摘要
岩体的破坏往往是其中不连续面滑移与扩展的结果。在不连续面有效剪应力概念的基础上,提出了巷道临空不连续面激活的观点。分析了圆形断面巷道围岩中临空不连续面的激活深度,认为不连续面的激活深度与其倾角及抗剪强度有关,其中,抗剪强度对激活深度的影响较大,同样倾角的不连续面在巷道不同部位的激活深度也并不相同。采用岩体断裂力学的理论,分析了临空不连续面横向翼形裂纹扩展的模式,认为产生翼形裂纹最大可能的部位就是激活临界点。因此,巷道围岩中最大可能的破坏区深度即为不连续面的激活深度。
The failures of rock masses are often resulted by sliding or extension of discontinuities. Based on the idea of effective shearing stress, the viewpoint of activation of surface discontinuities is put forward. Activated depths of surface discontinuities which surround a tunnel with circular cross-section are analyzed. Results demonstrate that the activated depths of discontinuities are influenced by their inclinations and shearing strengths; and shearing strength plays a very important role in them, Discontinuities with same inclinations result different activation depths at different zones around a tunnel. Fracture mechanics theories are employed to analyze the growth of wing cracks of surface discontinuities. It implies that the deepest possible location where a wing crack can initiate is just the place of critical activation point, So the possible maximum depth of disturbed zone surrounding a tunnel is just the activated depth of discontinuities,
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第6期1197-1200,共4页
Rock and Soil Mechanics
关键词
临空不连续面
激活
围岩破坏区
断裂力学
surface discontinuities
activation： disturbed zone in surrounding rock mass
fracture mechanics
