Sublevel caving/mining longwall face goaf flow filed simulation test device and method

Abstract

The invention provides a sublevel caving / mining longwall face goaf flow filed simulation test device and method. The device and method are suitable for obtaining the test data for use through simulation. The simulation test device comprises a test box body, wherein the test box body is filled with a simulation coal seam. A goaf flow filed test system is arranged below the simulation coal seam. When the simulation test device is used, the goaf flow filed test system is started so as to simulate the coal seam collapsing process of the coal seam goaf, the coal seam is ignited through the goaf flow filed test system, and the flow field information generated after the coal seam is burned is collected. The test method is simple, and simulation result is of great guiding significance in knowing the fire state and the gas migration rule of the goaf and treating the spontaneous combustion and gas disasters in the goaf.

Description

technical field [0001] The invention relates to a test device and method, and is especially suitable for a fully mechanized caving / longwall working face goaf flow field simulation test device and method used for simulation and acquisition of test data in mine safety. Background technique [0002] In the process of mine mining, as the working face advances, the coal seam is mined out, the original mechanical balance of the stope is destroyed, and the overlying strata that loses support is displaced and deformed until it collapses, forming a large number of rocks behind the working face. A goaf formed by loose coal and rock deposits. [0003] The recovery rate of fully mechanized caving working faces in thick coal seams is generally below 80%, and there are many coal residues in goafs, which become the material basis for spontaneous combustion; Ellipsoid-shaped caving and broken zones, the goaf will not be compacted in a short period of time, the air leakage channel is unbloc...

AI Technical Summary

Problems solved by technology

The objectivity of numerical simulation is not strong, and the conclusions tend to deviate from the reality. The above shortcomings must be overcome on the premise of physical simulation or field measurement data correction, which makes the physical simulation of goaf flow field particularly important.

At present, most of the existing physical simulation methods for the goaf flow field are to directly fill the closed space with granular media, such as crushed coal, gravel, etc., to simulate the goaf, and these fillings are not loaded with overlying pressure. , even if the overlying pressure is loaded in some models, the loading force is not similar to the actual stress of the overlying formation, that is to say, the influence of mine pressure on the goaf flow field is not considered, so the The nature of the flow field is completely reflected in the similar model, which leads to the fact that the research conclusions obtained through physical simulation cannot be well matched with the actual situation.

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