The spatial variability in permeability plays an important role in the coupled hydro-mechanical processes of the fractured rock mass and induces a discontinuousdistribution of principal stresses.
渗透系数的空间变异性使得隧道开挖后围岩应力有明显的非连续性，对裂隙介质的耦合过程起着重要作用。
2
The difficulties of classification tasks are expressed by discontinuous category distribution and adding relevant dimensions and category number.
分类任务的难度主要通过增加相关维度的数量、类别刺激分布的间断性和增加类别数量等方式体现出来。
3
Moreover, the heterogeneity characteristics of post sedimentary diagenesis caused the isolated and discontinuous planar distribution of all types of reservoir.