon-couplingcharge,thetheoreticalvalueofcompactioneffectincreases
withtheincreaseofnon-couplingcoefficient,whiletheexperimentaldatafirstincreasesandthendecreases,
arrivingatthemaximumforthenon-couplingcoefficientofaround1.200.Fortheclayey
silt,thecompactioneffectwasmorestable,thelargestcompactionrangeattains70cmandthemaximumcompressionratiois1.055.
Thedevelopedsoilcompactionformulasafterexplosionaremoreaccurateandtherelativeerrorislessthan6.00%,
sothattheseformulascanbeappliedtoengineering
practice
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