煤田地质与勘探2011，Vol.39Issue(4)：43-48,6.DOI:10.3969/j.issn.1001-1986.2011.04.012
非贯通单节理岩体裂纹扩展方向研究
Study on crack propagation direction of intermittent single jointed rock mass
摘要
Abstract
It has a positive significance for further analysis of rock bridge failure mechanism and rock mass shear strength parameters to study crack propagation direction of intermittent jointed rock mass. The crack-tip stress field is derived from complex stress condition in the sight of fracture mechanics. Based on the existent rock bridge failure patterns, propagated crack of jointed rock mass is divided into two kind, tensile crack and shear crack. Then the formula of tensile angle θt is put forward according to Griffith failure criteria, and that of shear angle θC is also put forward according to Mohr-Coulomb failure criteria. Compared with other criteria and test, it shows that this criterion can accurately determine the direction of tensile crack growth, while the sheared angle needs further experimental verification. The result shows that the tensile crack propagation tends to bias towards the maximum principal stress direction under tensile stress and the angle between them is less than 15°. Under bidirectional tensile stress, tensile cracks tend to be far away from the maximum principal stress direction with larger crack angle. Under uniaxial compression, tensile angle decreases with the crack angle increasing, while their sum decreases and then increases.关键词
非贯通节理岩体/裂纹扩展机理/张裂角/剪裂角Key words
intermittent jointed rock mass/ crack propagation mechanism/ tensile angle/ sheared angle分类
建筑与水利引用本文复制引用
章广成,胡静..非贯通单节理岩体裂纹扩展方向研究[J].煤田地质与勘探,2011,39(4):43-48,6.基金项目
国家自然科学基金面上项目(40872175) （40872175）
国家自然科学基金青年基金项目(40702050) （40702050）
