A device for measuring volume change in triaxial test

Abstract

The invention discloses a device used for measuring a triaxial test volume change. A measuring load and a vapor pressure chamber are respectively suspended at two ends of a balance beamn; a liquid bin of the vapor pressure chamber is connected with a triaxial pressure chamber; and an air bin is connected with an air source. The measuring method comprises the following steps: measuring a volume change of a sample in the triaxial pressure chamber through weight of water entering the triaxial pressure chamber in the vapor pressure chamber; weighing the weight of the water entering the triaxial pressure chamber in the vapor pressure chamber by using a balance; calculating the balance weighing accuracy and the volume change of the sample in the triaxial pressure chamber through a liquid level pipe, so that error and repeated weighing can be avoided; avoiding sudden great swing of the beam through a protection device, protecting the balance, and protecting the vapor pressure chamber and the triaxial pressure chamber; and conveniently reading the gravity change through a load sensor and an electronic scale. The device disclosed by the invention is simple in structure, high in measurement accuracy and convenient to operate, the triaxial test requirement can be met, and the actual volume change measurement accuracy can reach 0.1cm<3> or even lower.

Description

technical field [0001] The invention relates to a measuring device, in particular to a device for measuring the body deformation of a triaxial test. Background technique [0002] Triaxial test is the most commonly used test method to study the strength and deformation characteristics of rock and soil. Axial strain and volume change of the specimen under different stress states until shear failure of the specimen. [0003] For saturated soil, the volume change is generally measured by measuring the volume change of the water body in the sample. However, due to the limitation of indoor test methods, it is often difficult to achieve an ideal saturation state, and a certain amount of gas is often retained in the sample. , resulting in the discontinuity of the volume change curve of the triaxial test or a relatively large deviation from the real volume change, which affects the accuracy of the volume change measurement of the triaxial sample. [0004] For unsaturated soil and g...

AI Technical Summary

Problems solved by technology

[0003] For saturated soil, the volume change is generally measured by measuring the volume change of the water body in the sample. However, due to the limitation of indoor test methods, it is often difficult to achieve an ideal saturation state, and a certain amount of gas is often retained in the sample. , resulting in the discontinuity of the volume change curve of the triaxial test or a relatively large deviation from the real volume change, which affects the accuracy of the volume change measurement of the triaxial sample

[0004] For unsaturated soil and general rock mass, it is often used to measure the change of the radial radius on the typical section of the sample to calculate the volume change of the sample, because the change of the radial radius of each section of the sample is uneven and the sample There is a large difference in radial radius change between the end and the middle of the sample. Therefore, the method of measuring the radial deformation of a typical section also has defects, and cannot reflect the real volume change during the triaxial test.

Images