Study On Gas-liquid Composite Loading Of Rock Burst Simulation Test

Study of rock burst is the rock mechanics discipline research hotspot and difficulty. Based on the analysis of the disturbance, on the basis of development process and the mechanism of rock burst, the improved gas-liquid composite model test device, the rock burst was determined under different stress gradient loading way of model test of rock burst of specimen damage, deformation and acoustic emission characteristics of internal parameters and intensity of rock burst is analyzed, study of damage mechanism of rock burst system.(1) "Disturbance" development process of rock burst, analysis, summary "disturbance" rock burst theory, namely the occurrence of rock burst through static load in the early pregnant, dynamic disturbance trigger rock burst, the surrounding rock mass of "body" rock burst energy supplement and dynamic rock mass in a violent tearing, throwing phenomena such as rock burst phenomenon.(2) Through in door test specimen has carried on the experimental research on the different clamping material, combination clamping specimen failure pattern, stress and strain, the relationship between ae parameters and time, such as selection of alumina cement as brittle gypsum specimen clamping materials, overcome the conventional clamping material cementation strong sex, artificially enhanced bonding among parts of the strength and toughness, lead to the shortcoming of specimen damage distortion. Based on small specimens under different loading stress-strain relationship and the change law of ae characteristic parameters, model test can be applied at the top of the first when the load to 40% of the uniaxial compressive strength, exert confining pressure again, can promote the top load transfer to the engineering rock mass.(4) The occurrence of rock burst and intensity is related to three factors: one is the energy concentration degree of vertical fracture step-increased loading value, the greater the local stress concentration degree is higher, the more prone to rock burst phenomenon, the higher the intensity of rock burst. Two is to destroy the energy release rate, local stress concentration degree is higher, the faster the energy release rate, the more energy is converted into kinetic energy, the more prone to rock burst phenomenon, the higher the intensity of rock burst. Three is extrapolated horizontal stress. Extrapolating horizontal force can timely supplement body rock burst of energy and momentum, to speed up the damage energy release rate, increase the intensity of rock burst.(5) Stress gradient at different levels have different values lead to local stress concentration, decided to the size of the single channel energy, impact specimen of the early stage of the energy dissipation, energy of agglomeration and moment of rock burst energy release rate, reflecting the intensity of rock burst, so take the uniform load of small size specimen to realize the phenomenon of rock burst, have some limitations.