莫尔强度理论是指由莫尔（O．Mohr）提出的判断材料剪切破坏的强度理论。莫尔强度理论是对最大剪应力理论的修正。莫尔于1900年提出了莫尔强度理论，认为材料发生破坏是由于材料的某一面上剪应力达到一定的限度，而这个剪应力与材料本身性质和正应力在破坏面上所造成的摩擦阻力有关。即材料发生破坏除了取决于该点的剪应力，还与该点正应力相关。这是岩石力学中应用最广泛的理论。
本文从理论上分析了格里非斯强度理论在岩体力学中应用的可能性，并用实验数据与莫尔强度理论进行了对比分析。
This article expounds and proves theoretically the formulae used in various calculations based on Griffith's theory of strength and the feasibility of its applications to rock mechanics.
根据莫尔—库仑强度理论推导了关于确定并行隧道合理间距的安全系数s。
Based on the Mohr-Coulomb theory, safety factor s was deduced and used to ensure the reasonable parallel tunnel distance and judge the stability of surrounding rock effectively.
本文首先借助于极限平衡方程以及莫尔-库仑强度理论，建立计算双滑块安全系数的表达式，然后，以该表达式作为目标函数，利用优化理论探讨了双滑块最厄险滑动面的确定方法。
In this paper the equation has been developed for calculating the factors of safety of the double sliding blocks by means of the limit equilibrium and the Mohr-Coulomb strength theory.
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