Time domain reflection technology-based moisture transport measuring device

Abstract

The invention discloses a time domain reflection technology-based moisture transport measuring device. The device comprises a soil accommodating cylinder, a water accommodating base, a technical data report (TDR) soil moisture quick measurer and a water supply device, wherein a soil body sample is filled in the soil accommodating cylinder; the bottom end of the soil accommodating cylinder is matched with the top end of the water accommodating base; the middle part of the water accommodating base is a cavity; a water-permeable support component is arranged in the cavity; a water inlet pipe and a water level observing pipe are arranged outside the water accommodating base; the TDR soil moisture quick measurer comprises a probe, a wire and a host; the probe is embedded in the soil body sample of the soil accommodating cylinder; one end of the wire is connected with the probe; the other end passes through a through hole on the wall surface of the soil accommodating cylinder and can be connected with the host; the water supply device comprises a water supply tank and a base plate; the water supply tank is positioned above the base plate; an elastic bearing device is connected between the water supply tank and the base plate; and the water outlet of the water supply tank is connected with the water inlet pipe of the water accommodating base by a conduit. The moisture content in the soil body can be accurately measured in real time by the moisture transport measuring device.

Description

technical field [0001] The invention belongs to measuring devices in geotechnical engineering, in particular to a moisture migration measuring device based on time-domain reflectometry technology. Background technique [0002] In the foundation design of highways, airports, dams and other projects, how to waterproof and keep moisture and keep the relative stability of soil moisture is a very critical issue. Moisture migration is a common phenomenon in soil, and it is an important factor to be considered in engineering design. For example, in the subgrade of high-grade highways, the migration of water will cause the subgrade soil to absorb moisture and soften, resulting in the strength reduction or instability of the subgrade, which will affect the durability and usability of the pavement structure. The migration of water makes the soil at different depths have different moisture content, and the moisture content of the soil changes with the change of the groundwater level. ...

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Problems solved by technology

[0003] At present, most of the applied research on water migration in my country is concentrated in the agricultural water conservancy department, and the research area is mostly limited to the soil salinization area and the seasonal freeze-thaw area. The relatively simple vertical pipe method is generally used to measure the height of capillary water rise , that is, use a small-aperture circular tube to bury the soil sample and test it. Although the structure of the device is simple, the measured water migration and soil water content are not accurate enough.

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