A cohesive grain-based model (GBM) was employed to investigate the asperity damage response of jointed Aue granite under confined compression. The cohesive GBM was able to characterise both inter- and intra-grain contacts in distinct element method (DEM). We calibrated the model against the laboratory data, including confined and unconfined compression tests as well as Brazilian tensile test of Aue granite. We generated synthetic Aue granite specimens, including three different rock joint profiles with various joint roughness coefficients (JRC) from smooth to very rough (i.e. 4.6, 10.2, and 17.5). We conducted confined compression tests on the synthetic specimens under 2, 5, 10, and 40 MPa of confining pressures. The numerical results revealed that at high confining pressure (i.e. 40 MPa), the rock joint profile had a negligible influence of the damage response of the specimen, and only contributed to the reduction of strength. For the other numerical experiments, the intensity of asperity damage caused by grain crushing was more pronounced when the confining pressure was high. We concluded that the cohesive GBM framework has the potential to be used as a virtual laboratory for investigating the shear behaviour of jointed granitic rocks, which is challenging to be studied in the laboratory.

基于内聚力的颗粒模型（GBM）研究了密闭压缩条件下节理的Aue花岗岩的粗糙损伤响应。内聚性GBM能够使用不同元素方法（DEM）表征晶粒间和晶粒内的接触。我们根据实验室数据对模型进行了校准，包括密闭和无密压缩试验以及巴西Aue花岗岩的拉伸试验。我们生成了合成的Aue花岗岩标本，包括三个不同的岩石节理轮廓，其节理粗糙度系数（JRC）从光滑到非常粗糙（即4.6、10.2和17.5）。我们在2、5、10和40 MPa的围压下对合成样本进行了围压测试。数值结果表明，在高围压（即40 MPa）下，岩石节理轮廓对试样损伤响应的影响可忽略不计，仅有助于降低强度。对于其他数值实验，当围压较高时，由晶粒破碎引起的粗糙损伤强度更加明显。我们得出的结论是，内聚性GBM框架有可能被用作研究节理花岗岩岩石剪切特性的虚拟实验室，这在实验室中具有挑战性。