Study On The Excitation Effect Of Complex Symbiotic Dangerous Rock Failure

Practice shows that the large landslide are source rock aggregates when a rock block caving,the rapid release of strain energy in rock fracture surface induced by shock wave,damage and damage to the rest of the dangerous rock mass,which leads to unstable rock mass collapse aggregates.This article launches the research on complex symbiotic excitation effect of rock failure and achievements are as follows:(1)A simple model of rock fracture analysis,from the perspective of energy,when the crack extended,crack energy will reduce the release of strain energy and strain energy by bending strain energy and the shear strain energy,strain energy into new generation of crack surface energy,strain energy is transformed into a part of the surface energy the other part,into shock wave caving process,analysis and then combined with the kinetic energy conservation and momentum theorem of vibration wave into the process of caving rock kinetic energy,the kinetic energy is derived for rock caving departure velocity equation,vibration equation is derived by the impulse theorem.Do some basic explanation for the foundation the follow-up study of dangerous rock.(2)Proposed and demonstrated the collision with ground rupture cracks from the rock bottom contact point extended up to the top that is consistent with the experimental phenomenon.A detailed description of the process of rockfall cracking disintegration,analyzed the energy conservation equation of rockfall collision cracking,solve and verify the critical velocity and the critical height of the rockfall rupture equation established rockfall the disintegration of the energy equation,the broken rock was further analyzed by momentum and energy equations.(3)A falling perilous rock aggregate model,the cracks are not abstract through part of the bounded prism rock,and rock vibration model of shock wave effect.The wave equation of rock column vibration model,using mathematical method is employed to solve the particle vibration equation of unstable rock mass,further obtained particle stress equation and particle vibration velocity according to the experimental equation.The entity model,the vibration data of two particle to rock the acceleration sensor,the physical and mechanical parameters of this model using MATLAB equation,exact solution,two groups of data than that found error is 6.12%,to verify the practicability of this equation,is dangerous Provide the basis for subsequent quantitative research on rockfall induced vibration collapse.(4)According to the rock mass collapse,a complex symbiotic type rock failureexcitation effect experimental model,laboratory experiments are made according to the design of small scale model on avalanche excitation effect for rock in caving process of rock aggregates caused by high precision camera,gain control structure and the dynamic process of crack extension,get excited the vibration signal of the dangerous rock mass through the dynamic signal acquisition system,analysis of the vibration signal,the destruction of vibrating wave in complex rock type symbiosis attenuation law in all directions of transmission.(5)In the horizontal layer,the excited wave propagating from the air to the dangerous rock propagates gradually along the propagation direction,and the horizontal vibration in the vertical direction is gradually attenuated,and the vertical vibration is gradually attenuated in this direction.The level of layer parallel to the free surface of propagation of vibration wave attenuation along the propagation direction,less constraint increased vibration,the two coupling effect,excitation effect is enhanced;and the vertical direction by the horizontal vibration attenuation effect and performance to weaken the vibration effect;and the direction of vertical vertical vibration the attenuation effect,showed dramatic reduction of excitation effect.Shock wave propagation in the vertical direction,rock layer segmentation and gravity coupling performance under the excitation effect weakened first and then strengthen the horizontal vibration and the vertical direction;the vertical gradually attenuation,attenuation in the interlayer coupling and the top two decreases under the constraints of performance for the first vibration weakened after strengthening,and the changes are the more violent.Under natural conditions,inferred from our experiment data,if similar to the experimental model,began to disintegrate rock and rock aggregate size,the vibration phenomenon following the results of this experiment,if collapse critical rock block size is far smaller than the rock aggregate size,the vibration phenomenon is effective in a certain range,away from the vibration source in the process of overall weakening trend.