|Table of Contents|

Fatigue life evaluation of semi-rigid base course of existing expressway based on SCB test(PDF)

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

Issue:
2023年3期
Page:
1-10
Research Field:
道路工程
Publishing date:

Info

Title:
Fatigue life evaluation of semi-rigid base course of existing expressway based on SCB test
Author(s):
ZHANG Lei1;  ZHANG Ding-yi1;  CHENG Long1;  ZHUANG Yuan2; HU Hong-long3;  SUN Ying-qin1
(1. School of Transportation, Southeast University, Nanjing 210001, Jiangsu, China; 2. Jiangsu Expressway Engineering Maintenance Limited Company, Nanjing 210001, Jiangsu, China; 3. China Design Group, Nanjing 210001, Jiangsu, China)
Keywords:
road engineering;  SCB test;  FWD deflection difference;  semi-rigid base;  fatigue life evaluation
PACS:
U416.217
DOI:
10.19721/j.cnki.1671-8879.2023.03.001
Abstract:
In order to use the fatigue life calculation method of the base structure in the current pavement design specifications to estimate the fatigue life of the semi-rigid base of existing highways. Firstly, semicircular bending(SCB)fatigue test was conducted to obtain the base fatigue life equation. Then, according to the mechanical test data and theoretical simulation, the regression equations between the unconfined compressive strength and flexural tensile(splitting)strength, the FWD deflection difference and the bottom tensile stress of the base layer were established. Finally, with the help of the SCB fatigue test equation and the established regression relationship, a base-level fatigue model with unconfined compressive strength and FWD deflection difference as the index was constructed, and the model was verified. The results show that in the SCB test, the semicircular specimen is subjected to tensile stress above the bottom cut and in the regions at both ends, which is consistent with the actual stress state inside the base calculated by BISAR. The unconfined compressive strength and semicircular splitting strength of the semi-rigid base material have a good linear positive correlation, and the material with higher compressive strength has higher crack resistance. Using the established fatigue model, the fatigue life of the lime fly ash gravel base layer of road sections A, B, C and D is 6.496×1010, 2.541×1010, 6.569×1010 and 5.378×1010 times. It has been verified that the error is within 8%, which meets the accuracy requirements and can provide a decision basis for the utilization strategy of the existing semi-rigid base.3 tabs, 9 figs, 28 refs.

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Last Update: 2023-06-30