Device and method for testing soil-water characteristic curve of sandy soil

Abstract

The invention discloses a device and a method for testing a soil-water characteristic curve of sandy soil. The testing device comprises a cylinder soil column test die, a water supplementing system, awater sensor, a water acquiring system and a data analyzing and processing system, wherein the water supplementing system carries out uniform water supplementation by simulating underground water andcan maintain the water supplementing level; the water sensor detects the water in a soil sample of the sandy soil to be tested in real time; the water acquiring system is connected with the water sensor; and the data analyzing and processing system makes the soil-water characteristic curve according to an analyzing result of the water acquiring system through internal processing operation. The testing method comprises the following steps: 1 preparing the soil sample of the sandy soil; 2 charging in a die; 3 supplementing water, detecting the water content in the soil column of the sandy soilin fixed time and transmitting detected data to the data analyzing and processing system; and 4 when the water content in the soil column of the sandy soil is in a stable state, and making the soil-water characteristic curve by the data analyzing and processing system. The invention has simple and reasonable structure and convenient use and operation and can effectively solve the practical problems of high test difficulty and inaccurate test result of the prior device for testing the soil-water characteristic curve.

Description

technical field [0001] The invention relates to a soil moisture characteristic curve test device and a test method, in particular to a sandy soil soil water characteristic curve test device and a test method. Background technique [0002] The soil-water characteristic curve, that is, the soil moisture characteristic curve, is mainly used to describe the relationship between soil suction and moisture content. Therefore, the most important thing to establish a soil-water characteristic curve is to measure soil suction and moisture content. At present, there are many methods for testing soil-water characteristic curves indoors, such as volumetric pressure plate method, Temple meter method, filter paper method, etc. However, the soil-water characteristic curves of soils tested under different conditions are quite different, showing different behaviors Therefore, in the above test methods, the external test environment has a great influence on the test results, and the test resul...

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Problems solved by technology

At present, there are many methods for testing soil-water characteristic curves indoors, such as volumetric pressure plate method, Temple meter method, filter paper method, etc. However, the soil-water characteristic curves of soils tested under different conditions are quite different, showing different behaviors Therefore, in the above test methods, the external test environment has a greater impact on the test results, and the test results are unstable and inaccurate

In addition, the field suction test can use tensiometer, heat conduction probe and other methods, but the field conditions are complex, so the soil-water characteristic curve test is more difficult

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