摘要
以断裂岩体长期稳定性为研究背景,开展岩体断面细观接触演化和长期力学行为的研究,借助CT检测方法,研究断裂岩体双翼表面细观接触状态、接触损伤演化等影响岩体长期力学行为的特征以及断裂岩石蠕变过程中粗糙表面凹凸体磨损及亚表面微裂纹、微孔洞发展等表面接触损伤演化规律。CT图片得出剪切蠕变破碎岩石的多种失稳模式,这几种破坏模式共同存在于岩石断裂面的剪切蠕变过程中,并在断裂面不同位置交替出现。通过三维重构初步了解断裂岩石损伤过程中新生断面的形成过程:断裂面在剪切蠕变过程中微凸体附近易产生损伤形成空洞或初始裂隙,随后大量空洞和裂隙发展形成裂纹网络,裂纹网络贯通形成新断裂面。
Based on the long-term stability of fractured rocks, this paper studies the micro-contact evolution and long-term mechanics of rock mass. By means of CT detection, the micro-contact mechanism and the macromechanics characteristics are studied, such as the uneven crack surfaces, the growing tendency of the micro-voids and cracks, and the evolution of the surface damage. Unstable modes of creep shear fractured rocks are revealed by CT scanning graphs. The unstable modes simultaneously appear in the creep shear process of fractured rocks and occur at different sites on the fractured surfaces. The overall growing process of new fractured surfaces could be studied by three-dimensional（3D） reconstructions. In the creep shear process of the fractured surfaces, damages are easily found near the uneven surfaces of voids and cracks. Thereafter, crack network appears with the development of many voids and cracks, which finally forms the new fractured surfaces.
作者
王煜曦
王金安
牛升晟
WANG Yuxi;WANG Jin’an;Niu Shengsheng(Beijing Geothermal Research Institute,Beijing 102218;School of Civil and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083)
出处
《城市地质》
2018年第2期64-71,共8页
Urban Geology
基金
国家自然科学基金项目(41172264)
国家重点基础研究发展计划(973项目
编号:2010CB731500)
