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Calculation method of three-dimensional permeability tensor

A technology of seepage tensor and calculation method, which is applied in calculation, special data processing applications, instruments, etc., and can solve the problem of heavy calculation workload of seepage

Active Publication Date: 2015-12-09
CENT SOUTH UNIV
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Problems solved by technology

[0006] In order to solve the technical problem that the calculation workload of seepage in fractured rock mass is too large in the current three-dimensional situation, the present invention provides a three-dimensional seepage tensor calculation method that can effectively improve the calculation efficiency of effective fractures

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  • Calculation method of three-dimensional permeability tensor

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specific Embodiment

[0061] There are mainly 4 groups of cracks developed on a certain slope, and the specific occurrences are as follows:

[0062] Group 1: bedding surface, concentrated occurrence: N45°W, NE∠11°, basically connected through the west side, the extension length is more than 20m, the development interval is about 0.5m, and the width is 0.2mm-1.0mm;

[0063] The concentrated occurrence of the second group: N20°E, NW∠82°, except for the interlayer structural plane, the structural plane of this group is the most developed, the development interval is 0.4m-1.0m, and the development length is 15m-30m, showing the characteristics of tension and torsion , more than 0.5mm to 1.5mm open, and a few of them develop melting grooves at the intersection with the interlayer structural plane;

[0064] Group 3 concentrated occurrence: N41°W, NE∠53°, mainly developed on the east side slope, with a distance of 0.4m to 1.0m, a length of 5m to 10m, and an extension of 0.4mm to 1.2mm;

[0065] Group 4 c...

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Abstract

The invention discloses a calculation method of a three-dimensional permeability tensor. According to the calculation method, on the basis of an analysis of two-dimensional fracture network permeability, a two-dimensional cross-section is rotated along a certain axle; penetration coefficients of the two-dimensional cross-section in each direction under different rotation angles are calculated; an elliptical sphere is drawn; and the three-dimensional permeability tensor is approximated with a regression analysis. As a one-dimensional line unit is used for simulating a fracture in the two-dimensional fracture network permeability calculation, complicated fracture processing work in a three-dimensional fracture network model is effectively avoided. When the fracture is calculated, dimensions of the equation are reduced from three dimensions to two dimensions, so that the number of the calculation and efficiency of the effective fracture are greatly improved.

Description

technical field [0001] The invention relates to a three-dimensional permeability tensor calculation method. Background technique [0002] Classical seepage theory is based on the assumption of continuous media, but in reality, most media are discrete. In order to apply discrete media to classical percolation theory, the concept of representational volume (REV) is introduced, so that the actually discrete porous medium is equivalent to a continuous medium composed of representational volumes. When the size of the characterizing unit is small compared with the size of the research area, the continuum seepage theory can be used for analysis. For porous media such as soil, the characterization unit is very small, and the continuum seepage theory can be directly applied. For the rock mass, since there are usually various joints and fissures in the rock mass, when the fluid flows through the rock mass, it mainly passes through the fissures. There are two main differences betwee...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 雷金山刘正夫杨秀竹叶志凌康镜
Owner CENT SOUTH UNIV
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