Abstract: In order to obtain the complete and real mechanics characteristic curve of rock, the rock mechanics testing system controlled by the microcomputer, electro-hydraulic servo control, was studied, which is based on the traditional mechanics test. The timing, trigger, and A/D conversion of the syetem are completed by multi-functional panel PC812PG, and the CPU control is not needed. The panel PC812PG sampling runs at the same time of CPU, which saves the of time CPU. The computer system has high efficiency, and avails to improve the frequency response of control system. The application and debugging of the rock testing system indicates that the system can be controlled exactly and smoothly, and the results of the experiment is reliable.

Key words: rock, mechanics characteristic curve, hydraulic servo control, tester