Expansibility parameter in-situ testing device for expansive soil

Abstract

The invention belongs to the field of soil layer measurement, and discloses an expansibility parameter in-situ testing device for expansive soil. The device comprises an upper top tray, a plurality ofwater injection pipes, a counter-force tray and a plurality of displacement meters. A plurality of water injection pipe mounting holes are formed in the upper top tray; one end of each water injection pipe is connected with the corresponding water injection pipe mounting hole, and a plurality of water injection holes are formed in the side wall of the other end; one end, connected with the corresponding water injection pipe mounting hole, of each water injection pipe is open; one ends of the displacement meters are connected with the counter-force disc, and the other ends are connected with the upper top tray. The upper top tray and the plurality of water injection pipes are arranged, the testing device is fixed in an in-situ expansive soil layer through the plurality of water injection pipes, during water injection, due to soil layer expansion, the water injection pipes play a good anchoring role, meanwhile, the counter-force tray is attached to the surface of the expansive soil layer, the expansion amount of the expansive soil layer is represented by measuring the displacement amount of the counter-force tray, in-situ measurement of expansibility parameters of the expansive soillayer is achieved, and the measured value is close to the actual situation as much as possible.

Description

technical field [0001] The invention belongs to the field of soil layer measurement and relates to an in-situ testing device for expansive soil expansibility parameters. Background technique [0002] Atmospheric influence depth refers to the effective depth of soil deformation caused by precipitation, evaporation, ground temperature and other factors under the action of natural climate. The expansive soil layer in this range is easily affected by the environment and has a greater impact on the project. Therefore, it is very important to clarify the expansive parameters of the expansive soil layer within the depth of atmospheric influence for the design of building structures. At present, the expansibility parameters of the expansive soil layer are basically carried out in the laboratory, that is, the expansibility parameters are actually measured under the condition of soaking in water and limiting the deformation of the soil sample after the soil sample is taken out of the ...

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Problems solved by technology

[0004] The object of the present invention is to overcome the shortcoming that the measurement value of expansive parameter in the above-mentioned prior art often has big difference with the actual situation on site, and provides a kind of expansive soil expansive parameter in-situ testing device

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