【摘要】 本文提出了分析研究岩石杆中应力波衰减机制(初始微裂纹、节理、剪胀等因素的影响)的一种方法,并相应提出了减少波形振荡,提高试验精度的措施。利用这种方法,对这些因素引起应力波衰减的特点进行了初步探讨。此外还提出了在波传播时幅值无衰减的情况下,从一根杆试验中测得的应变波形,求得包括卸载在内的完整的动态滞迴应力应变关系的方法,这个方法比SHPB法更方便。实验结果说明,完整致密的石灰岩只有在剪张点以下方可当作弹性材料处理。更多还原

【Abstract】 This article proposes a testing method by which different attenuation mechanisms of the stress wave propagation in a rock bar can be investigated separately. At the same time, methods to suppres local oscillations superposed on the strain profile and improve the experiment are also recommended. By using this method various characteristics of propagation and attenuation of the stress waves in a rock bar have been examined preliminarily. From informations about wave propagation a complete dynamic hysterestic stress-strain curve, may be constracted. Therefore this leads to a more convenient way for constructing the stress strain curve than the SHPB method. The results in this study also suggest that it is reasonable to treat a hard, fine-grained limestone bar as an elastic one provided the stresses are such that dilatancy has not occurred.更多还原