Variable seismic source form + energy type vibration cross-layer propagation research test platform

Abstract

The invention discloses a variable seismic source form + energy type seismic cross-layer propagation research test platform, which comprises a seismic source part, a stratum medium part and a monitoring analysis part. The seismic source part comprises a point seismic source, a line seismic source and a surface seismic source; the stratum medium part is used for simulating the point seismic source,the line seismic source and the surface seismic source to realize point, line and surface contact; and the monitoring analysis part is used for monitoring vibration data generated by point, line andsurface contact and predicting and analyzing vibration damages of strong mine earthquakes to the ground. With the variable source form + energy type vibration cross-layer propagation research test platform, different source forms and energy attenuation rules can be simulated and monitored. The platform is mainly composed of a stratum propagation medium simulation device, a seismic source form andenergy conversion device, an auxiliary control system and a vibration monitoring and collecting device, the three systems are independent of one another and can form a system, and the platform has theadvantages in the aspects of system preparation, assembly, maintenance and the like.

Description

technical field [0001] The invention relates to the technical field of assessment and prediction of ground damage in mining of extremely thick hard rock mines, in particular to a research and test platform for vibration transmission through layers with variable source form and energy. Background technique [0002] With the continuous depletion of shallow coal resources and the gradual increase in mining intensity and depth, mine dynamic disasters such as mine earthquakes occur frequently, which is still one of the main problems in the field of coal mining. focus on. [0003] By the end of 2019, the number of mine earthquakes or rock burst mines reported in my country was close to 190. The occurrence of mine earthquakes is closely related to the movement state of the thick and hard key strata above the stope. The fracture of the thick and hard key strata and the instability of the overlying strata's spatial structure will cause mine earthquakes of different intensities. my ...

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Problems solved by technology

The current mining ground damage prediction is still based on theories and methods such as surface subsidence and rock layer movement, which are mainly the research results of the early last century. Ground movement damage" has the characteristics of "hysteresis", and has not fully considered the impact of strong mine earthquakes on ground "vibration damage" induced by instantaneous fractures of huge thick hard rocks (strong mine earthquakes have "instantaneous" characteristics of ground vibration damage). Ground damage prediction must consider the above two factors at the same time

[0006] Relevant laboratories have carried out tests such as "blasting simulation-induced mine earthquakes", that is, by charging blasting in the formation medium and arranging vibration monitoring, simulating the vibration propagation of mine earthquakes and analyzing the damage effect of vibrations. Such test schemes are not applicable to this project. There may be some deficiencies in the research of the project: ①There are certain blasting safety issues; ②Due to the national control of blasting equipment and pyrotechnic products, it is difficult to use blasting tests; ③Simulate the damage and properties of the medium after blasting in the stratum change, the repetitive test effect is poor and the comparative analysis cannot be completed; ④ this type of test method is suitable for the analysis of "point source" and cannot realize the source models of "line source" and "surface source"

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