Method for determining and optimizing dynamic pressure difference index of support in real time

Abstract

The invention discloses a real-time determination and optimization method for a dynamic pressure difference index of a support. The method is based on mass time sequence on-line monitoring data. The support dynamic pressure difference index real-time determination and optimization method comprises the steps: S1, in anomaly detection, employing a k-means clustering algorithm for screening out an index initial calculation value PA; S2, sampling a top plate, a bottom plate and a coal seam of the working face on site, and performing a rock mechanical parameter test to obtain the elastic modulus and Poisson's ratio mechanical parameters; S3, simulating field engineering conditions, performing excavation simulation, recording the stress change condition of the support in real time, and drawing a delta(P)-delta(L) relational graph; S4, calculating the delta(P) increment delta(P) (delta(L)) accompanied by different coal cutting distances delta(L) according to the delta(P)-delta(L) relation graph, and if delta(P)(delta(L)) / delta(P) (delta(L)) is smaller than an engineering calculation requirement, taking 3%, so the coal cutting distance delta(L) is optimized. Therefore, the dynamic pressure difference index of the support can be automatically determined and optimized 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 support dynamic pressure difference index. Background technique [0002] At present, there is no in-depth research on the support resistance of the monitored hydraulic support, and the support resistance of the support will remain constant under the action of the pressure relief valve after the support resistance reaches the maximum support resistance, which cannot further characterize the variation of the overlying rock stress. The analysis of the support resistance of the support only considers the relationship between the pressure of the support and the change with time, and does not reasonably consider the influence of the pressure change caused by the geometrical conditions of the stope caused by the coal cutting by the shearer. The "support dynamic pressure difference index" realizes the continuous perception of the...

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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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