Coarse-grained saline soil salt swelling and dissolution multifunctional test device

Abstract

The invention discloses a salt expansion and melt sinking multifunctional testing device for coarse-particle salty soil, which aims at being applicable to an open system and further having the advantages of wide adaptive range, high degree of automation and accurate test data. According to the adopted technical scheme, the salt expansion and melt sinking multifunctional testing device for the coarse-particle salty soil comprises a working platform, wherein the working platform is provided with an organic testing barrel used for placing a soil sample; a heat-insulation layer is arranged outside the organic testing barrel; the bottom of the organic testing barrel is connected with a water replenishing device; the bottom of the organic testing barrel is provided with a water-permeable stone; a plurality of TDR (Time Domain Reflectometry) probes are embedded in the organic testing barrel; the TDR probes are connected to a data collection and control system; the top and the bottom of the organic testing barrel are connected with a freeze thawing circulating device; the working platform is provided with a fixing rack; the fixing rack is provided with a sliding mechanism; the sliding mechanism is provided with a pressure head; the pressure head is located at the upper end of the top of the organic testing barrel; the sliding mechanism is also provided with a compacting device used for compacting the soil sample.

Description

technical field [0001] The invention belongs to the technical field of road paving test equipment, in particular to a multifunctional test device for salt swelling and dissolution of coarse grain saline soil. Background technique [0002] Saline soil is a general term for saline soil, alkaline soil and various salinized and alkalized soils. The area of ​​saline soil in the world is about 8.970 million square kilometers, accounting for about 6.5% of the world's total land area and 39% of the total area of ​​arid regions. The area of ​​saline soil in China is about 200,000 square kilometers, accounting for about 2.1% of the total land area. Saline soil is mainly distributed in the inland arid and semi-arid areas of my country, and also in coastal areas. With the continuous advancement of my country's "Belt and Road" and the high-speed rail technology going abroad, it is inevitable to pave road subgrades and railway subgrades in saline soil areas. When laying roadbeds and ra...

AI Technical Summary

Problems solved by technology

This kind of equipment has many disadvantages: saline soil samples are small; it cannot monitor the temperature change and moisture content of soil samples at different depths during the freeze-thaw cycle; it cannot realize one-dimensional temperature transfer; it cannot measure the soil mass after the freeze-thaw cycle Intensity change law; the test equipment is a closed system, ignoring the capillary recharge of groundwater; the dissolution test after the freeze-thaw cycle cannot be carried out, etc.

Therefore, the test results obtained by using the previous test equipment have limited reference value for engineering construction

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