岩体中平行裂隙相互影响的数值分析

Numerical Analysis on Interaction of Parallel Cracks

采用有限元法 ,对岩体在拉剪综合作用下平行双裂纹相互影响的情况进行了计算。结果表明 ,由于裂纹的相互干扰 ,故裂纹周边存在影响加强区与影响减弱区 ,相邻裂纹尖端处于不同的区域时 ,其应力强度因子的变化情况不同 ;当裂纹相邻端距离较小时 ,裂纹远离端的应力强度因子较相邻端的应力强度因子值要大 ,表明裂纹将在远离端首先发生开裂 ;当裂纹间距较大时 。

The interaction between two parallel cracks in rock mass under the combined action of tension and shearing is analyzed by finite element method. The results imply that there are intensified zone and weakened zone of SIFs around cracks because of the interaction between cracks. The variations of SIFs of cracks are different when their tips are in different effecting zones. When the distance between the tips of different cracks is short enough, the SIFs of remote tips are larger than the intimate tips', and this implies the cracks will propagate from the remote tips. And the interaction can be neglected if the distance between cracks is large enough.