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Risk assessment method of coal seam floor water inrush based on the combination of gray correlation and fdahp

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

Inactive Publication Date: 2017-03-29
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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  • Risk assessment method of coal seam floor water inrush based on the combination of gray correlation and fdahp
  • Risk assessment method of coal seam floor water inrush based on the combination of gray correlation and fdahp
  • Risk assessment method of coal seam floor water inrush based on the combination of gray 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

[0169] 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 method for evaluating the risk of water inrush from the coal seam floor, comprising: (1) determining the main controlling factors of the water inrush from the coal seam floor; (2) collecting and standardizing data, and establishing the main controlling factors of the water inrush from the coal seam floor Thematic map; (3) Using the gray correlation and FDAHP index weighting method to determine the "weight" of each main control factor on the control of floor water inrush; (4) Establish a coal seam floor water inrush risk index model to calculate the coal seam floor water inrush Risk index; (5) model test; (6) determine the water inrush risk partition threshold; (7) divide the water inrush risk of the coal seam floor and make a scientific evaluation. This method combines the water inrush examples with the opinions of various experts, uses the FDAHP method to form an interactive weight vector decision-making analysis process, finally determines the weight vector that is more in line with the objective reality, and establishes the coal seam floor water inrush risk that is in line with the objective actual situation of the mining area. The performance index model makes the evaluation results more in line with 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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Patent Type & Authority Patents(China)
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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