Sectional type ring direction temperature control unsaturated soil column testing apparatus

Abstract

The invention discloses a sectional type ring direction temperature control unsaturated soil column testing apparatus. The testing apparatus is characterized in that each ring direction temperature control soil sample ring is fixed with a base; each soil sample ring is filled with a soil sample in a layered way, the multiple ring direction temperature control soil sample rings are in bolted connection to form a model drum, the side face of each temperature control ring is provided with two flow guide holes connected with flow guide pipes, and the temperature control rings are connected with a temperature control system by means of the flow guide pipes; the temperature control system keeps temperature constancy in a water tank by means of a constant temperature water cooling / warming machine, and circular flowing of constant temperature water in the temperature control rings is realized by means of a circulating pump. Soil column temperature is controlled in a sectional way by means of the mutually independent temperature control rings, a time period for a soil column to generate temperature gradient is shortened, multiple temperature gradient models can be simulated, and the aim of researching a moisture movement process under different temperature gradient actions is achieved.

Description

technical field [0001] The invention relates to a test device for water migration in soil under the action of temperature, in particular to a test device for unsaturated soil column with controllable temperature gradient. Background technique [0002] For water-air transport experiments in unsaturated soils under the action of temperature, the temperature boundary is generally imposed on the surface or bottom of the soil column model, and the temperature conducts in the soil column to form a temperature gradient. By arranging the temperature or water content along the depth The rate sensor monitors the temperature conduction and moisture migration process in the soil column. Due to the low thermal conductivity of the soil, the temperature conduction process in the soil column is slow, and the test period is long; the temperature gradient is formed in a small depth range at the initial stage of the test, and it is difficult to arrange a sufficient number of sensors for monito...

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Problems solved by technology

[0003] At present, experts and scholars at home and abroad have done a lot of experimental research on water migration in unsaturated soil under the action of temperature. The method generally used is to impose a temperature boundary on the top or bottom of the soil column, but the soil forms within the entire depth range. The temperature gradient takes a long time, and the temperature gradient model formed is relatively simple; or by reducing the height of the soil column, the drying method is used to sample the change of moisture content, but this method has obvious disturbance to the soil and cannot realize real-time monitoring

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