Method for predicting water accumulation amount of goaf filled with water in loess

A prediction method and goaf technology, applied in the field of safety engineering, can solve problems such as limited scope of application, difficulty of analogy, difficulty in satisfying and other problems, and achieve the effect of wide application range, high precision, simple and easy implementation

Pending Publication Date: 2022-01-28
LIUPANSHUI NORMAL UNIV
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Problems solved by technology

[0003] 1) It is difficult to find completely similar conditions by the analogy method, that is, the scope of application is limited
[0004] 2) The theoretical assumptions of the Dajing method are relatively harsh and difficult to meet
Especially when loess is used as the water-filled layer, due to the complex seepage of loess and the complicated mechanism of coal mining di

Method used

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  • Method for predicting water accumulation amount of goaf filled with water in loess
  • Method for predicting water accumulation amount of goaf filled with water in loess
  • Method for predicting water accumulation amount of goaf filled with water in loess

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Embodiment

[0059] The surface of a mine in northern Shaanxi is covered by thick layers of loess, and water resources are generally scarce. However, after coal mining, there is often a lot of water in the goaf. Due to the complex situation of water accumulation in the goaf, it is impossible to determine whether the water accumulation is fully explored and released. Therefore, it is necessary to predict the accumulation of water in the goaf, specifically for the N5204 coal mining face, which mines 5-2 coal, and the specific steps are as follows:

[0060] Step 1: Before coal mining, obtain loess samples in the full depth range of the coal mining area through drilling.

[0061] Step 2: Before coal mining, bury the stress sensor in the loess, including the following process:

[0062] Every 1-10 meters in the vertical direction of the loess is a section, and one stress sensor is buried in each section, and n=12 are buried in total, that is, the loess is divided into 12 sections. Among them, ...

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Abstract

The invention discloses a method for predicting the water accumulation amount of a goaf filled with water in loess. The method comprises the following steps: before coal mining, segmenting a loess layer in a full-depth range of a coal mining area along the vertical direction; in the coal mining process, calculating the thickness of each section of the loess layer covered on the goaf under coal mining stress disturbance; after coal mining is finished and a goaf is closed, obtaining the thickness of each section of the overlying loess layer at different moments, and calculating the thickness change value of each section of the overlying loess layer due to creep deformation at different moments; calculating the thickness change value of each section of loess layer of the overlying loess layer due to water release at any moment and the change value of the total thickness; obtaining the relationship between the change of the total loess thickness caused by water release and time; and calculating the water accumulation amount of the goaf at any moment by utilizing the relationship between the change of the total loess thickness caused by water release and time. The method is simple and easy to implement, has more applicable conditions, is wide in application range, adopts actually measured value inversion, and is higher in precision.

Description

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Claims

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Application Information

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Owner LIUPANSHUI NORMAL UNIV
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