Unsaturated soil slope apparatus for measuring deformation and suction of soil, and operating method thereof

Abstract

The invention relates to the technical filed of geotechnical direct shearing apparatuses, and discloses an unsaturated soil slope apparatus for measuring the deformation and suction of soil. The apparatus comprises a slope model case, a data acquisition structure and an environment simulation structure; the upper end of the slope model case is oblique, one sidewall of the slope model case is transparent, and the transparent sidewall is provided with a plurality of index points; the environment simulation structure comprises a water spray structure and a drying structure; and the data acquisition structure comprises a camera and a suction sensor, the camera is arranged outside the transparent sidewall, and the suction sensor is inserted into the slope model case. In a cavity for accommodating unsaturated soil, wet-dry cycle simulation of the water spray structure and the drying structure is carried out, the camera acquires the deformation of unsaturated soil to measure macroscopic mechanical properties, the suction sensor acquires the suction data of the unsaturated soil to measure microscopic mechanical properties, and the apparatus is of great significance for the advanced researches of the mechanic characteristics of water and soil of the unsaturated soil slope under natural conditions and the stability under rain dry-wet cycle.

Description

technical field [0001] The invention relates to the technical field of unsaturated soil deformation and suction measurement, in particular to an unsaturated soil slope device for measuring soil deformation and suction and an operating method thereof. Background technique [0002] The failure form of soil is mainly caused by shear failure, so the accurate determination of shear strength parameters of soil is of great significance in geotechnical engineering. [0003] In the prior art, the shear strength parameters of the soil are measured in the laboratory, and a direct shear instrument is generally used for a shear test. Under vertical pressure, a horizontal force is applied to the soil for shearing, so as to obtain the shear strength of the soil when it is damaged. Shear stress, and then according to Coulomb's law to determine the soil shear strength parameters, internal friction angle and cohesion and other parameters. [0004] However, in nature and practical engineering...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a visual geotechnical direct shear device, aiming to solve the problem that the direct shear test in the prior art cannot simultaneously perform combined measurement of macroscopic and microscopic mechanical properties of unsaturated soil

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