Considering the recent developments of deep mining, investigating the rock properties under high ground stress periodic load is highly demanded. Studies show that these characteristics are important factors affecting the long-term steadiness of rock. However, the mechanical properties of rock mass without macro failure after cyclic load should be studied. In the present study, granite in a mine is considered as the research object. A rock pre-damage experiment is conducted with the same cycles under different confining pressures and constant cycle upper and lower limit loads. The pre-damaged rock sample is subjected to a uniaxial compression test, and a high-speed charge couple device camera is used to record the speckle field image of the sample surface during the whole loading process. The digital speckle techniques are used to analyse the image of the pre-damaged sample, the deformation field of the specimen surface, the displacement dislocation value of the localized deformation area and the deformation energy value of the specimen surface. The results show that for the same cycle times, the confining pressure is less than 80 MPa, which has a weakening effect on the rock's axial strength. As the confining pressure approaches 120 MPa, the pre-damaged rock uniaxial peak strength increases. The characteristics of displacement dislocation energy evolution of the localized deformation bound are divided into three stages (pre-peak stage, peak point and post-peak stage). After pre-damage under the same cycle times and different confining pressure conditions, the deformation field evolution of rock is relatively consistent.

考虑到最近深部采矿的发展，对高地应力周期性载荷下的岩石特性进行研究是非常需要的。研究表明，这些特性是影响岩石长期稳定性的重要因素。但应研究循环荷载作用下无宏观破坏的岩体力学特性。本研究以某矿山的花岗岩为研究对象。在不同围压和恒定循环上下限载荷下，进行了相同循环的岩石预损伤试验。对损坏前的岩石样品进行单轴压缩试验，利用高速电荷耦合器件摄像头记录整个加载过程中样品表面的散斑场图像。利用数字散斑技术对损伤前试样的图像、试样表面的变形场、局部变形区的位移位错值和试样表面的变形能值进行分析。结果表明，对于相同的循环次数，围压小于80 MPa，对岩石的轴向强度有弱化作用。随着围压接近120 MPa，破坏前岩石单轴峰值强度增加。局部变形界的位移位错能量演化特征分为三个阶段（峰前阶段、峰点和峰后阶段）。相同循环次数、不同围压条件下预损伤后，岩石变形场演化较为一致。