A Mining Stress Assessment Method Based on Microseismic Damage Reconstruction

Abstract

The invention relates to a mining stress evaluation method based on microseismic damage reconstruction, which is suitable for use in the field of microseismic monitoring in the field of mine safety. Specifically include: meshing the evaluation area, and calculating the cumulative deformation energy ε of each mesh node by using the accumulation method Ei and the number of microseismic events N i or coal rock loading elapsed time Δt i , find the maximum cumulative deformation energy value max{ε Ei}, and calculate the average cumulative deformation energy ε F , the mining stress distribution can be obtained on the basis of calculating the damage parameter D distribution. This method has obvious physical and mechanical significance, clear calculation of involved parameters, strong universality and operability, is suitable for programming, has good application feasibility, and can realize approximate real-time inversion of mining stress during coal seam mining.

Description

technical field [0001] The invention relates to a mine mining stress assessment method, in particular to a mining stress assessment method based on microseismic damage reconstruction suitable for the field of mine safety microseismic monitoring. Background technique [0002] Mining stress is a secondary stress after the original stress in the surrounding rock body of the underground mining space is redistributed by the mining disturbance. Knowing the distribution characteristics of this stress is one of the indispensable important basis and work in the mining production process such as working face design, stop production line design, coal pillar design, safety protection design, support design and so on. [0003] Since the disturbance of coal seam mining is a dynamic process, the mining stress also changes dynamically all the time, which ultimately makes it difficult to directly observe and quantitatively describe this "black box" process in a large scale. At present, the ...

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Problems solved by technology

However, the seismic wave velocity tomography technology indirectly calculates the mining stress distribution based on the P-wave velocity distribution, and in the calculation process, a certain number of microseismic events are required as the original data for the inversion, which will inevitably cause problems during the inversion period. The unreasonable assumption that the P-wave velocity must be set as a constant leads to certain errors in calculation results. At the same time, the calculation amount of this technology is generally relatively large, and it is difficult to achieve real-time inversion; based on the evaluation of the spatial distribution of microseismic events, microseismic frequency density distribution and energy density distribution Although it can infer the distribution of mining stress by reflecting the distribution of mining fractures to a certain extent, it lacks obvious physical and mechanical correlation

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