Clear pictures in the paper.

To investigate the influence of the fractured rock-concrete interface on the mechanical response of the rock mass and engineering, the mechanical properties and energy evolution of granite-concrete composite specimens with 16 different fracture inclinations were examined through uniaxial compression particle flow simulation. The results show that when the relative area is constant, the larger the fracture dip angle is, the compressive strength of the composite body presents a similar “peak” type change; the dip angle appears to have the maximum value at 60 o and 90o and the minimum value at 0 o and 30 o, while the peak elastic modulus presents a “waterfall” type change, and the maximum value appears at 90o. The crack types were classified as shear cracks, tensile cracks, secondary shear cracks, secondary tensile cracks, shear-dominated mixed cracks, and tension-dominated mixed cracks. From the crack distribution, it was found that the root cause of crack initiation and propagation was affected by the crack inclination angle. The damage degree increased gradually with the increase of crack inclination angle. When the crack inclination angle was constant, the deterioration degree of the specimen weakened with the increase of relative area s. The elastic energy consumption ratio increases with the shaft deformation, first rapidly and steeply decreasing to the steady inflection point, then slowly increasing to the rapid and steep increase, showing a “fishhook” shape. When the strength failure occurs, the growth speed increases suddenly, and the elastic energy consumption ratio increases suddenly after the K peak. This phenomenon can be used as the basis for the occurrence of strength failure and can be used as a qualitative judgment of strength failure.

为探究节理岩石-混凝土界面（fractured rock-concrete interface）对岩体及工程力学响应的影响，本文通过单轴压缩颗粒流模拟（uniaxial compression particle flow simulation），对16种不同节理倾角（fracture inclination）的花岗岩-混凝土复合试样（granite-concrete composite specimens）的力学特性与能量演化规律开展了研究。研究结果表明：在相对面积固定的条件下，复合试样的抗压强度随节理倾角增大呈现类"峰型"变化规律；其峰值在60°与90°时达到最大，在0°与30°时处于最低；而峰值弹性模量（elastic modulus）则呈现"瀑布型"变化，且在90°时取得最大值。将裂纹类型划分为剪切裂纹（shear cracks）、张拉裂纹（tensile cracks）、次生剪切裂纹（secondary shear cracks）、次生张拉裂纹（secondary tensile cracks）、以剪切为主的混合型裂纹（shear-dominated mixed cracks）以及以张拉为主的混合型裂纹（tension-dominated mixed cracks）。通过裂纹分布特征分析可知，裂纹起裂与扩展的根本诱因受节理倾角调控；试样的损伤程度随节理倾角增大逐渐加剧。当节理倾角固定时，试样的劣化程度随相对面积s的增大而减弱。弹性能耗比（elastic energy consumption ratio）随轴向变形的变化呈现"鱼钩型"规律：先快速陡降至稳定拐点，随后缓慢上升至快速陡增阶段。当试样发生强度破坏（strength failure）时，弹性能耗比的增长速率突增，且在K峰后弹性能耗比出现突变。该现象可作为强度破坏发生的判定依据，用于对强度破坏进行定性判断。