System and method for measuring soil moisture characteristic curve by using centrifuge method

Abstract

The invention discloses a system and method for measuring a soil moisture characteristic curve by using a centrifuge method. The system includes a centrifuge, a centrifuge tube, a catchment cylinder, a magnetostriction ruler, a balance cylinder and a baffle. The centrifuge is used for centrifuging drainage on a soil sample at a set speed; the centrifuge tube is used for containing the soil sample to be tested; the catchment cylinder is arranged at the bottom of the centrifuge tube, and is a closed hollow structure used to collect water in the soil sample; the magnetostriction ruler is in installed on the cover of the centrifuge tube, and is used for measuring the expansion and contraction quantity of the soil sample; and the balance cylinder is used to ensure the balance of the centrifuge disc. According to the centrifugal speed, compression of the soil sample and displacement, the characteristic curve of the soil sample can be calculated; and after each measurement, water does not need to be poured, weighed or balanced again, so as to greatly save the workload and procedures of measurement. At the same time, the unit weight is calculated according to the compression amount of the soil sample, and the moisture content of soil sample is amended; therefore, the results are more accurate.

Description

technical field [0001] The invention relates to a measurement system and a measurement method for a soil moisture characteristic curve, in particular to a system and a measurement method for measuring a soil moisture characteristic curve by using a centrifuge method. Background technique [0002] Soil moisture characteristic curve is generally also called soil moisture characteristic curve or soil pF curve, which expresses the relationship between soil water potential and soil moisture content. It is an essential parameter to study the hydrodynamic properties of soil, and it is of great significance in production practice. [0003] The method of directly measuring the soil moisture characteristic curve by experimental method is called direct method. There are many laboratory and field methods in the direct method, such as tensiometer method, pressure membrane method, centrifuge method, sand core funnel method, equilibrium water vapor pressure method, etc., and the first thr...

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Problems solved by technology

The disadvantage is that the centrifuge tube needs to be taken out and weighed after each speed is turned, poured out the centrifuged water, and then put into the centrifuge after balancing, so the process is cumbersome and complicated; at the same time, the bulk density will increase during the process of measuring the soil moisture characteristic curve by centrifugation. Changes will have a greater impact on the accuracy of the soil moisture characteristic curve, so the change in soil bulk density needs to be measured during the measurement process, so as to use the model to revise the soil moisture characteristic curve

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