岩石真三轴扰动诱变实验系统研制及应用

Development of rock true triaxial dynamic disturbance test system and its application

为了进行动静载荷组合作用下的深井矿山岩石破裂特性的研究,自行研制了型号为TRW-3 000的岩石真三轴扰动诱变实验系统。该系统与其他真三轴测试系统的主要区别在于该系统具有动-静载荷独立加载功能。基于地下工程开挖路径,利用该实验系统开展了真三轴卸载条件下动力扰动诱发破岩实验,初步证明相同幅值不同来向的扰动载荷可以诱导致特定应力状态下岩石的破裂。

In order to study the mechanical properties of hard rocks,a true triaxial dynamic mutagenesis test system is developed at Central South University,whose machine type is TRW-3 000.The main functions of this system are that this system can realize the true triaxial static-dynamic loading.Using the self-designed testing system,the experiments of rock failure induced by disturbance are carried out.Firstly,the true triaxial stresses are loaded to rock specimens,which simulate the in-situ stresses.Then,according to the unload path of shaft excavation,the stress in the direction of the minimum principal stress is unloaded fast,keeping the stress on the direction of the intermediate principal stress,and the stress on the direction of the maximum principal stress is increased by a factor of 3.6.At last,the disturbance with different source directions is applied until the rock failure.The research results show that the rock failure can be induced by disturbance coming from different directions（parallel to or perpendicular to the maximum principal stress orientation）.