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Computer numerical simulation method with consideration of worked out section of caving zone

A numerical simulation and goaf technology, applied in calculation, 3D modeling, image data processing, etc., can solve problems such as limiting the guiding role of computer technology, and achieve the effect of ensuring reliability and reliable simulation data

Inactive Publication Date: 2018-04-20
TAIYUAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

There is no scientific simulation method for the numerical simulation technology of the goaf in the caving zone, which limits the guiding role of computer technology in the field of mining engineering

Method used

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  • Computer numerical simulation method with consideration of worked out section of caving zone
  • Computer numerical simulation method with consideration of worked out section of caving zone
  • Computer numerical simulation method with consideration of worked out section of caving zone

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Experimental program
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Embodiment Construction

[0051] A computer numerical simulation method considering caving zone gobs, comprising the following steps:

[0052] Step 1: Modeling. Modeling has a significant impact on calculation. It is recommended to use external modeling interface software, such as ansys, for modeling, which can create a randomly distributed grid model that FLAC3D itself cannot create, and the calculation is more reliable. Numerical models are established layer by layer based on drilling data and working face dimensions. The boundary conditions of the model are determined through in-situ stress tests. figure 2 Shown is a FLAC 3D model.

[0053] The second step: select the constitutive model of the rock mass material except the goaf, and determine the physical and mechanical parameters of each rock layer. An accurate constitutive model is the basis for reliable simulation results. The Hoek-Brown empirical strength criterion (hereinafter referred to as the H-B criterion) was obtained by Hoek E and Br...

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Abstract

The invention, which belongs to the technical field of computer numerical simulation of the compression response on a worked out section by an overlying rock after exploitation of the coal, particularly relates to a computer numerical simulation method with consideration of a worked out section of a caving zone. The method comprises: step one, carrying out modeling; step two, determining rock mechanics parameters except a worked out section; step three, assigning a worked out section material to a two-yield constitutive model; step four, determining relevant parameters of the worked out section material; and step five, substituting all rock mechanics and worked out section parameters into the model to carry out operation to obtain a numerical simulation result with consideration of a worked out section. According to the invention, the carving angle is considered into numerical simulation, so that the result is close to the practical situation. The worked out section is simulated by using the two-yield model, the parameters are determined based on iterative trial-and-error matching and Salamon stress-strain curve fitting, and the reliability of the simulation result is ensured basedon matching of laboratory test data and computer simulation data.

Description

technical field [0001] The invention belongs to the technical field of computer numerical simulation of the compression response of the overlying strata in the mined-out area after coal mining, and in particular relates to a computer numerical simulation method considering the goaf of a caving zone. Background technique [0002] The extraction of coal from the ground causes the overburden to move and stress to redistribute. Longwall mining is the main coal mining method in my country. After mining, a goaf is formed. The goaf is the product of coal mining in the stope, which has a great impact on the topography and landform. The response of the goaf has a significant impact on the migration of overlying rock. [0003] The key layer theory of strata movement, through experiments, theoretical research and field evidence, proves that the longwall mining overlying rock forms three zones, namely the collapse zone, fracture zone and curved subsidence zone. figure 1 It is shown as ...

Claims

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Application Information

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IPC IPC(8): G01V1/30G06F17/50G06T17/05
CPCG01V1/306G01V2210/624G01V2210/66G06F30/17G06T17/05
Inventor 王朋飞冯国瑞张玉江
Owner TAIYUAN UNIV OF TECH
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