Research and Application of Microseismic Monitoring of Mining Instability of Overlying Rock Mass in Caving Goaf
It is difficult to measure the thickness of gob and overburden in sublevel caving without pil-lar,and the sudden instability of goaf roof may cause large area caving,resulting in shock wave which will harm the safety of underground operation.With the overlying rock mass in a typical goaf formed by caving method as the research object,Moore-Coulomb geotechnical constitutive model and FLAC3D finite element software are used for numerical simulation to determine the key monitoring positions and objects of overlying rock mass in the goaf.Through the analysis of monitoring data for a long time,the waveform characteristics of main microseismic source are summarized and verified by typical microseismic events.The research results show that the microseismic energy signal waveform generated by the deformation and fracture of under-ground rock mass due to the increase of stress is generally 15～30 ms,and the elastic wave shape generated by the tensile action of typical rock fracture surface only has P-wave phase,and the signal amplitude is re-lated to the distance between the fracture source and the sensor.
overlying rock mass of goafmining instabilitymicroseismic monitoringsource wave-form
万方数据
维普
