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Floor rock mass permeability coefficient test simulation method

A technology of permeability coefficient and simulation method, which is applied in the field of test and simulation of floor rock mass permeability coefficient, and can solve the problems that numerical simulation cannot reflect the site conditions well and the workload is heavy

Active Publication Date: 2016-06-29
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the complex site conditions and heavy workload, numerical simulation cannot reflect the site conditions well to a certain extent. Therefore, in practice, a device is needed to simulate the permeability coefficient, and to explore the relevant influencing factors and relationships of the permeability coefficient.

Method used

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  • Floor rock mass permeability coefficient test simulation method
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  • Floor rock mass permeability coefficient test simulation method

Examples

Experimental program
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Effect test

Embodiment 1

[0066] Example 1: Set the length of the test probe (that is, the length of the water injection section L) to 0.8 m, the plugging pressure to 2.0 MPa, the water injection pressure P to be 0.1 MPa, and the flow coefficient A to be 1.5, and the flow rate is carried out for the boreholes with the size of the cracks set in turn. Assay:

[0067] The first section (0-1m): the flow rate Q is 0.4L / min, and the corresponding permeability coefficient is 7.5m / d;

[0068] The second section (1-2m): the flow rate Q is 1.2L / min, and the corresponding permeability coefficient is 22.5m / d;

[0069] The third section (2-3m): the flow rate Q is 0.5L / min, and the corresponding permeability coefficient is 9.375m / d;

[0070] The fourth section (3-4m): the flow rate Q is 0.3L / min, and the corresponding permeability coefficient is 5.625m / d;

[0071] The fifth section (4-5m): the flow rate Q is 0.8L / min, and the corresponding permeability coefficient is 15m / d.

[0072] This example is only an illust...

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Abstract

The invention discloses a floor rock mass permeability coefficient test simulation method and belongs to the technical field of rock mass permeability coefficient determination. According to the method, firstly, a supporting positioning system is adjusted to reach an angle required for a test, and a fracture switch is adjusted according to drilling fracture requirements; secondly, the joint between a first water injection pipe and a second water injection pipe is adjusted according to the length required for the test; a blocking observation system is installed and comprises a simulated drilled hole, the fracture switch and a test probe, the fracture switch is located in the circumferential direction of the simulated drilled hole, and the test probe is located in the simulated drilled hole and comprises the water injection pipes, a blocking capsule, a capsule connecting pipe and a clamping groove connector; lastly, the blocking effect is checked, relevant parameters are acquired, and the permeability coefficient is calculated according to a formula. Compared with the prior art, the method has the advantages that drilling states under different fractures, different angles, different water injection section lengths and different water pressures can be simulated, the amount of water injected in the hole and leaked from a fracture within unit time can be measured, and therefore the permeability coefficient of a floor rock stratum can be measured and calculated.

Description

technical field [0001] The invention relates to the technical field of rock mass permeability coefficient determination, in particular to a method for testing and simulating the permeability coefficient of a rock mass of a floor. Background technique [0002] The permeability coefficient of rock mass is an important parameter reflecting the permeability of fractured rock mass, and the change of the permeability of rock mass in the floor is closely related to the damage of the floor. Therefore, it is of great significance to study the relationship between the permeability coefficient of the floor rock mass and the size of the fissure, the amount of water injection, the length of the water injection section and the water injection pressure. At present, numerical simulation, field measurement and other means are usually used to calculate the permeability coefficient. Due to the complex site conditions and heavy workload, and the numerical simulation cannot reflect the site sit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/082
Inventor 刘音赵春波张升堂路遥张景洲刘元臣李金平
Owner SHANDONG UNIV OF SCI & TECH
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