岩石直接拉伸破坏中的能量耗散及损伤特征  

ENERGY DISSIPATION AND DAMAGE CHARACTERS IN ROCK DIRECT TENSILE DESTRUCTION

作　　者：喻勇[1,2] 张宗贤[1,2] 俞洁 廖国华 

机构地区：[1]长江科学院岩基研究所 [2]北京科技大学资源工程学院

出　　处：《岩石力学与工程学报》1998年第4期386-392,共7页Chinese Journal of Rock Mechanics and Engineering

摘　　要：采用新近发展起来的拉伸式Ｈｏｐｋｉｎｓｏｎ冲击装置（ＳＨＴＢ），成功地实现了对岩石试样的动态直接拉伸加载。利用圆柱形拉伸强度试样和切口圆柱拉伸断裂试样，并结合静态拉伸实验设备ＭＴＳ材料试验机，进行了岩石的动态拉伸强度、动态拉伸断裂、静态拉伸强度、静态拉伸断裂共４种情况下的拉伸破坏实验，并将这４种实验条件下的拉伸破坏试样沿其纵剖面剖开，利用光学显微镜观察岩石在其纵剖面上的破坏特征。观察表明，岩石拉伸破坏所消耗的能量与岩石破坏时所形成的内部损伤有着十分密切的联系。With newly developed tensile split Hopkinson bar(SHTB), the dynamic tensile loading is set up to rock specimen successfully. Using the round tension strength specimen and the notched round tension fracture specimen, with SHTB and MTS for dynamic and static tension loading, the following four types of experiments are carried out for rock: dynamic tension strength, dynamic tensile fracture, static tension strength and static tensile fracture. The destroyed specimens of these conditions are cut along their longitudinal sections, and the destruction characters of these specimens are observed with an optical microscope. It was found that there is a close relationship between the internal damage of rock specimens and their energy dissipation during failure.

关 键 词：岩石 直接拉伸 能量耗散 损伤 实验 

分 类 号：TU455[建筑科学—岩土工程]