Stress-straincurveandstresswavecharacteristicsof rocksubjectedtocyclicimpactloading
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摘要: 利用研制的岩石动静组合加载实验装置进行循环冲击实验,研究了在循环冲击过程中岩石典型的 动态应力应变曲线及反射波和透射波的变化规律。结果表明:岩石在循环冲击过程中的动态应力应变曲线可 分为压密阶段、弹性阶段、内部裂纹扩展的加载阶段、第1卸载阶段和第2卸载阶段等5个阶段。在相同入射 波循环作用下,随着循环次数的增加,岩石的反射波峰值越来越大,反射波峰值出现的时间越来越迟,透射波 峰值越来越小,透射波峰值出现的时间越来越早,表明在循环冲击过程中岩石内部损伤逐渐累积,从而导致抵 抗外部冲击载荷的能力逐渐降低。Abstract: Aninnovativetestingtechniquecoupledbystaticanddynamicloadswasintroducedtoinvestigatethetypicaldynamicstress- straincurveoftherockspecimenundercyclicimpactloadingsaswell asthechangesofthereflectedandtransmittedwavespropagatinginit.Theresultsshowthatthesingletypicalstress- straincurveoftherockspecimenundercyclicimpactscanbedividedintofivestages: thecompactedstage,theelasticstage,theloadingstageoftheinternalcrackpropagation,thefirst unloadingstageandthesecondunloadingstage.Withtheincreaseinthenumberofimpact,theamplitudeofthereflectedwaveincreasesandthecorrespondingpeakvalueappearslater; theamplitude ofthetransmittedwavedecreasesandthecorrespondingpeakvalueoccurincreasinglyearlier,respectively. Itisdemonstratedthatthecyclicimpactsontherockspecimenareaccompaniedbythedamage accumulationresultinginthereducingofitsabilitytoresisttheexternalimpactloads.
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