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摘要: 采用落锤动态加载岩石实验系统,通过调节落锤质量、下落距离及活塞杆垫板材料,记录岩石瞬间 形成冲击压力脉冲,研究压胀对不同岩石性质影响的规律。实验结果表明,压胀产生后岩石的性质发生了改 变,岩石的渗透率有不同程度的增加,且岩石越致密,渗透率增加倍数越大;岩石的弹性模量和弹性极限随岩 石体积的增加而降低;压胀产生后纵波和横波在岩石中的传播速度减小,岩样内部产生了微裂纹或原有微裂 纹延伸扩展造成孔隙度增加。Abstract: Drop-hammerloadexperimentswereperformedondifferentrocksamples.Bychangingthe drophammerweight,dropheightandpistonrodspacermaterial,transientshockpressurepulsesin therocksampleswererecordedbythepressuregauges.Experimentalresultsindicatethatthepropertiesoftherocksundergothefollowingchangesinducedbydilatancy:( 1)thepermeabilityoftherocks increasesinvaryingdegrees,andthedensertherockis,thegreatertheincreasemultipleofthepermeabilityis;( 2)theelasticmodulusandelasticlimitdecreasewiththeincreaseofrockvolume;(3) thepropagationvelocitiesoflongitudinalandtransversewavesdecreaseintherocks;(4)theporosities intherocksincreaseduetotheextensionofthenew-producedorinherentmicro-cracksintherocks.
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Key words:
- solidmechanics /
- dilatancy /
- impactload /
- rock /
- permeability
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