岩石类脆性材料冲击性能研究-岩石力学与工程学报.PDFVIP

第 26 卷 增 1 岩石力学与工程学报 Vol.26 Supp.1 2007 年 7 月 Chinese Journal of Rock Mechanics and Engineering July ，2007 岩石类脆性材料冲击性能研究 费辉阳，徐松林，唐志平 ( 中国科学技术大学 中国科学院材料力学行为和设计重点实验室，安徽 合肥 230027) 摘要：基于剪切波跟踪技术(SWT)，对岩盐、水泥砂浆石复合材料进行压剪联合冲击试验，通过冲击剪切性能来 揭示脆性材料的损伤状态。 在冲击损伤阶段，脆性材料的冲击压缩性能规律不明显，但剪切方面表现出随损伤程 度加深，剪切波波速和剪切强度明显降低的规律。比较有法向应力和无法向应力作用时的剪切强度，当无法向应 力作用时，材料损伤后剪切强度随损伤程度的加深逐步降为 0，而有法向应力作用时，剪切强度有随损伤程度的 加深逐步降低的趋势，但存在一定的波动。这表明，采用剪切波，尤其是卸载剪切波来探测岩石内部动态损伤非 常有效。 关键词：岩石力学；冲击动力学；脆性材料；冲击；剪切 中图分类号：TU 45 文献标识码：A 文章编号：1000 –6915(2007)增 1 –3416 –05 INVESTIGATION ON IMPACT RESPONSES FOR ROCK-LIKE BRITTLE MATERIALS FEI Huiyang ，XU Songlin ，TANG Zhiping (Key Laboratory for Mechanical Behavior and Design of Materials of Chinese Academy of Sciences，University of Science and Technology of China，Hefei ，Anhui 230027 ，China) Abstract ：Investigation of impact responses for rock-like brittle materials nowadays is mainly focused on the experiments of compression impacting. However，the impact-induced damage behaviors of rocks can not be fully revealed only by the compression process for the special properties of rock-like materials. Based on a so-called transversal shear wave tracing technique(SWT) proposed by Professor Z. P. TANG，series of experiments for rock salt and cementitious composites subjected to shear and compression combined impact loadings are conducted. The transversal impact responses are used to reveal the damage property of brittle materials. When the brittle material is in the damage state ，the rule of the compression pr