Method for regulating and controlling water pressure of seepage flow water outlet end

A technology for water outlet and water outlet, which is applied in the direction of permeability/surface area analysis, measuring device, suspension and porous material analysis, etc. It can solve problems such as pipeline leakage, affecting test results, and low precision of differential pressure sensors. achieve low cost

Inactive Publication Date: 2008-07-23
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

This method is to test the permeability of rock samples according to the relationship between water pressure balance and time. It ignores the compressibility of the fluid in the rock sample and the pore compressibility of the rock (body), the deformation of the pipeline and the leakage of the pipeline. Moreover, the accuracy of the differential pressure sensor is relatively low, and the long test duration will inevitably affect the test results.
The water pressure at the seepage outlet is a variable, and the pore water pressure on the actual rock mass does not change with time, which is inconsistent with the actual pore water pressure on the rock sample. Testing of permeability and related mechanical properties of lower rock (body) under total stress and strain process

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  • Method for regulating and controlling water pressure of seepage flow water outlet end

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Embodiment Construction

[0011] Referring to Figure 1, the water pressure control method at the seepage outlet end, the method is to connect the pipeline filter 1 at the seepage outlet end of the sample, and the manual speed control valve 2 connected with the pipeline filter to regulate the flow rate at the seepage outlet end, so that Maintain a steady flow at the outlet. As long as the water pressure at the seepage inlet end is kept constant, when the seepage flow of the sample reaches a balance with the adjusted flow rate, a stable water pressure value can be generated at the seepage end, and then a stable water pressure difference can be formed at both ends of the sample. When the pressure difference and flow rate of seepage water remain unchanged, the permeability test in this period conforms to Darcy's law, and then the permeability index of rock mass under corresponding conditions can be obtained.

[0012] Figure 2 is the actual measurement results for a certain lithology sample, and the water o...

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Abstract

The invention relates to a water pressure regulation method at seepage water outlet end, which comprises connecting a pipe filter with a sample seepage water outlet end, using a speed-regulating valve connected with the pipe filter to regulate the flux of the seepage water outlet end in 0-10L/min to keep stable seepage quantity at the water outlet end. When the water pressure at the seepage inlet end is stable and the sample seepage is balance with the regulation flux, the effusion end generates stable water pressure and forms stable water pressure difference at two ends of the sample. When the seepage water pressure difference and the flux are stable, the permeability test in the time section meets darcy law to obtain the sample permeability index at relative conditions. The invention has low cost, which resolves the high-pore water pressure and low hydraulic gradient simulation test of project to provide reliable water pressure regulation method at seepage water outlet end for sample permeability and mechanical property research.

Description

Technical field: [0001] The invention is mainly used for rock (body) permeability and its permeability mechanical property test and damage mechanism research under the conditions of high pore water pressure and small hydraulic gradient, and particularly relates to a water pressure regulation method of seepage outlet water end. Background technique: [0002] According to the experimental principle, indoor permeability test methods can be divided into two categories: one is to apply a certain or changing water pressure difference at both ends of the test piece, and calculate the permeability coefficient of the test piece by measuring the seepage flow rate. The variable water level method belongs to this category; the other is to inject water at a certain flow rate or directly apply a pressure pulse to one end of the specimen, and calculate the permeability coefficient of the specimen by measuring the pressure difference between the two ends of the specimen over time. There are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 黄润秋徐德敏付小敏虞修竞
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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