A triaxial roadway model and digital photogrammetry were used to analyze the deformation of the surrounding rock that had intermittent joints. The effect of the intermittent joints on the production, growth and size of the broken zone in the rock was investigated. Crack initiation, propagation and coalescence mechanisms as well as failure behavior of the rock are discussed. The results show that crack propagation and coalescence within the joints produce interlaced cracks in the surrounding rocks. Intermittent joints influence the development of a broken rock zone in a usually unsymmetrical way. The broken rock is produced primarily nearby the roof joints of the roadway and then it expands into the conjoint part. The maximum thickness of the broken rock zone parallels the joint while the minimum thickness is normal to the direction of the joint.
|Number of pages||5|
|Journal||Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology|
|Publication status||Published - 1 Jan 2008|
- Broken rock zone
- Intermittent joint
- Model experiment