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Method for predicting permeability changes of rock massed covering working face under the condition of mining-induced influence

A mining impact and prediction method technology, applied in the field of mining, can solve the problems of poor timeliness, long time consumption, low reliability of permeability changes, etc., and achieve the effect of good real-time performance and high reliability

Inactive Publication Date: 2017-08-29
CHINA UNIV OF MINING & TECH
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Problems solved by technology

Although this method has good accuracy, it has the following disadvantages: 1) The experimental conditions loaded in the laboratory may be inconsistent with the real situation on site, and the reliability of the obtained permeability change is low; It takes a long time to obtain samples from the core

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  • Method for predicting permeability changes of rock massed covering working face under the condition of mining-induced influence
  • Method for predicting permeability changes of rock massed covering working face under the condition of mining-induced influence
  • Method for predicting permeability changes of rock massed covering working face under the condition of mining-induced influence

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Embodiment Construction

[0043] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0044] The prediction method of the permeability change of the overlying rock mass on the working face under the influence of mining, such as figure 2 As shown, the specific process is as follows.

[0045] Firstly, divide the overlying strata uniformly in a limited manner, and at the same time carry out the layer numbering of 1, 2,..., n from the overlying strata to the surface layer, such as image 3 shown.

[0046] The movement influence function of the rock layer is defined in the order from the first layer of rock layer (direct roof) up to the nth layer of the ground surface. The influence function given in the background technology is still used to describe the deformation of the rock formation, but the calculation parameters need to be corrected, and the revised influence function formula for calculating the settlement of the rock ...

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Abstract

The invention discloses a method for predicting permeability changes of rock masses covering a working face under the condition of mining-induced influence. An influence function based rock strata movement model is utilized to calculate movements of stratified rock masses after coal mining, then the strain of response to the horizontal and vertical directions of the rock masses is obtained on the basis, a set of complete 'strain-porosity-permeability' relation model is obtained by establishing a strain and permeability relation, and the permeability distribution law of mined covering rocks is researched. The defects existing in a traditional rock mass permeability change prediction method are overcome, and the problems such as gas extraction and formation water flowing can be further analyzed.

Description

technical field [0001] The invention belongs to the technical field of mining, and in particular relates to a method for predicting the permeability change of the overlying rock mass on the working face under the influence of mining. Background technique [0002] Mining mining leads to the subsidence and movement of the overlying rock strata and the surface, which has a huge impact on the environment, construction, production and other activities. Especially, the rock strata and surface movement caused by large-scale and high-intensity mining are the root causes of mining area subsidence disasters and regional deformation. Therefore, the qualitative and quantitative analysis of the subsidence of the surface and overlying rock is not only of great significance to the protection of the surface environment and the safety of buildings, but also the prediction of the deformation and movement characteristics inside the rock strata in advance is of great significance to the safe pro...

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Application Information

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IPC IPC(8): G06F17/50G06Q50/02G06F17/11
CPCG06F17/11G06F30/20G06Q50/02
Inventor 程健维赵刚雷亚东李思远刘方远
Owner CHINA UNIV OF MINING & TECH
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