Real-time determination and optimization method of dynamic pressure difference index of support

Abstract

The invention discloses a real-time determination and optimization method for a support dynamic pressure difference index, which is based on massive time series online monitoring data. The real-time determination and optimization method of the dynamic pressure difference index of the support includes: S1, in the abnormal detection, use the k-means clustering algorithm to screen out the initial calculation value of the index P A . S2. Sampling the roof, floor, and coal seam of the working face on site, and doing rock mechanics parameter tests to obtain the elastic modulus and Poisson's ratio mechanical parameters. S3. Simulate the site engineering conditions, carry out excavation simulation, record the force changes of the support in real time, and draw the ΔP‑ΔL relationship diagram. S4, calculate the ΔP increment ΔP with different coal cutting distance ΔL according to the ΔP-ΔL relationship diagram 增 (ΔL), if ΔP 增 (ΔL) / ΔP(ΔL) is less than the engineering calculation requirement, then take 3% to optimize the coal cutting distance ΔL. Thereby, the present invention can automatically determine and optimize the dynamic pressure difference index of the support in real time.

Description

technical field [0001] The invention relates to the technical field of coal mines, in particular to a real-time determination and optimization method for a dynamic pressure difference index of a support. Background technique [0002] At present, no in-depth research has been carried out on the monitoring hydraulic support support resistance, and after the support support resistance reaches the maximum support resistance, it will remain constant under the action of the pressure relief valve, which cannot further characterize the change of the overlying rock stress. The analysis of the support resistance of the support only considers the change of the pressure of the support with time, and does not reasonably consider the influence of the pressure change caused by the change of the stope geometry caused by the shearer cutting coal. The "support dynamic pressure difference index" realizes the continuous perception of the stress change degree of the overlying rock in the coal mi...

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Problems solved by technology

[0003] On the spot, we can only obtain the time series raw data of the working resistance of the support, without indicating figure 1 The working resistance value after the middle 3# bracket is connected to the top (such as figure 1 The working resistance value at the position indicated by the dot in the middle), and at the same time need to figure 2 Some interfering turning values ​​of the curve in the middle line frame are eliminated, these values ​​are often caused by the active pressurization process of the stent or the adjustment of the position

However, the "support dynamic pressure difference index" needs to be presented in real time during the on-site application process. Due to its massive characteristics, manual processing cannot meet the requirements. It is necessary to design an automatic machine processing method for calculation figure 2 The working resistance value at the position indicated by the dot in the middle

[0004] At the same time, the distance of ΔL should not be too short. The "support dynamic pressure difference index" obtained by the too short horizontal coal cutting distance ΔL is easily affected by the process of moving the adjacent support, and the fluctuation of the index value caused by it will affect the application of index judgment. the accuracy of

And the distance of ΔL should not be too long, too long ΔL is prone to increased resistance caused by deformation and extrusion caused by overlying rock damage, which interferes with the normal index value, thus causing misjudgment of the index (such as image 3 In the wireframe area, there is no horizontal coal cutting but a certain amount of ΔP is still generated)

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