Multifunctional calibration device for miniature earth pressure box

Abstract

The invention relates to a multifunctional calibration device for a miniature earth pressure box, which comprises a multifunctional bottom plate, a reaction frame vertical column arranged on the multifunctional bottom plate, a reaction frame top beam arranged on the reaction frame vertical column, a pressure sensor arranged below the reaction frame top beam, a hydraulic jack arranged below the pressure sensor, a loading piece arranged below the hydraulic jack and multiple calibration cylinders with diameters from small to large, wherein the reaction frame vertical column is provided with a connection structure for fixing the reaction frame top beam at different positions on the reaction frame vertical column. According to the multifunctional calibration device for the miniature earth pressure box of the invention, earth calibration tests can be carried out on the same miniature earth pressure box in calibration cylinders with different diameters, a different pressure can be loaded in a graded mode through the hydraulic jack in each earth calibration test, influences on the earth calibration test data by calibration cylinders with different diameters and the influence size and the trend are obtained, and the problem that the earth calibration test device calibration coefficient designed by a technician is increased randomly can be avoided.

Description

technical field [0001] The invention relates to an indoor model test device, in particular to a calibration device for measuring calibration coefficients of miniature earth pressure cells in soil media. Background technique [0002] The measurement of earth pressure is often encountered in indoor model tests. Miniature earth pressure cells are often used to measure the size and distribution of earth pressure in the soil medium of model tests. Most of the miniature earth pressure cells available on the market use the method of oil standard or gas standard to determine the calibration coefficient. However, a large number of indoor model tests show that the earth pressure cell will produce obvious stress concentration and soil arching effect in the soil medium, so that its calibration coefficient in the soil medium will have a large difference from the oil standard or gas standard , resulting in the authenticity and accuracy of model test data cannot be guaranteed. Therefore,...

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Problems solved by technology

Therefore, technicians hope to test the calibration coefficients of the miniature earth pressure cell through calibration cylinders with different diameters, different filling thicknesses above and below the miniature earth pressure cell in the calibration cylinder, and materials of different properties around the micro earth pressure cell, in order to obtain the above-mentioned The impact of different factors on the calibration coefficient of the miniature earth pressure cell is used to guide the design of the indoor soil standard test device and the indoor soil standard test, so as to solve the existing devices for the indoor soil standard test of the miniature earth pressure cell in the prior art In the design, there is a lot of randomness, and there is no standard test device and test method, which leads to an increase in the randomness of the calibration coefficient, and there are large differences in the calibration coefficient of the same earth pressure cell under different equipment and operators.

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