【作者】 任建喜；

【Author】 REN Jian-xi (School of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, China)

【机构】 西安科技大学建筑与土木工程学院；

【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。更多还原

【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 cn 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.更多还原