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采用弹脆性本构模型以及滑移破坏理论,对深部围岩应力分布以及变形破坏机制进行分析。计算结果表明,开挖卸荷将引起剪应力的增长,滑移剪切变形的发展将围岩划分成具有一定尺度的块体(或条带),它们之间的相互摩擦决定着残余强度的大小;在各向不均匀压缩的作用下,深部围岩能够产生区域拉伸破碎,使围岩开挖断面监测到的位移大大超出按连续介质理论计算得到的数值。采用考虑扩容的计算模型可以得到围岩产生区域拉伸破碎的条件,计算得到的该条件与岩体力学性质以及破碎尺度密切相关。
Using the brittleness constitutive model and the slip damage theory, the stress distribution and the deformation and failure mechanism of deep surrounding rock are analyzed. The results show that the excavation unloading will cause the growth of shear stress. The development of slip shear deformation divides the surrounding rock into blocks (or strips) with a certain scale, and the mutual friction between them determines the residual strength Size; under the effect of non-uniform compression in all directions, deep surrounding rock can produce regional tensile and broken, so that the displacement monitored by the surrounding rock excavation section greatly exceeds the value calculated by the continuous medium theory. Using the calculation model considering expansion, we can get the conditions of tensile and crushing of surrounding rock, and the calculated conditions are closely related to the mechanical properties of rock mass and the crushing scale.