|Table of Contents|

Calculation method of thermal stress and cracks development law of asphalt pavement based on discrete element method (PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2022年5期
Page:
12-20
Research Field:
道路工程
Publishing date:

Info

Title:
Calculation method of thermal stress and cracks development law of asphalt pavement based on discrete element method
Author(s):
TANG Jun-yao1; 2;  MA Tao1;  ZHENG Bin-shuang1;  HUANG Xiao-ming1
(1. School of Transportation, Southeast University, Nanjing 211189, Jiangsu, China; 2. Shanghai Municipal Engineering Design Institute(Group)Co., Ltd, Shanghai 200092, China)
Keywords:
road engineering;  thermal stress calculation;  discrete element method;  TSRST virtual test;  low temperature cracking
PACS:
U416
DOI:
10.19721/j.cnki.1671-8879.2022.05.002
Abstract:
To reasonably characterize the meso-characteristics of asphalt mixture, and furtherly investigate the meso mechanism of thermal stress accumulation and crack propagation in the process of low-temperature cracking of asphalt mixture, the virtual test method of asphalt mixture thermal stress restrained specimen test(TSRST)was established based on the discrete element program PFC2D. According to the principle of reverse stereology and the method of probability theory, the transformation relationship between three-dimensional volume gradation and two-dimensional quantitative gradation of asphalt mixture was introduced, and the two-dimensional discrete element virtual specimen was established. Combined with the characteristics of contact behavior between components of asphalt mixture, different contact constitutive models were given. The macro parameters of aggregate and asphalt mortar were measured by laboratory test, and the meso contact parameters between materials at different temperatures were deduced. Through TSRST virtual test, the variation law of internal temperature field, temperature stress curve, distribution characteristics of meso contact force and meso-mechanism of low temperature cracking were analyzed. The results show that TSRST discrete element simulation are in good agreement with the indoor test results. The relative error of fracture temperature is 3.7%, and the relative error of fracture strength is 4.8%, which proves that the TSRST virtual test has high accuracy, and can be used as a reliable method for the evaluation of low-temperature crack resistance of specimens. The failure of the specimen can be divided into three stages, ① crack initiation stage, before the transformation point temperature, the contact failure of individual contact points in the specimen has little impact on the overall stress state of the structure, ② stable propagation stage, before the temperature reaches the fracture temperature, with the decrease of temperature and the increase of contact force, the cracks develop along the weak parts of the specimen, and the number of micro cracks increases slowly and stably, ③ unstable propagation stage, after the temperature reaches the fracture temperature, the temperature stress decreases by 66% in a short time, and the total number of cracks increases by 132. The micro cracks have gathered into visible macro cracks and expand rapidly along the relatively weak position of the structure, resulting in the loss of the overall bearing capacity of the specimen.11 tabs, 13 figs, 28 refs.

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Last Update: 2022-09-30