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对中等风化灰岩开展单轴循环加卸荷载试验研究,并用偏光显微镜对破坏岩体切片的微裂隙发展规律进行观察,得到以下结论:1循环荷载下,由于损伤积累作用,使岩体峰值强度降低,峰值应变与破坏点应变之间的差值明显减小;2在岩体稳定变形阶段,微裂隙发展主要受主应力方向控制,并不一定沿矿物集合体接触面或软弱结构面走向扩展,在不稳定变形阶段,微裂隙的相互连接方式与其走向夹角及其相隔距离有关。偏光显微镜观察可以直观地揭示微裂隙发展的定性规律,对以后的微裂缝发展规律的定量研究具有一定的指导意义。
Uniaxial weathered limestone loading and unloading test carried out uniaxial cyclic loading test, and polarized microscopy on the destruction of rock slice microcracks development observed, the following conclusions: 1 cyclic loading, due to damage accumulation, so that the rock mass peak strength The difference between peak strain and failure point strain decreases obviously.2 The development of micro-fractures is mainly controlled by the direction of principal stress in the stable deformation stage of rock mass and does not necessarily extend along the contact surface of mineral assemblage or the weak structural plane In the unstable deformation stage, the way of the mutual connection of the micro-cracks is related to the distance between them and their separation distance. Polarizing microscope can visually reveal the qualitative rules of the development of microcracks, which is of guiding significance for the quantitative study of the development of microcracks in the future.