Method for quantitatively evaluating water inrush prevention performance of seam floor coal-series water-resisting layer
A technology of coal seam floor and quantitative evaluation, which is used in geophysical measurements, instruments, etc.
Inactive Publication Date: 2014-07-16
CHINA UNIV OF MINING & TECH (BEIJING)
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However, in general, previous studies on water inrush from the coal seam floor were mainly qualitative in terms of the hydrogeological conditions of the water-filled aquifer, the original in-situ stress and the mining in-situ stress, and the relationship between the total thickness of the coal-measure water-resisting layer and the lithological combination. Based on analysis, quantitative evaluation and prediction of the anti-outburst performance of the coal measure aquifer on the coal seam floor under the influence of geological structure, which has not played a key role in controlling water inrush from the coal seam floor
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[0055] The present invention will be described in detail below in conjunction with the accompanying drawings, taking a certain coal mine as an example.
[0056] In order to ensure the stable and sustainable development of coal production in a certain coal mine, rationally develop and utilize the existing coal resources, the coal of the upper group and the lower group of coal shall be mined together. However, as a mine in the North China type coalfield, the mine has the same problems as the North China type coalfield, that is, with the increase of mining depth, mining speed, mining scale and the continuous development of lower coal formations, the hazards from deep, highly confined water getting worse. The main manifestations are: with the continuous extension of the mining level of the mine and the mining of the lower group of coal, the mining depth is getting larger and larger, the hydraulic pressure of the Austrian ash confined water is increasing, and the potential danger o...
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The invention discloses a method for quantitatively evaluating water inrush prevention performance of a seam floor coal-series water-resisting layer. The method comprises the following steps of (1) determining main controlling factors of the water inrush prevention performance of the seam floor coal-series water-resisting layer; (2) establishing thematic maps of the main controlling factors; (3) determining a weight ratio of the main controlling factors controlling the water inrush prevention performance of the seam floor coal-series water-resisting layer by means of inversion recognition or learning training of a model through a modern linear or nonlinear mathematical method; (4) establishing an evaluation model of the water inrush prevention performance of the seam floor coal-series water-resisting layer by means of the GIS and data fusion technique, and calculating out water inrush prevention performance indexes; (5) reasonably determining regional thresholds of water inrush prevention performance according to analysis on the water inrush prevention performance indexes calculated out by units in evaluation regions through a natural breakpoint method; (6) performing scientific partition and predication evaluation on the water inrush prevention performance of the seam floor coal-series water-resisting layer. The method overcomes the shortcoming that water inrush prevention performance of the seam floor coal-series water-resisting layer playing a key role in controlling water inrush of a seam floor under the influence of geologic structures cannot be evaluated and predicated quantitatively in the prior art.
Description
technical field [0001] The invention relates to a method for evaluating the outburst prevention performance of a coal seam water-resisting layer, in particular to a quantitative evaluation method for the outburst prevention performance of a coal seam floor. Background technique [0002] my country is one of the countries with the largest coal production in the world, and more than 95% of the total raw coal production is underground mining. At the same time, the geological and hydrogeological conditions of coal mines in my country are very complex. The coal reserves threatened by water damage account for about 30% of the proven reserves. In North China alone, the coal reserves threatened by floor confined water are about 20 billion tons. [0003] Coal mine floor water inrush refers to the disaster phenomenon that the water in the confined aquifer under the coal seam suddenly rushes into the mining face, which increases the water inflow or floods the mine. The problem of wate...
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IPC IPC(8): G01V9/00
Inventor 武强
Owner CHINA UNIV OF MINING & TECH (BEIJING)