Development of a servo-controlled rock triaxial test system with dynamic disturbance and its application

A self-developed servo-controlled rock triaxial test system with dynamic disturbance is introduced in detail. The test system can apply dynamic disturbance in the process of conventional triaxial compression. The test system consists of four parts: axial loading subsystem, confining pressure subsystem, dynamic disturbance loading subsystem and data collection subsystem. The maximum axial load and confining pressure of the test system can be 2 000 kN and 70 MPa, and the maximum dynamic disturbance load of the system can be 300 kN and the highest frequency of the dynamic disturbance load is 70 Hz. A set of experiments about dynamic disturbance in uniaxial compression is performed on marble with the developed test system. The experimental results indicate that: when the amplitudes of the dynamic disturbance are in the same frequency, the larger the amplitude of disturbance is, the shorter time is the disturbance to the rock failure, vice versa. It can be seen from the failure modes after experiments that the marble samples are fragmentized under the dynamic disturbance load. The lower the amplitude of the dynamic disturbance load is, the higher degree of fragmentation is. The servo-controlled rock triaxial test system is stable and reliable, thus it is worth generalizing the use of the testing system in other laboratories to explore mechanical properties of deep rocks. © 2017, Science Press. All right reserved.