Lateral deformation measuring device of plane strain triaxial rheometer

Abstract

The invention discloses a lateral deformation measuring device of a plane strain triaxial rheometer. The device comprises rigid plates, an elastic water sac, a piston rod and sealing assemblies. The rigid plates compose a sample box with an accommodating space, wherein a front rigid plate and a back rigid plate are respectively provided with a water sac accommodating part, a water inflow and outflow port, and a piston rod through hole. The piston rod passes through the inner membrane and outer membrane of the elastic water sac and the piston rod through holes. The sealing assemblies are disposed at the joints of the piston rod, the inner membrane and the outer membrane. The invention has the advantages that: the device is suitable for unsaturated soil; lateral deformation data and axial deformation data are mutually independent, thus facilitating observation of the deformation law of a sample from different directions; the lateral deformation data is not affected by the volume deformation measurement result, and mutual proofreading can be carried out according to a theoretical relationship, thus being convenient for discrimination of test data ambiguous points; and a lateral deformation development process of the sample during the test can be directly observed.

Description

technical field [0001] The invention relates to geotechnical engineering testing equipment technology, in particular to a lateral deformation measuring device of a plane strain triaxial instrument pressurized by a water bag. Background technique [0002] figure 1 It is a sample of plane strain triaxial test, and its length, width and height are 100mm, 50mm, and 100mm. Such as figure 2 As shown, the sample box of the plane strain triaxial instrument is composed of 6 aluminum alloy plates, and the upper and lower are two axially pressurized rigid plates 12; the left and right two in the horizontal direction are rigid limit plates 11, which can measure pressure; The pressure is applied through the pressure rigid plate 14 in the front and rear directions, and different types of instruments have different pressure methods. During the test, there is deformation in the height direction and width direction; there is no deformation in the length direction limited by the rigid pla...

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Problems solved by technology

[0004] However, the above method has the following disadvantages: the method can only be used when the sample is completely saturated; the measurement error of the axial deformation will be transmitted to the lateral deformation; when the sample has abnormal moisture loss, the volume measured by this method The deformation is small; the development process of the lateral deformation cannot be directly observed during the test

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