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利用SHPB试验系统,结合高速摄影技术,研究了冬瓜山铜矿深部采集的两种不同大理岩在动态劈裂下的应变率和强度、破坏应变之间的关系。实验数据表明,应变率对试样抗拉强度的影响较为显著,两种大理岩的动态抗拉强度随着应变率的增加而增大;灰色大理岩当应变率小于50s-1时,随着应变率的增加,动态拉伸强度敏感系数变化较大,当应变率大于50s-1时,动态拉伸强度敏感系数则变化不大,而白色大理岩则是在应变率大于120s-1后;随着应变率的增加,试样的破坏应变也随之增加。
Using SHPB test system and high-speed photography technology, the relationship between strain rate and strain rate of two different marble collected in deep Dongguashan copper mine was studied. Experimental data show that the strain rate of the tensile strength of the sample is more significant, the dynamic tensile strength of two marble with the strain rate increases; gray marble when the strain rate is less than 50s-1, with the When the strain rate is greater than 50s-1, the sensitivity coefficient of dynamic tensile strength does not change much, while the white marble is after the strain rate is greater than 120s-1; With the increase of strain rate, the strain of specimen also increases.