Large-scale cyclic simple shear test apparatus

Abstract

The invention relates to a large-scale cyclic simple shear test apparatus. The apparatus comprises a base. A column and a top beam are arranged on the base. A vertical pressurized oil cylinder and a loading top plate are arranged on the bottom of the top beam. One end of the base is provided with a horizontal counterforce bracket, which is connected to a horizontal pressurized oil cylinder. A loading bottom plate is arranged on the push rod of the horizontal pressurized oil cylinder. A soil bearing box is formed by laminating a plurality of constraining steel rings. The external side of each constraining steel ring is provided with a support lug. The upper surface and lower surface of each support lug are both covered by a layer of rubber gasket. The provided large-scale cyclic simple shear test apparatus can carry out simulation tests of large-size rock samples.

Description

technical field [0001] The invention relates to a large-scale cycle single shear device used for testing rock and soil medium dynamic characteristic parameters, and relates to the technical field of rock and soil testing. Background technique [0002] Under the action of dynamic cyclic loads (earthquake, wave, traffic), rock and soil show hysteresis and nonlinear characteristics. Usually, dynamic shear modulus and damping ratio are used to express this dynamic characteristic. Dynamic shear modulus and damping ratio It is a necessary parameter for dynamic response analysis of rock and soil mass. The test methods for testing the dynamic properties of soil include resonance column test, dynamic triaxial test and cyclic single shear test. Resonant column test for test 10 -6 ~10 -4 Dynamic properties in the strain range, dynamic triaxial and cyclic simple shear tests are available for test 10 -3 ~10 -1 Dynamic properties in the strain range. [0003] Cyclic simple shear equ...

AI Technical Summary

Problems solved by technology

In conclusion, existing studies have shown that in conventional cyclic simple shear tests, the stress-strain state of the specimen is complex and uncertain.

[0006] It is difficult to avoid the following defects in the conventional cyclic simple shear test: ① The sample size is small (maximum diameter ≤ 70mm, height ≤ 30mm), the soil sample is easily affected by sampling defects and soil heterogeneity, and the representativeness of the test results is difficult to guarantee; ② Due to the If the sample size is small, the influence of stress concentration and stress inhomogeneity inherent in the test method is more significant; ③ Due to the small sample size, it is impossible to conduct research on soil types that actually need to be studied in engineering, such as coarse-grained soil, reinforced soil, gravel, and slag. Tested, limited range of application

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