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Seam wave airy phase identification tectonic coal method based on transmission method

A technology of tectonic coal and transmission method, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as the difficulty of predicting the distribution of tectonic coal

Active Publication Date: 2018-12-04
HENAN POLYTECHNIC UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for discriminating structural coal based on transmission method trough Poeri facies, so as to solve the problem that the distribution of structural coal is difficult to predict in coal mining

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  • Seam wave airy phase identification tectonic coal method based on transmission method
  • Seam wave airy phase identification tectonic coal method based on transmission method
  • Seam wave airy phase identification tectonic coal method based on transmission method

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Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0027] The first step is to determine the group velocity dispersion equation of the slot wave. For the rock-coal-rock three-layer symmetry model, the periodic velocity equation of the channel wave phase is:

[0028]

[0029] Where ω is the circular frequency, d is the coal thickness, c is the phase velocity of Love channel wave, v s1 and v s2 are the shear wave velocities of surrounding rock and coal seam respectively, and v s2 s1 , μ 1 and μ 2 are the shear moduli of surrounding rock and coal seam, respectively, and n is the dispersion order.

[0030] Since ω=2πf=kc, where f is the channel wave frequency, ρ 1 is the surrounding rock density, ρ 2 is the coal seam density, so formula (1) can be written as:

[0031]

[0032] Since the energy of the channel wave is mainly concentrated near the maximum value of the amplitude, the group velocity is...

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Abstract

The invention relates to the field of coal mine gas safety and provides a seam wave airy phase identification tectonic coal method based on a transmission method. According to a seam wave group velocity frequency propagation equation, a relationship between an airy phase velocity and a coal seam shear wave velocity is fitted out through utilization of the airy phase velocity obtained from inversion and combinations with coal seam and surrounding rock velocity parameters. When a surrounding rock shear wave velocity is constant, the airy phase velocity is proportional to the coal seam shear wavevelocity, coal beam shear wave velocity distribution can be obtained, and then tectonic coal distribution can be predicted.

Description

technical field [0001] The invention relates to the field of coal mine gas safety, in particular to a method for discriminating tectonic coal based on the transmission method of trough Poeri phase. Background technique [0002] The complexity of the geological structure of domestic coal mines has led to the widespread development of tectonic coal, leading to serious coal and gas outburst disasters in current coal mining. Therefore, finding an effective and feasible technology to judge the distribution of tectonic coal is a practical problem that needs to be solved urgently in the process of coal exploration. . There are many kinds of structural coal detection methods. In the 1980s, geological indicators, microscopic components, regional tectonic movements, and structural stress distribution were used to qualitatively analyze the distribution characteristics of structural coal; after the 1990s, the distribution of structural coal The detection has gradually deepened from qua...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/624
Inventor 冯磊杜艳艳杨振威张玉贵
Owner HENAN POLYTECHNIC UNIV
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