Asphalt pavement load checking method based on three-dimensional strain failure criterion
A technology for asphalt pavement, guidelines, applied in the direction of testing material strength using applied stable shear force, testing material strength using applied stable tension/compression, measuring devices, etc.
Active Publication Date: 2020-12-01
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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[0006] The invention provides an asphalt pavement load check method based on three-dimensional strain failure criterion, the purpose of which is to predict the specific location of the damage source and overcome the existing problem of using one-dimensional failure criterion for pavement load check
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[0081] Step 1. Proportionate and form AC-13, AC-20 and AC-25 asphalt mixtures according to the standard test method of "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), and select the diameter and height of the specimen size Both are 100mm. Cylindrical samples with a diameter of 100 mm and a height of 106 mm were formed by a rotary compactor. Then, the end of the test piece is thrown under the action of cooling water to obtain a sample with a height of 100mm, and then the core is drilled to obtain a hollow cylinder test piece for testing, such as figure 2 shown.
[0082] Self-developed three-way loading equipment was used to carry out plane isobaric / axial compression, plane isobaric / axial tension and plane tension / axial tension tests to obtain AC-13, AC-20 and AC- 25 asphalt mixture failure characteristic point three-dimensional principal stress and vertical strain data.
[0083] Step 2. Establish AC-13, AC-20 and AC-25 asphalt mixt...
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The invention relates to an asphalt pavement load checking method based on a three-dimensional strain failure criterion. The method comprises the following steps: carrying out planar isobaric / axial compression, plane isobaric / axial stretching and plane tension-compression / axial tension test on a hollow cylindrical mixture test piece based on an asphalt mixture triaxial test system and method to obtain multi-axial strength test results of the asphalt mixture; converting the established three-dimensional stress failure criterion model into a three-dimensional strain failure criterion model through a generalized Hooke theorem; and carrying out load checking on the typical high-grade asphalt pavement in a complex stress state by utilizing a three-dimensional strain failure criterion to accurately predict the specific position of a destroy source. According to the method, the problem that a one-dimensional failure criterion adopted in existing asphalt pavement design does not correspond toan actual stress-strain state is solved, and support is provided for designing an asphalt pavement structure according to the complex stress state.
Description
technical field [0001] The application belongs to the field of road engineering, and relates to a load check method for asphalt pavement based on a three-dimensional strain failure criterion. Background technique [0002] With the rapid development of my country's economy and the continuous increase of traffic volume, the requirements for road performance are getting higher and higher. Asphalt pavement is the main form of high-grade highways in my country. widely used. However, some asphalt pavements have different degrees of early failure before reaching their service life. In addition to construction quality, overloading and heavy loads, unreasonable asphalt mixture design and other reasons, unreasonable pavement structure design has an important impact. Under the combined effect of the above factors, the load response of the pavement under the wheel load eventually exceeds the structural resistance, causing a series of damages. [0003] At present, my country's 2017 vers...
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IPC IPC(8): G01N3/24G01N3/12G01N3/10
CPCG01N3/10G01N3/12G01N3/24G01N2203/0017G01N2203/0019G01N2203/0025G01N2203/0044G01N2203/0075G01N2203/0256G01N2203/0266
Inventor 黄拓唐耀郭攀曹泽前黄芯吕松涛钱国平郑健龙
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY