1. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China 2. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China 3. Hubei Key Laboratory of Blasting Engineering, Jianghan University, Wuhan 430056, China
The dynamic failure mechanism of concrete pipeline with corroded inner-wall subjected to blasting was analyzed in order to ensure the safety of buried concrete pipeline which had been in service for many years under the influence of blasting vibration load. A theoretical model for predicting the corrosion defects of the inner wall of concrete pipes during the operation period was established based on the concrete corrosion theory of Thistlethwayte. The numerical modeling method and parameter selection of blasting dynamic response of concrete pipeline with bell-and-spigot joints were verified based on the full-scale blasting model test and vibration analysis of concrete pipeline with bell-and-spigot joints. Numerical tests of dynamic response of concrete pipeline with bell-and-spigot joints under different corrosion defects were conducted through the prediction of corrosion defects. The dynamic performance evolution of corrosion pipeline under blasting vibration load was analyzed. The main control dynamic failure criterion of corroded pipeline was established with the ultimate strength criterion. The safety control standard of corroded concrete pipeline with bell-and-spigot joints under the influence of blasting vibration was proposed.
Tab.6Statistical relationship between peak value of maximum principal stress and peak vibration speed
t/a
h/mm
vp/ (cm·s?1)
≤10.2
0
22.80
11.9
5
21.08
13.5
10
20.41
15.2
15
19.13
16.9
20
17.81
18.5
25
17.14
20.2
30
15.62
Tab.7Vibration velocity control of concrete pipe blasting with different corrosion depths
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