Compression-shear testing apparatus for rock in dry-wet cyclic process

Abstract

The invention belongs to the field of geotechnical engineering, and in particular relates to a compression-shear testing apparatus for a rock in a dry-wet cyclic process. The apparatus comprises an angle-variable compression-shear unit, and a compression machine for vertically applying load onto the angle-variable compression-shear unit; the apparatus also comprises a reservoir, water injection equipment for carrying out moisture saturation treatment on a rock sample in the angle-variable compression-shear unit, and heating equipment for carrying out hot-gas drying treatment on the rock sample in the angle-variable compression-shear unit. The angle-variable compression-shear unit is located in the reservoir, and the reservoir is communicated with the water injection equipment and the heating equipment. By adopting the compression-shear testing apparatus, the integration of rock sample dry-wet cyclic treatment and a shear test is realized, and the apparatus has the advantages of simple structure, convenient operation, low cost, wide application range and long service life; the rock samples in different states after different dry-wet cyclic times can be accurately simulated, shear test research is carried out on the rock samples, and moreover, failure load and displacement of the rock samples in the vertical direction in the shear test process can be recorded in real time.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, and in particular relates to a rock compression-shear test device in a dry-wet cycle process. Background technique [0002] Periodic changes in reservoir water level cause rock and soil to always be in a state of "dry-saturation". The engineering geological disasters caused by this have attracted the attention of many scholars and engineering circles. Hot Issues. The main manifestations of water-rock interaction are: the water-rock interaction changes the mineral composition, porosity, cement and its arrangement and combination of rock and soil, which causes rock damage and causes its strength (especially the shear strength parameters) to change. A large decrease will lead to the destruction of soft rock, and even cause the instability of the reservoir bank slope, which poses a threat to the long-term stability of geotechnical engineering. [0003] Common indoor test methods for determin...

AI Technical Summary

Problems solved by technology

However, at present, the experimental research on the influence of dry-wet cycle on the mechanical properties (shear strength) of rock has the disadvantages of complex test equipment, cumbersome operation and high cost, and there are few instruments for simulating the shear test of rock in dry-wet cycle.

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