Unsaturated soil tester for testing deformation of soil sample of clay in real time

Abstract

The invention discloses an unsaturated soil tester for testing deformation of a soil sample of a clay in real time, which belongs to the technical field of manufacturing of geotechnical engineering measuring instruments. The tester comprises a combined pressure chamber, wherein the combined pressure chamber is provided with a bidirectional moving uploading pressure piston, a sidewall of the combined pressure chamber is transparent, and top of the pressure chamber is provided with an air intake; a strengthening component is arranged at an external side of a transparent sleeve, a clay plate is embedded in a submerged groove at a base of the pressure chamber, and the base is provided with a water inlet and a water outlet; a piston head contacted with the soil sample is an end support plate, the other end of a piston rod is connected with an uploading plate, and the uploading plate is provided with a displacement meter; additionally, the tester further comprises a laser measurement device arranged at the external side of the transparent sleeve, and the laser measurement device is used for measuring the lateral deformation of the soil sample filled in the pressure chamber in real time. The tester can accurately test the lateral deformation and the vertical deformation of the clay in a drying process and a humidifying process, so that a soil water characteristic curve of the soil sample of the clay under a dry-humid circulation state can be obtained. The tester is excellent in test accuracy, simple in structure, convenient to operate and easy to control.

Description

technical field [0001] The invention relates to a geotechnical engineering measurement device, in particular to an unsaturated soil test device for real-time measurement of clay soil sample body deformation, and belongs to the technical field of geotechnical engineering measurement instrument manufacturing. Background technique [0002] Unsaturated soils such as fine-grained soil, collapsible soil and expansive soil are widely used as engineering materials in roadbeds, foundations, retaining walls, landfills, nuclear waste deep geological disposal and other engineering fields. After these engineering materials are subjected to external loads, precipitation infiltration, and groundwater capillary action, their physical and engineering properties, especially soil-water characteristics, will change. At the same time, in the simulation of the stress-strain relationship of unsaturated soil, the mechanical properties of unsaturated soil are not only affected by the matric suction ...

AI Technical Summary

Problems solved by technology

This process, after unloading and reloading, will produce certain experimental errors, so that the accurate relationship curve between saturation and suction cannot be obtained in real time. Application of saturated soil test device affected

In fact, the existing unsaturated soil test instruments are too complex in structure, high in design and manufacturing costs, and inconvenient to operate

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