Testing device and method for rapid in-situ test of soil moisture content

Abstract

The invention discloses a testing device for a rapid in-situ test of soil moisture content. The testing device comprises a soil moisture content quick determination instrument, wherein the soil moisture content quick determination instrument comprises a weighing device; a storage sleeve is arranged above the weighing device; soil is stored in the storage sleeve; the storage sleeve is arranged in a vacuum drying chamber; the vacuum drying chamber is communicated with a vacuum pump, and air and water vapor are pumped out by the vacuum pump; the vacuum drying chamber is connected with a microwave transmitter, and the microwave transmitter transmits microwaves to the vacuum drying chamber to dry soil; a far-infrared temperature measurement device is arranged in the vacuum drying chamber and monitors the drying temperature of soil. The invention further discloses a testing method for the rapid in-situ test of the soil moisture content. According to the device and the method, the temperature of the drying process keeps 45 DEG C or lower through vacuum pressure reduction and microwave heating, stability of thermosensitive substances such as bound water and organic matter in soil is guaranteed, and precision of the moisture content test is realized on the basis that the drying measurement time is effectively shortened.

Description

technical field [0001] The invention relates to the technical fields of civil engineering and geological engineering survey, in particular to a rapid in-situ test device and method for moisture content of soil. Background technique [0002] The soil moisture content reflects the dry and wet state of the soil, and is one of the basic physical properties of the soil. It is generally defined as the ratio of the mass of free water in the soil to the mass of the remaining solid matter. In the field of geological engineering, the accurate measurement of soil moisture content is of great significance to the evaluation of engineering properties, the study of water cycle conditions, the analysis of slope stability, and the quality control of subgrade compaction. [0003] After years of rapid development, the accuracy and applicable conditions obtained based on different method principles vary greatly. Commonly used moisture content testing methods are mainly divided into direct and ...

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Problems solved by technology

Among them, the resistance method has been eliminated due to poor accuracy; the TDR method is easy to operate and can be measured continuously, and is most suitable for the field, but its circuit is complicated, the equipment is more expensive, and the relationship between the dielectric constant and the water content needs to be calibrated according to the specific situation. In order to obtain higher accuracy; the core idea of ​​the drying method is to remove water and weigh. As the standard method for measuring the moisture content of soil mass in the current norms, the test results are accurate, but there are also low efficiency and large soil samples. Difficult to dry, ectopic experimental error and other problems, can not meet the requirements of fast and convenient on-site testing

Although the existing microwave drying technology is also applied to the moisture content test of the soil, its heating method is rapid, which destroys the organic matter and bound water in the soil, making the value generally higher than that of the drying method

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