实时准确掌握岩石破坏全过程中内部裂隙扩展演化规律，对于科学指导地下岩体工程稳定性控制，推动矿山资源安全开采具有重要的工程意义。研制了一套能够与CT扫描系统配套的真三轴加载试验设备，位于CT扫描区域的设备部件均采用了新型碳纤维材料的设计，包含了竖向加载系统、横向加载系统、真三轴压力室等核心部件，使得X射线能够有效通过装置中预先设计的CT扫描区域，实现了真三轴应力环境下实时CT扫描的功能。利用该设备开展了三轴不同应力条件下完整岩石和含裂隙岩石加载实时CT扫描试验，获得了整个加载过程中岩石应力-应变曲线。获取了不同工况下岩石内部裂纹形态的空间三维CT特征，结果发现：与CTT条件下岩石内部裂纹复杂的空间扩展形态相比，TTT条件下岩石内部裂纹空间形态简单，为一沿方向的平面裂纹。说明了真三轴条件下岩石内部裂隙具有明确的扩展方向(沿方向扩展)。TTT-c2(含裂隙且沿方向)和TTT-c3(裂隙沿方向)两种工况下岩石内部均出现了4条萌生裂纹，但前者萌生裂纹均与预制裂纹前缘线共面，而且预制裂纹面仍然基本保持较为完整；后者均与预制裂纹前缘线垂直，呈现横切预制裂隙的趋势，最终形成了复杂的裂隙网络，导致预制裂隙多处出现挤压破坏。真三轴三种工况下所有的裂纹倾角分布极为集中，均与方向大致平行，表明了中间主应力对岩石内部萌生裂纹扩展方向起到决定性的作用，岩石内部裂隙扩展发育过程强烈依赖中间主应力方向。试验研究为地下工程岩体破裂演化规律研究提供了重要的依据。

The real-time and accurate grasp of the internal fracture expansion and evolution law in the whole process of rock failure is of great engineering significance for scientifically guiding the stability control of underground rock engineering and promoting the safe mining of mine resources A set of true triaxial loading test equipment that can be matched with the CT scanning system has been developed The equipment components located in the CT scanning area are designed with new carbon fiber materials,including core components such as vertical loading system,lateral loading system,true triaxial pressure chamber,etc,so that X-rays can effectively pass through the pre-designed CT scanning area in the device The function of real-time CT scanning under true triaxial stress environment is realized This equipment was used to carry out real-time CT scanning tests of intact rock and rock with fractures under triaxial different stress conditions,and obtained the rock stress-strain curve during the entire loading process The spatial three-dimensional CT characteristics of the internal cracks in the rock under different working conditions are obtained,and the results show that:compared with the complicated spatial expansion of the internal cracks in the rock under the CTT condition,the spatial morphology of the internal cracks in the rock under the TTT condition is simple Plane cracks It shows that under true triaxial conditions,the internal fractures of the rock have a clear expansion direction (expanding along the σ2 direction)Four initiation cracks appeared in the rock under the two conditions of TTT-c2 (with cracks along the σ2 direction) and TTT-c3 (cracks along the σ3 direction)However,the initiation cracks of the former are all coplanar initiation cracks with the front edge of the pre-crack,and the pre-crack surface remains basically intact;the latter are all perpendicular to the front of the pre-crack,showing a trend of transversely cutting the pre-crackEventually a complex network of fractures was formed,resulting in more prefabricated fractures and backlog damage Under the three working conditions of true triaxial,all the crack inclination angle distributions are extremely concentrated,which are roughly parallel to the σ2 direction It shows that the intermediate principal stress plays a decisive role in the propagation direction of initiating cracks in the rock,and the propagation and development process of the internal rock cracks strongly depends on the direction of the intermediate principal stress.