RESEARCH ON KEY TECHNOLOGIES OF HIGH PRESSURE HYDRAULIC SYSTEM FOR ROCKS

For simulating the stress status and existing environment of the rock mass, a set of high pressure triaxial testing machine that can simulate various solution environments is needed to develop. A high pressure hydraulic system is designed in this paper. It can drive four pressure chambers at the same time. Supercharging of the system, joint structure sealing, the separation of the loading installation and liquids, system control methods are all discussed in details. A supercharging pressure cylinder is added to improve the confining pressure. A slant T-shape sealing method and isolation membrane are designed to strengthen the structure join static sealing performance and isolate the solution from pressure chamber. In the end the designed hydraulic system is simulated using the Sim-Hydraulic in MATLAB.The responsible speed of the co-ordinate control and the master-slave control of hydraulic cylinder is analyzed respectively with the adaptive Fuzzy-PID algorithm. The anti-jamming performance of system is also analyzed with the PID control and the adaptive Fuzzy PID control, respectively. Simulating results show that, the system shows better anti-disturbance ability under the adaptive Fuzzy-PID control comparing to the PID control. The hydraulic cylinder shows faster response speed under the adaptive Fuzzy-PID algorithm. This analysis can provide references to the design of triaxial hydraulic loading installation for rock.