A Real-time Accurate Measurement Device of Specimen Volume Change in Ultra-Large Triaxial Test

Abstract

The invention relates to a real-time precision measurement device of the volume change of a test sample in an ultralarge triaxial test, and belongs to the technical field of the test of the mechanical engineering. The real-time precision measurement device is characterized by comprising a servo motor, an electric cylinder, a water guide trough, a water discharging barrel, a slender glass measuring pipe B, a right pressure difference sensor, a slender glass measurement pipe A, a left pressure difference sensor, a counterweight plate and the like. The height of the water guide trough on the water discharging barrel is precisely controlled by the servo motor according to the real-time height of the test sample, and the height of a water discharging opening is ensured to be equal to the height of the middle part of the test sample. The counterweight plate plays a role in balancing the weight of a glass pipe supporting plate, the slender glass measurement pipe B and the slender glass measurement pipe A, and the water discharging barrel is ensured not to incline. The slender glass measurement pipe A and the slender glass measurement pipe B are controlled by an electromagnetic valve to alternately charge water / discharge water, so that the continuous high-precision measurement on the ultralarge water displacement of the test sample can be realized. The real-time precision measurement device has beneficial effects that the structure is ingenious, the layout is reasonable, the measurement precision is high, the problem of the continuous high-precision measurement on the water displacement can be solved, and the popularization value is good.

Description

technical field [0001] The invention belongs to the technical field of mechanical engineering testing, and relates to soil mechanics triaxial tests, in particular to a device for detecting the volume change (displacement) of a sample during an ultra-large triaxial test. Background technique [0002] To measure the strength and deformation of soils, triaxial testers are often used, which are widely used and can be used to measure a variety of parameters, including shear strength and deformation properties, consolidation characteristics and soil permeability. Its main functional equipment includes the control of the principal stress, the measurement of volume change (displacement) and pore pressure. The ultra-large triaxial tester is mainly aimed at completing large confining pressure and heavy load tests on ultra-large samples (cylindrical samples with a diameter of 1.0 meters and a height of 2.0 meters), testing the strength and deformation characteristics of super-large sam...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a device for continuous and high-precision measurement of large displacement to solve the problem of accurately measuring the volume change of the sample according to the displacement in super-large triaxial tests

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