Anti-locking soil body frost heaving test sample tube

Abstract

The invention relates to the field of frozen soil physics test equipment, and provides an anti-locking soil body frost heaving test sample tube. The anti-locking soil body frost heaving test sample tube mainly comprises an outer tube body, an inner tube body, a fixing bolt and the like, and is characterized in that the inner tube body is composed of an inner tube upper structure, an inner tube middle structure and an inner tube lower structure; the lower structure is a tube ring I which is made of a PMMA material and is provided with a flat lower surface and a convex upper surface; bolt holesI are reserved in the bottom of the tube ring I; the middle structure is composed of a group of tube rings II which are made of the PMMA material and are provided with concave lower surfaces and convex upper surfaces; the upper structure is a tube ring III which is made of the PMMA material and is provided with a flat lower surface and a convex upper surface; bolt holes III are reserved in the topof the tube ring III; the inner tube upper structure, the inner tube middle structure and the inner tube lower structure connected into the inner tube body in a concave-convex buckled mode; the outertube body is a tube ring IV made of the PMMA material; bolt holes IV are reserved in the bottom of the top of the tube ring IV; and the outer tube body and the inner tube body are connected into a whole through fixing bolts. According to the anti-locking soil body frost heaving test sample tube, the locking phenomenon in a laterally-confined soil body frost heaving test can be effectively avoided, and the influence of the side friction force between a temperature sensor and a moisture sensor as well as the side friction force between a soil body and the sample tube on the data authenticity can be avoided.

Description

technical field [0001] The invention relates to the field of frozen soil frost heaving tests in physics of frozen soils, in particular to a sample cylinder used for limited soil frost heaving tests. Background technique [0002] In the civil engineering construction in permafrost areas, housing construction in seasonal frozen soil areas, and urban municipal construction, the application of artificial freezing method construction technology needs to consider the frost heave and thaw settlement of the foundation soil, and the impact of frost heave force on construction equipment. destructive ability. The problem of frost heave and thaw settlement affecting soil is mainly the phase change of water body under the comprehensive influence of temperature and water migration. This requires us to study the migration of water and heat in the soil during the freezing process. [0003] Soil freezing under on-site conditions can be simplified into a one-way or two-way freezing process ...

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Problems solved by technology

[0003] Soil freezing under on-site conditions can be simplified into a one-way or two-way freezing process with laterally limited displacement conditions. It is effective to conduct actual on-site measurements, but it is not conducive to pre-control of risks. Therefore, it is necessary for us to conduct indoor experiments. Most of the time, small sample tests are carried out, and the temperature and moisture sensors inserted in the test cylinder will limit the displacement of the soil, and the friction between the soil and the test cylinder wall (superimposed friction from top to bottom) will also inhibit the movement of the soil. The effect of frost heave, which leads to the lack of authenticity of the frost heave data measured by the test

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