The pressure at which the rock matrix of an exposed formation fractures and allows fluid to be injected.
暴露岩层的岩体发生破裂并允许流体被注入时的压力。
Other researchers at the site had applied acid to dissolve the rock matrix in the laboratory, revealing the tiny phosphatized fossils.
同样地区也有其他研究者，在实验室中以酸溶掉岩石基质，找出了磷酸化的化石。
These types of structural surfaces are the weak part of the rock mass. Their stiffness and strength are much smaller than the rock matrix material.
这些各种类型的结构面正是岩体中的薄弱部分，它们的刚度和力学强度比岩石母体材料小得多。
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