Ultrasonic technology-based method for detecting and evaluating damage of subgrade soil materials in seasonal frozen regions

Abstract

The invention discloses an ultrasonic technology-based method for detecting and evaluating damage of subgrade soil materials in seasonal frozen regions. The method comprises the following steps: an initial state sample and a test sample are prepared according to an evaluation scheme on the basis of a formed sample meeting requirements of subgrade soil; the initial state sample is not subjected tofreeze-thaw cycles and has humidity being the evaluation standard moisture content; the test sample is a soil sample which is subjected to freezing and thawing cycling and has humidity at the requiredmoisture content for testing; the initial state sample and the test sample are both subjected to geometric parameter measurement and ultrasonic wave velocity test, the volume deformation rate of thetest sample and the longitudinal wave velocity of the test sample and the initial state sample are obtained, the longitudinal wave velocity, the moisture content and the volume deformation rate of thetest sample are measured according to the longitudinal wave velocity and moisture content of the initial state sample, and the damage variable of the test sample is calculated. Therefore, with the method, the damage degree of soil can be evaluated accurately, comprehensively and non-destructively and the damage mechanism can be reflected without destructive tests.

Description

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AI Technical Summary

Benefits of technology

This patented describes methods used to evaluate damaged subgrades from winters without causing any harm or discomfort when they were frozen overnight. These techniques involve analyzing changes caused due to water evaporation at different levels within these environments. By measuring specific parameters such as temperature, relative humidities, time between freezes/ thaws, and amount of snow remaining after each cycle, this technique allows researchers to better identify potential issues with existing systems like concrete roads.

Problems solved by technology

This patented technical problem addressed in this patents relates to detecting and evaluating damaged or worn out ground surfaces during cold weather periods with varying degrees of severely impacted temperatures (C) over time. Existing techniques are either limited in their ability to provide accurate data based upon these variations, which makes them difficult to evaluate and manage effectively across multiple locations within country borders worldwide.

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