Coal rheology seepage flow test device

Abstract

A rheological and seepage test device of coal and rock is used for rheological test and seepage test in rheological process for coal and medium-soft rocks. The device is characterized in that a centering device is arranged in a pressure chamber of a rheological test device; the centering device includes an upper centering disk and a lower centering disk, which are connected with each other through a positioning screw; round holes are respectively provided at the centers of the upper centering disk and the lower centering disk; an upper pressing block and a lower pressing block are respectively arranged in the round holes of the upper centering disk and the lower centering disk; gaskets are provided between any two of the upper pressing block, the lower pressing block and a rubber sheath; a first air channel penetrating through the gasket vertically is provided on the gasket; and the gasket is connected with the rubber sheath and the end portion of corresponding pressing block at both ends. By arranging the centering device in the pressure chamber of the rheological test device, the invention can prevent the coal sample from being damaged by rocking, thus greatly improving the survive rate and the stability of the coal sample. Accordingly, the test data measured by the invention is more reliable in comparison with the prior rheological test device.

Description

technical field [0001] The invention relates to a rheological test device, in particular to a coal rock rheological seepage test device used for the rheological mechanics test of coal and medium-soft rock and the seepage test in the rheological process. Background technique [0002] Rheological properties are one of the important mechanical properties of rock and soil materials, which have a great influence on the long-term strength of rock and soil materials. At present, extensive research work has been carried out on the rheological properties of geotechnical materials at home and abroad. From laboratory experiments to engineering analysis, from empirical formulas to theoretical models, some beneficial results have been obtained. As a kind of geotechnical material, coal rock also has obvious rheological properties. A large number of field examples show that the delayed outburst of coal and gas is related to the rheological properties of gas-containing coal. [0003] Acc...

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Problems solved by technology

When the device loads and unloads coal samples, the briquetting block and the base pad are first connected and sealed through rubber sleeves and then put into the pressure chamber, and then the upper seat is fastened. This process can easily damage the coal sample and cause the test results to change. It is very unreliable; secondly, the gas pressure of the device is low (less than 2MPa), which cannot meet the field test conditions; in addition, the current various triaxial rheometers cannot measure the circumferential deformation of the sample inside the pressure chamber. Axial deflection can only be measured with external test equipment

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