For hard rocks as granite, rock mass class is mostly associated with discontinuities.
花岗岩这样的硬质岩石，其岩体质量与结构面关系极为密切。
The test results show that the permeability of hard rocks is obviously different from that of soft rocks not only in permeability-strain behavior but also in value of coefficient of permeability.
试验结果反映出在变形过程中不论是渗透性 -应变关系特点 ，还是渗透性量值 ，软岩和硬岩均表现出明显差异。
Studying the variety laws of the plastic failure, distortion and stress of soft and hard rocks alternate-layered roof with the constant vertical stress only the horizontal stress changing.
在垂直应力不变，不断改变水平应力的条件下，分析各类软硬岩互层项板的应力、变形、破坏规律。
Studying the variety laws of the plastic failure, distortion and stress of soft and hard rocks alternate-layered roof with the constant vertical stress only the horizontal stress changing.
在垂直应力不变，不断改变水平应力的条件下，分析各类软硬岩互层项板的应力、变形、破坏规律。
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