Test device and test method for gaseous water migration characteristics of unsaturated soil

Abstract

The invention discloses an unsaturated soil vaporous water transfer characteristic testing device and a testing method thereof. The unsaturated soil vaporous water transfer characteristic testing device comprises a testing model system and a temperature and humidity control system, wherein the testing model system comprises a testing cavity, and a plurality of containers which are arranged in the testing cavity and are used for holding soil body test samples; cooling devices are arranged on the tops of the containers; the containers are wound with corresponding vacuum heat insulating cavities; the temperature and humidity control system is communicated with the bottoms of the containers through pipelines, and is used for regulating and controlling the temperature and humidity of the soil body test samples; temperature sensors for monitoring the temperature of the soil body test samples and moisture sensors for monitoring the water content of the soil body test samples are arranged in the containers. The testing device is an experimental device for measuring the transfer rules of a plurality of groups of vaporous water of different temperature and relative humidity at a one-dimensional temperature gradient, so that a theoretical basis is laid for accurate control of a vaporous water supplement boundary.

Description

technical field [0001] The invention relates to a test device and a test method for the migration characteristics of gaseous water in unsaturated soil, belonging to the technical field of civil (rock and soil) engineering. Background technique [0002] Roadbed disease has always been an important problem that plagues the construction of roads, railways, and airports in our country. The longitudinal migration of water vapor under the temperature gradient is the main cause of disasters such as frost heaving and mud turning. [0003] Current research mainly focuses on the migration of liquid water, while groundwater may also migrate in gaseous form. For the soil with relatively shallow groundwater table and strong capillary, the humidity in the soil is mainly supplied by liquid water; for arid or semi-arid areas, where the evaporation is large and the groundwater table is deep, the humidity in the entire unsaturated soil is mainly transported by gaseous water Mainly, it is fo...

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Problems solved by technology

However, this method cannot accurately control the temperature and concentration of gaseous water, which leads to the inaccurate and extensive research on the moisture movement of unsaturated soil, and the failure to carry out targeted prevention and control of disasters caused by moisture migration in engineering.

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