软弱岩石蠕变破坏规律的探讨

来源期刊：中南大学学报(自然科学版)1987年第5期

论文作者：马明军 钟时

文章页码：494 - 500

关键词：岩石破坏机理； 蠕变破坏； 蠕变破坏强度； 岩石试验； 蠕变试验； 电子微探针分析软弱岩石； 长期强度； 岩体工程合理设计

Key words：Failure mechanism of rock； Creep rupture； Creep failure strength； Rock test； Creep tests； Electron micro-probe analysis； Free terms； Weak rock； Long-term strength； Rock mass engineering reasonable design

摘    要：本文根据东乡铜矿砂质页岩的单轴压缩蠕变试验结果,提出并论证了既能描述蠕变变形和破坏过程,又具有工程实用意义的几个特征参数,建立它们与作用载荷之间的关系.在此基础上,讨论了岩石的长期强度、工程设计强度、破坏时间预测和极限应变几个问题.最后,根据不稳定蠕变各阶段的微观结构的电子探针显微镜分析结果,提出了软弱岩石蠕变变形和破坏的机理.

Abstract: Based on the results obtained from the uniaxial compression creep tests of the sandy shale specimens of Dongxiang Copper Mine, several characteristic parameters, which can not only describe creep deformation and creep failure process but will also be of great value to us in engineering application, are presented and verified, and the relationships between these parameters and applied loads have been established in this paper. In addition, rock’s long-term strength, its engineering design strength, failure time prediction and its limit strain are discussed in terms of these relationships. Finally, according to the results obtained through scanning the electron microscope analyses of microstructure of the sandy shale samples in the different unstable creep periods, the mechanism of creep deformation and creep failure have been suggested.