冻结裂隙砂岩单轴压缩损伤特性CT试验.pdf

第 24 卷 增 1 岩石力学与工程学报 Vol.24 Supp.1 2005 年 8 月 Chinese Journal of Rock Mechanics and Engineering Aug .，2005 冻结裂隙砂岩单轴压缩损伤特性CT 试验 任建喜 (西安科技大学 建筑与土木工程学院，陕西 西安 710054) 摘要：对含有预制双裂纹的冻结裂隙砂岩试样单轴压缩细观损伤破坏机理进行了 CT 动态试验，得到了裂纹萌生、 发展、宏观裂纹形成和破坏等不同阶段的岩石损伤 CT 图像和CT 数。研究结果表明，与无预制裂隙的冻结岩石试 样相比，已有预制裂纹对冻结裂隙岩石中新裂纹的起裂位置及贯通性宏观破坏裂纹的形成具有重要影响。预制裂 纹的存在导致冻结裂隙砂岩试样的扩容量大于完整冻结试样破坏时的扩容量。 关键词：岩石力学；冻结裂隙岩石；单轴压缩；细观损伤；扩展；CT 动态试验 中图分类号：TU 458+ .2 文献标识码：A 文章编号：1000 –6915(2005)增 1 –4670 –04 REAL TIME CT TESTING ON DAMAGE EVOLUTION CHARACTERISTICS OF FROZEN CRACKED-SANDSTONE UNDER UNIAXIAL COMPRESSION REN Jian-xi (School of Architecture and Civil Engineering ，Xi ′an University of Science and Technology，Xi ′an 710054，China) Abstract ：The CT testing study on meso-damage propagation characteristics of frozen cracked-sandstone with double man-made cracks under uniaxial loading using the CT special testing system is accomplished. The CT images and CT number in different stages，including micro-crack birthing，development，marco-crack birthing ， and sample failure，are obtained. It shows that，compared with the frozen intact rock sample，the man-made crack can seriously affect the location of new crack generation and the formation of connectivity macro-crack of frozen cracked-rock sample. Because of the man-made cracks existing ，the volume expansion values of the frozen cracked-rock sample under uniaxial compression are large than those of the frozen intact rock sample. Key words ：rock mechanics ；frozen cracked rock ；uniaxial compression ；meso-damage ；propagation ；real time CT testing