摘要
多裂纹间的岩桥贯通破坏是导致岩体失稳的重要原因之一。在裂纹分布已知的条件下,预知裂纹相互贯通的模式、机理及相应的外载条件,是预测和制止这类岩体失稳的前提。利用断裂力学中的裂纹尖端应力和应变场的极值分布情况,可以从根本上解决这一问题。当岩桥周围2条裂纹尖端拉应力、拉应变及剪应力极值方向能基本对应起来时,必然会导致2条裂纹的贯通,从而导致岩桥的贯通失稳。因此,这2个极值的性质决定了贯通破坏的性质。
Rock bridge fracture among multi-crack is one of the important reasons for rock mass failure. If the crack distribution near a rock bridge is known, it is the prerequisite to predict or refrain the failure of this kind of rock mass that the patterns, mechanism of failure and loading conditions are foreknown. These can be essentially obtained by the distribution analyses of the stress and strain extreme values near the crack tips according to the theory of fracture mechanics. The main result is that when the directions of the extreme values of two adjacent cracks are nearly towards each other, these two cracks will link together definitely and result in the rock bridge failure. The properties of the two extreme values determine the properties of the rock bridge fracture.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第23期4328-4334,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点基础研究发展规划(973)项目(2002CB412705)
国家自然科学基金资助项目(40472145)
关键词
断裂力学
岩桥破坏
多裂纹
极值
fracture mechanics
rock bridge failure
multi-crack
extreme value
