Permeability measurement device and measurement method in rock rheological process
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A technology of measuring device and rock, applied in the direction of measuring device, permeability/surface area analysis, suspension and porous material analysis, etc.
Inactive Publication Date: 2013-05-01
HOHAI UNIV
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Problems solved by technology
The on-site test of permeability coefficient is complicated, the test period is long and the economic consumption is large
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Embodiment 1
[0041] 1) This example is to measure the permeability coefficient in the rheological process of sandstone. First, a test rock sample with a diameter of 50 mm and a height of 100 mm is made according to the standard, and the rock sample is saturated with a vacuum saturation device and loaded into a triaxial pressure chamber;
[0042]2) Apply the confining pressure to the predetermined value of 2MPa, and keep the confining pressure unchanged;
[0043] 3) After the confining pressure is stable, apply the water inlet pressure to 1MPa, the water outlet is in contact with the atmosphere, and keep the water inlet pressure unchanged;
[0044] 4) After stable seepage flows out of the water outlet, apply the deviatoric stress value, and conduct the rheological experiment under the action of the first-level deviatoric stress, and the predetermined rheological time is 48 hours.
[0045] 5) Close the water outlet valve, load the water inlet pressure to 1.5MPa instantaneously, close the wat...
Embodiment 2
[0049] 1) This example is to measure the permeability coefficient in the rheological process of granite. First, a test rock sample with a diameter of 50 mm and a height of 100 mm is made according to the standard, and the rock sample is saturated by a vacuum saturation device and loaded into a triaxial pressure chamber;
[0050] 2) Apply the confining pressure to the predetermined value of 2MPa, and keep the confining pressure unchanged;
[0051] 3) After the confining pressure is stable, apply the water inlet pressure to 1MPa, the water outlet is in contact with the atmosphere, and keep the water inlet pressure unchanged;
[0052] 4) After stable seepage flows out of the water outlet, apply the deviatoric stress value, and conduct the rheological experiment under the action of the first-level deviatoric stress, and the predetermined rheological time is 48 hours.
[0053] 5) Close the water outlet valve, load the water inlet pressure to 1.5MPa instantaneously, close the water ...
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Abstract
The invention relates to a novel measurement method for permeability coefficients in a rock rheological process. A shaft pressure loading system is connected with a shaft pressure room of a three-shaft pressure room; a confining pressure loading system is connected with a confining pressure room of the three-shaft pressure room; a seepage control system is connected with a liquid emission system; samples are in parallel connection with the seepage control system and the liquid emission system; a computer data acquisition system is connected with the shaft pressure loading system, the confining pressure loading system and the seepage control system respectively; the device further comprises an upper water storage tank and a lower water storage tank; and the upper water storage tank and the lower water storage tank are connected between the seepage control system and the liquid emission system respectively. The measurement method can measure the permeability coefficients in all phases of the rock rheological process under different confining pressures and different deviatoric stress levels. According to the comparison between experimental results of the permeability coefficients in various phases of the rock rheological process and other conventional test methods, the reliability and the effectiveness of the method can be estimated. Compared with the traditional measurement method, the method overcomes the defects of long test process and complex test operation, and has the advantages of short test process, simplicity and convenience in operation and the like.
Description
technical field [0001] The present invention relates to a new measuring method of permeability coefficient in the rheological process of rock, in particular to a test method for obtaining the rock permeability coefficient through the graphing method by recording the relationship between upstream and downstream pressure difference and time at different times . Background technique [0002] In modern geotechnical engineering, rock permeability coefficient is a very important technical parameter, especially in water conservancy and hydropower projects, underground oil storage and nuclear waste underground storage projects. The current methods for determining the rock permeability coefficient mainly focus on the flow method under static water conditions. However, due to the complex environment of the rock material, the rock material is rich in various defects during its long formation process, including microcracks, pores and joints. The existence of macro discontinuous surface...
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