Damage detection and evaluation method of subgrade soil materials in seasonally frozen regions based on ultrasonic technology
A material damage and evaluation method technology, which is applied in the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, analyze materials, and thermal analysis of materials, etc., can solve problems such as the inability to accurately and comprehensively evaluate the damage mechanism of soil damage
Active Publication Date: 2020-07-14
JILIN JIANZHU UNIVERSITY +1
View PDF8 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Therefore, if only wave velocity is used to define its damage variable, it will not be able to accurately and comprehensively assess the degree of soil damage and reflect its damage mechanism
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
preparation example Construction
[0080] The preparation process of the test sample is as follows:
[0081] Select typical soil samples for damage detection and evaluation.
[0082] Carry out the roadbed soil engineering index test on the typical soil samples, and determine the soil samples that meet the roadbed soil engineering indexes; the roadbed soil engineering indexes include liquid limit, plastic limit, plasticity index, particle composition, moisture content and California bearing ratio Wait.
[0083] The optimal water content and maximum dry density of the soil samples that meet the roadbed soil engineering indicators are determined by heavy-duty compaction tests.
[0084] Obtain the degree of compaction required in actual subgrade soil engineering.
[0085] According to the degree of compaction, the optimum water content and the maximum dry density, the mass and amount of water needed to prepare the molded sample are calculated; the air-dried soil is a soil sample that meets the roadbed soil engine...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| diameter | aaaaa | aaaaa |
Login to View More
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
technical field [0001] The invention relates to the technical field of road construction material detection, in particular to a damage detection and evaluation method for subgrade soil materials in seasonally frozen regions based on ultrasonic technology. Background technique [0002] The seasonally frozen area refers to the area where the surface soil freezes in winter and completely melts in summer. The distribution area of China's seasonally frozen regions is 5.137×10 6 km 2 , covering more than 10 provinces in North China, Northeast China, Northwest China, Southwest China and East China, accounting for about 53.5% of China's land area. For subgrade projects in seasonally frozen regions, subgrade soil is subject to the effects of freeze-thaw cycles caused by diurnal temperature differences and seasonal climate changes, as well as changes in subgrade humidity caused by changes in external hydrological and hydrogeological conditions. Under the influence of external env...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/42G01N25/00G01N29/07
CPCG01N1/28G01N1/42G01N25/00G01N29/07
Inventor 张互助刘寒冰高春妹王静张熙颖董伟智刘忠根朱春凤
Owner JILIN JIANZHU UNIVERSITY