Experimental Study on Deformation Monitoring of Physical Similarity Model Under Dynamic Load Disturbance
In order to reduce the occurrence of rock burst disasters during underground mining,this paper monitors the deformation of surrounding rock under dynamic load disturbance,studies the response law of deformation and failure of roadway surrounding rock and the accuracy of digital speckle technology in monitoring overburden rock deformation.The experiment is equipped with a refined physical similarity mod-el.DIC equipment is used to conduct regular and comprehensive monitoring of overburden migration on the working surface of the model during the mining process,and the changes of each monitoring point on the sur-face of the model with the advance of the working surface are recorded and the data are processed in detail.Combined with the actual situation on site,a pendulum is added as a dynamic load disturbance device.By changing the height and Angle of the pendulum to simulate the disturbance under different energies,the change image of overlying rock after the dynamic load disturbance is collected,and the state before the dis-turbance is compared to study the effect before and after the dynamic load is applied.The results show that after dynamic load is applied,the top rock of goaf is broken more obviously,the model caving height is basi-cally unchanged,and the roof subsidence increases significantly.After the last dynamic load is applied,the displacement cloud map of caving rock of goaf roof presents multiple double-peak fractures.The numerical speckle technique is used to analyze the overburden transport state before and after dynamic loading.The re-sults show that the looseness height of the model reaches the top of the model and the overall subsidence reaches 20 mm.The experiment reveals the response law of deformation and failure of roadway surrounding rock and the excellent performance of digital speckle technology in overlying rock deformation monitoring,which provides a certain theoretical basis and technical support for reducing the occurrence of rock burst ac-cidents and building green smart mines.
万方数据
维普
