Measurement Method of Soil Volume Water Content Based on Electromagnetic Wave Time Domain Reflectometry

Abstract

The invention discloses a soil volume moisture content test method based on electromagnetic wave time-domain reflection method, which prepares 3-5 soil samples with different dry densities through sample preparation, and then passes a series of mass moisture content standard values, The mass water content conversion value wi of the electromagnetic wave time domain reflectometry and the test of the dry density are then fitted to obtain the relative error ηi of the mass water content and the linear regression function ηi=aρdi+b of the corresponding soil sample dry density ρdi; and draw The standard value of moisture content of the soil and the calibration coefficient ζ=1-aρd-b of the measured value of the electromagnetic wave time-domain reflectometry. Then use the electromagnetic wave time domain reflectometry to measure the volume moisture content θ of the soil to be tested, and then obtain the corrected value θ′ of the soil volume moisture content measured by the electromagnetic wave time domain reflectometry, θ′=ζθ. At the same time, the method eliminates the influence of different soil types and dry density changes on the volumetric moisture content measured by the electromagnetic wave time domain reflection method, significantly reduces the error of the test results, and the test results are accurate and reliable. So as to provide more accurate and reliable test parameters for the design and construction of geotechnical engineering.

Description

technical field [0001] The invention relates to a method for testing the water content of soil, in particular to a method for testing the water content of soil volume based on the electromagnetic wave time domain reflection method. Background technique [0002] Moisture content is an important parameter in geotechnical engineering, and it is crucial to the property evaluation, stability analysis and compaction quality control of geotechnical engineering such as roadbeds, slopes, dams, and foundations. The drying method is the standard method for measuring moisture content in the current norms. The method is: put the soil sample in an oven, keep the temperature of the oven at 105-110°C, and calculate the water loss after the water in the soil sample evaporates. Get the moisture content of the soil. The moisture content measured by this method is more accurate. However, in the on-site test, the drying method requires drilling and sampling, which has problems such as sampling...

AI Technical Summary

Problems solved by technology

For example, when the soil matric suction is determined according to the soil-water characteristic curve, a small change in soil moisture content will cause significant errors in the calculation results of the matric suction.

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