水电能源科学

为探讨冻融循环对花岗斑岩破裂面特征及其破坏机制的影响，采用单轴压缩试验与高精度蓝光三维测量技术，结合分形理论定量分析了花岗斑岩在自然状态、饱和状态和冻融循环状态下的破裂面三维形貌特征。结果表明，冻融循环显著降低了花岗斑岩的抗压强度和弹性模量，并增加了破裂面的分形维数；相较于其他2种状态，冻融循环岩石破裂面的微裂隙及孔隙占比最高，颗粒连续性差，结合力弱，从而导致破裂面呈现更加粗糙和不规则的特征；冻融循环增加了破裂过程中的能量耗散比例，3种状态下的分形维数与能量耗散比例呈正相关性。

This study examines the effects of freeze-thaw cycles on the fracture surface morphology and failure mechanisms of granite porphyry. Through uniaxial compression tests and high-resolution blue light 3D scanning technology combined with fractal theory, three-dimensional morphology of fracture surfaces under natural, saturated, and freeze-thaw conditions were quantitatively analyzed. The results show that freeze-thaw cycles significantly reduce the compressive strength and elastic modulus of granite porphyry while increasing the fractal dimension of fracture surfaces. The freeze-thaw conditions lead to the most extensive development of microcracks and pores compared to natural and saturated states, causing reduced particle continuity, weakened cohesion, and rougher, more irregular fracture surfaces. Additionally, the freeze-thaw cycles increase energy dissipation during fracturing, with a positive correlation observed between the fractal dimension and the energy dissipation ratio across all three states.