Test method for coal matrix deformation mechanical parameters

A testing method and technology of mechanical parameters, applied in measuring devices, scientific instruments, suspension and porous material analysis, etc.

Active Publication Date: 2015-12-16
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

This test method ignores the influence of pore pressure or effective stress on the coal pore structure during gas flow.

Method used

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  • Test method for coal matrix deformation mechanical parameters
  • Test method for coal matrix deformation mechanical parameters
  • Test method for coal matrix deformation mechanical parameters

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Embodiment Construction

[0040] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. In this example, the Young's modulus of elasticity E in the direction perpendicular to the bedding direction is determined by uniaxial compression experiments. ⊥ =2.1GPa, Poisson's ratio ν perpendicular to the bedding direction ⊥ = 0.323.

[0041] like Figure 1-3 Shown, the coal matrix deformation mechanics parameter test method of the present invention, concrete test procedure is as follows:

[0042] The first step: processing and making coal sample test specimens

[0043] The whole coal block is processed into a cylindrical shape, the axial direction is perpendicular to the coal bedding direction, and the circumferential direction is parallel to the coal bedding direction; the axial strain gauge 4 is pasted on the outer surface of the cylindrical coal sample 11 along the axis; the coal sample 11 is inserted into t...

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Abstract

The invention discloses a test method for coal matrix deformation mechanical parameters. A coal sample test piece is placed into a closed clamping chamber body, a gas injection cavity and a gas outlet cavity are formed in two ends of a coal sample respectively, helium is guided into the gas injection cavity, the helium is firstly seeped into a coal fracture and then start to diffuse into a coal matrix, relations of a pressure value and a strain value as well as log time are drawn into graphs respectively, and a strain value and a fracture pore pressure value at the end of seepage and a strain value at the end of diffusion are obtained according to the graphs; finally, the coal matrix volume modulus in the seepage stage and the pore pressure variation in the matrix in the diffusion stage are calculated. A test method for deformation parameters of coal in all directions under the triaxial stress state condition is provided aiming at the high adsorption characteristic of coal-seam gas and considering the effect of pore pressure to a coal pore structure in the flowing process of gas and the effect of coal matrix deformation to permeability, and a new research means is provided for in-depth study of a coal-gas coupling problem.

Description

technical field [0001] The invention relates to a method for measuring mechanical parameters of coal, in particular to a deformation characteristic of a matrix block in a coal porous structure and a method for measuring the mechanical parameters thereof under triaxial stress conditions. Background technique [0002] Coal body deformation caused by gas migration is a key issue in the study of coalbed methane extraction, coal and gas outburst, and geological storage of greenhouse gases. Since coal reservoirs not only contain mutually orthogonal separation (fracture) systems, but also include micropores of various scales, this complex pore structure endows coal reservoirs with significantly different conduction characteristics from conventional natural gas reservoirs, mainly manifested in It is: (1) low permeability; (2) strong adsorption to methane and carbon dioxide; (3) desorption of adsorbed gas causes coal matrix to shrink. It is generally believed that coalbed gas migrat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 王春光翟培城蒋宇静刘继山魏明尧
Owner SHANDONG UNIV OF SCI & TECH
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