Double-chamber determinator for volume frost-heaving ratio of frozen soil

Abstract

The invention discloses a double-chamber determinator for the volume frost-heaving ratio of frozen soil. The determinator comprises a heat-preserving chamber, a sample pipe, a heat-insulating seat, a sample container, a differential pressure transducer and a cold bath, wherein the sample pipe is provided with a water inlet pipe and is arranged in the heat-preserving chamber, the bottom pipe orifice of the sample pipe is hermetically connected with the heat-insulating seat, the sample container is arranged in the sample pipe and on the heat-insulating seat, one end of the differential pressure transducer is communicated with the sample pipe through a water guiding pipe, the other end of the differential pressure transducer is connected with a reference water pipe, the cold bath is communicated with the heat-preserving chamber and the sample pipe, a cavity used for holding a to-be-determined sample is arranged in the sample container, and freezing liquid is arranged in the heat-preserving chamber and the sample pipe. According to the invention, the freezing liquid in the heat-preserving chamber and the sample pipe can be cooled by only opening the cold bath and setting a chilling temperature, so operation is easy and convenient; since a telescopic elastic rubber sleeve is wrapped over the sample, the sample can expand in three-dimensional space without restriction during freezing, so the accurate volume frost-heaving ratio of frozen soil can be obtained.

Description

technical field [0001] The invention relates to a geotechnical test instrument, in particular to a measuring instrument for frozen soil volume frost heave rate. Background technique [0002] During the process of soil freezing, the water in the soil, including the original pore water in the soil and the outside world, migrates to the freezing front, and the replenished water freezes into ice, and forms many ice interlayers and ice lenses, which cause the relative displacement of soil particles and soil expansion. , called freezing up. Frost heave is the characteristic value of soil frost heave, it is the scale to measure the size of frost heave deformation when the soil is frozen, and it is the most important and basic parameter in the study of soil frost heave. [0003] At present, the usual test instruments for determining the frost heave rate are composed of water supply devices, dial indicators, sample boxes, etc. The test process is to put the sample into the sample b...

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Problems solved by technology

However, since the deformation measured by the test method is the deformation in the vertical direction of the sample, under the condition that the radial deformation of the sample is limited, it is not acc

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