Numerical Simulation of Rock Damage Characteristics under Different Coupling Media
In order to explore the rock damage characteristics of air and water uncoupled blasting,the rock damage evolution process,fracture range and peak pressure of hole wall after blasting of five groups of uncoupled coefficient models were analyzed by numerical simulation.Finally,field tests were carried out to verify the numerical simulation results.The results show that with the increase of the radial uncoupling coefficient,the attenuation of rock damage area caused by the air uncoupling blasting is more obvious.The initial shock wave energy produced by the water-uncoupled blasting is larger,and the energy utilization rate in the propagation process is higher.Due to the almost incompressibility of the water medium,the energy can act on the hole wall more smoothly and evenly.Under the condition of the same uncoupling coefficient,the peak pressure of the hole wall after water uncoupling blasting is larger,but the water medium can produce better protection effect on the hole wall,and the effect is better after the tunnel smooth blasting test.The above research can provide a certain reference for the selection of tunnel smooth blasting charge structure.
different coupling mediauncoupling coefficientpeak pressure of hole wallcrack propagationrock damage
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