【摘要】 为探究裂隙对圆形隧洞围岩损伤变形的影响规律，以淮南矿区朱集西矿一采区煤矿巷道围岩为原型材料，配置相似材料，制作不同裂隙倾角、长度和位置的含孔裂隙微缩试件，通过含孔裂隙试件双向加载试验，研究预制裂隙和孔洞对试件变形破坏的影响。结果表明：试件在加载过程中均经历裂纹萌生阶段、裂纹发育阶段和破坏阶段3个阶段；根据裂纹的形成机制及形态特征，次生裂纹可划分为以下5类：张拉裂纹、剪切裂纹、拉剪复合裂纹、翼型裂纹和反翼型裂纹，且不同裂隙参数下试件的破坏模式呈现显著差异。更多还原

【Abstract】 To investigate the influence of cracks on the damage deformation of circular tunnel surrounding rock, similar materials were prepared using the surrounding rock of a coal mine roadway in a mining district of the Zhujixi Mine in the Huainan Mining Area as the prototype material. Miniature specimens containing holes and cracks with varying dip angles, lengths, and positions were fabricated. Through biaxial loading tests on holed and cracked specimens, the effects of prefabricated cracks and holes on specimen deformation and failure were studied. The results indicate that all specimens underwent three stages during loading: crack initiation, crack propagation, and failure. Based on formation mechanisms and morphological characteristics, secondary cracks can be classified into five categories: tensile cracks, shear cracks, tensile-shear composite cracks, wing cracks, and anti-wing cracks. The failure modes of specimens exhibited significant differences under varying crack parameters.更多还原