Study On Micro Seismic Mode, Location Of Rock Mass And Its Collapse Prediction

By analyzing the energy variation in rock mass which contained defects, the necessaryand sufficient conditions of micro seismic (MS) had been put forward theoretically asCompared the experimental MS location and corresponding inner stress distribution, it was found that most MS events were caused by she;ir stress, accounting for about 1/2 ~ 2/3 of the whole events. So it concluded that most MS in-s:tu were from shear stress as well.It was first time in this paper to simulate the MS with Picture-Process Method. The result indicated that MS modes may be different through different detecting critical value. By wavelet analysis method MS signals were decomposed, reconstructed and de-noised. The PSD (Power Spectrum Density) analysis of MS energy aid frequency signals suggested that Welch method was better than FFT in improved resolving power. A computer code was written to optimize the parameters: Input the size of mining, distance of MS sensors, etc. and then the result could show whether and how the computation's convergence. This helped to arrange the sensors rationally. At the mean time sensors' correction had realized by coordinates' movement and rotation, and a correcting formula was given as well.By theoretical analysis and numerical computation of MS wave's propagation, the propagation law of wave in attenuation elastic-viscosity media had been given. By resolving the ill-stated equation through Regulation methoc, a location result had been worked out. Mathematical calculation indicated that distance, erergy, frequence of MS and their difference varied similarly. On this basis one parameter could be adopted to predict the breakage of rock mass, the parameter may be one of distance, energy and frequence. Then ANFIS (Adaptive Neuro-fuzzy Inference System) had been established and the relationship between safety index and distance, energy, frequence could be obtained by data-training.At last the MS system and its application wjre introduced. To reduce error, a method composing MS location and FEM had been brought forward to determine the possiblebreakage area.