Combined dynamic triaxial dynamic simple shear pressure chamber system capable of measuring radial strain of soil sample

Abstract

The invention discloses a combined dynamic triaxial dynamic simple shear pressure chamber system capable of measuring radial strain of a soil sample, and belongs to the geotechnical engineering test device technical field. The sample (8) is mounted in a water pressure chamber through sample cover bodies (6) having a drainage function; an axial loading system comprising an axial servo electrical controller (20), an axial piston rod (21), an axial pressure sensor (19) and an axial displacement sensor (2) applies an axial pressure on the top of the sample (8); a horizontal loading system comprising a horizontal servo electrical controller (17), a horizontal piston rod (13), a horizontal pressure sensor (15) and a horizontal displacement sensor (14) applies a horizontal shearing force on the bottom of the sample (8). On the basis of a conventional combined dynamic triaxial dynamic simple shear apparatus, the radial strain of the soil sample under action of the axial and horizontal load is measured simultaneously. Universality of the combined dynamic triaxial dynamic simple shear apparatus is improved, and measured data is accurate.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering testing equipment, and relates to a combined dynamic three-axis dynamic single-shear pressure chamber system capable of measuring radial strain of soil samples, including an axial loading system, a horizontal loading system, and a radial strain instrument and pressure chamber. Background technique [0002] The strength and deformation of soil is one of the important foundations of soil mechanics research. There are many kinds of experimental instruments and equipment for measuring the shear deformation strength of soil, including direct shear instrument, simple shear instrument, triaxial instrument, torsional shear instrument, plane strain instrument and true triaxial instrument. The traditional rock and soil simple shear instrument uses the method of combining multi-layered rings to apply confining pressure, and the soil sample is restrained by multi-layered rings to ensure that...

AI Technical Summary

Problems solved by technology

For example, when a cylindrical specimen is in a "sheared" state, the stacking ring cannot maintain a constant cross-sectional area

Due to the lack of a device to measure the radial strain of the test specimen, it is difficult to accurately calculate the stress distribution and stress path of the cylindrical specimen under the combined dynamic triaxial dynamic single shear load after the test

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