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

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

technical field [0001] The invention relates to a certain overlap between the field of safety engineering and the field of mining engineering, and in particular relates to a method for predicting the amount of accumulated water in a goaf filled with loess water. Background technique [0002] In some areas, the loess-covered area is rich in coal reserves, and coal mining is threatened by water accumulation in the goaf. In order to safely exploit coal resources, it is necessary to assess the amount of water accumulated in the goaf, and then to explore and release it reasonably. There are many methods for predicting water accumulation in gobs in loess-covered areas, mainly including comparison method, large well method, and numerical simulation method. However, the existing technologies have the following problems: [0003] 1) It is difficult to find completely similar conditions by the comparison method, that is, the scope of application is limited. [0004] 2) The theoretic...

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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 disturbance, the accuracy is poor, and there is even an error of 1 order of magnitude

[0005] 3) On the one hand, numerical simulation requires a large amount of measured data; on the other hand, it is difficult to simulate coal mining disturbance and groundwater seepage at the same time, so it is difficult to accurately predict and implement numerical simulation technology.

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