Abstract
Due to the seasonal permafrost thawing, the Qinghai–Tibet Highway has a depression and instability of the roadbed. In order to obtain the ablation interface and water content characteristics of seasonal permafrost areas, non-destructive ground penetrating radars using electromagnetic wave detection methods are widely used. Regarding the imaging of the ablation interface in permafrost regions, this paper proposes a high-precision procedure for seasonal permafrost media using waveform difference analysis, electromagnetic wave attenuation attribute calculation and relative wave impedance conversion. It improves the resolution and division accuracy of the imaging. In addition, the study demonstrates a method to calculate the temperature and water content of the ablation zone by mining attenuation attribute, relative wave impedance attribute, absolute instantaneous amplitude attribute and the weighted average frequency attribute parameters under the constraints of the measured data. This method has high accuracy and high efficiency and can be used in the rapid calculation of temperature and water content of seasonal permafrost on the Qinghai–Tibet Highway.
Highlights
Various rocks and soils with temperatures below 0 oC and containing ice are often referred to as frozen soils
According to the time when the soil is in a state of continuous freezing, the frozen soil is generally divided into short-term frozen soil, seasonal permafrost, and permafrost
Detecting the interface of seasonal permafrost thawing, the formation temperature and the water content in the soil are of great significance for judging the stability and safety of the road project
Summary
Various rocks and soils with temperatures below 0 oC and containing ice are often referred to as frozen soils. Detecting the interface of seasonal permafrost thawing, the formation temperature and the water content in the soil are of great significance for judging the stability and safety of the road project. It provides data for global warming research. Used dual-frequency (100 MHz and 400 MHz) ground penetrating radar data to study the important layered interfaces such as the seasonal active layer and the top surface of the frozen soil These studies mainly focus on two aspects: 1) the size, shape and distribution of ice bodies in the permafrost; 2) the layered structure of the thermal state. The water content and formation temperature of the measurement area were calculated
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