Coal seam floor water-inrush risk evaluation method based on combination of grey correlation and FDAHP

A technology of coal seam floor water inrush and gray correlation, applied in instruments, data processing applications, calculations, etc., can solve problems such as separation from objective reality and lack of scientific analysis

Inactive Publication Date: 2015-11-18
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has the following deficiencies: the "constant weight" is based on the AHP assignment method, there is no clear standard, and it lacks rigorous scientific analysis, which can easily lead to subjective arbitrariness; The combination of water inrush cases can easily lead to divorce from objective reality
This method uses principal component analysis to obtain the first six main control factors and their weights, which has great disadvantages

Method used

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  • Coal seam floor water-inrush risk evaluation method based on combination of grey correlation and FDAHP
  • Coal seam floor water-inrush risk evaluation method based on combination of grey correlation and FDAHP
  • Coal seam floor water-inrush risk evaluation method based on combination of grey correlation and FDAHP

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Embodiment 1

[0097] figure 1 It is a flow chart of a method for evaluating the risk of water inrush from a coal seam floor provided by the present invention. figure 1 In, the inventive method comprises the steps:

[0098] (1) Determine the main controlling factors of water inrush from the coal seam floor;

[0099] Controlling factors, including:

[0100] ① geological structure;

[0101] ②Thickness of effective waterproof layer;

[0102] ③Thickness percentage of brittle rock under mine pressure failure zone;

[0103] ④Water inflow from borehole;

[0104] ⑤Aquifer thickness;

[0105] ⑥Aquifer water pressure.

[0106] Further, the geological structure is a fault strength index.

[0107] Further, the geological structure is the density of fault intersections and pinch-out points.

[0108] Further, the geological structure is the fractal value of the fold axis.

[0109] (2) Data collection and standardization processing, and the establishment of thematic maps of the main controlling f...

Embodiment 2

[0170] The 13th coal seam is currently being mined in a certain mining area, and the Ordovician aquifer is relatively close to the 13th coal seam, which constitutes the main water-filled aquifer for the mining of the 13th coal seam. The Benxi Formation and Taiyuan Formation strata between the Ordovician and the 13th coal seam constitute the aquitard formation. The total thickness of the Ordovician limestone aquifer in this area is more than 800 m. There are a total of 30 downhole hydrological drilling holes in the well field to expose Austrian ash, and the water inflow from the drilling holes is 0-110m 3 / h, it can be seen that Austrian ash is extremely water-rich but the distribution is extremely uneven. Due to the existence of fractures and fissures, as well as the fissures produced by mining activities on the floor damage the integrity of the water-resisting layer group, the Austrian ash confined water may flow into the mining face along these channels under pressure. Dur...

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Abstract

The invention discloses a coal seam floor water-inrush risk evaluation method, which comprises the steps of: (1) determining main controlling factors of coal seam floor water inrush; (2) carrying out data acquisition and standard processing, and establishing thematic maps of the main controlling factors of the coal seam floor water inrush; (3) determining ''weights'' of the main controlling factors for controlling the seam floor water inrush by adopting a grey correlation and FDAHP index weighting method; (4) establishing a coal seam floor water-inrush risk index model, and calculating a coal seam floor water-inrush risk index; (5) verifying the model; (6) determining a water-inrush risk partition threshold value; (7) and dividing the coal seam floor water-inrush risk and making scientific evaluation. The coal seam floor water-inrush risk evaluation method combines the water-inrush examples with expert opinions, forms an interactive weight vector decision analysis process by adopting the FDAHP method, finally determines the weight vector which relatively conforms to the objective reality, and establishes the coal seam floor water-inrush risk index model conforming to the objective reality of a mining area, so that the evaluation results conform more to the actual production.

Description

technical field [0001] The invention relates to a method for evaluating the risk of water inrush from the coal seam floor based on the combination of gray correlation and fuzzy Delphi analytic hierarchy process (FDAHP). Background technique [0002] my country is one of the countries with the largest coal production in the world. At the same time, the geological and hydrogeological conditions of coal mines in my country are very complicated. The coal reserves threatened by water damage account for about 30% of the proven reserves. Only coal in North China that is threatened by floor confined water The reserves are about 20 billion tons. Water inrush from the coal seam floor is a very common problem in our country, almost involving most of the coal mining areas in our country, including the North China type and South China type coal fields. It is also one of the salient features of my country's coalfield hydrogeological conditions, and has become a major issue related to the d...

Claims

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Application Information

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IPC IPC(8): G06Q50/02
Inventor 施龙青滕超邱梅韩进
Owner SHANDONG UNIV OF SCI & TECH
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