1. Faculty of engineering, China University of Geosciences, Wuhan 430074, China 2. State key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China 3. Hubei Key Laboratory of Engineering Blasting, Jianghan University, Wuhan 430056, China
A full-scale surface explosion test with buried pipeline was designed and implemented for the common shallow buried reinforced concrete pipeline with bell and spigot joints in urban areas, in order to study the safety of buried pipelines under the effect of surface explosion. The dynamic response characteristics and the crack expansion mechanism of reinforced concrete pipeline with bell and spigot joints under the action of surface explosion were analyzed based on concrete smeared crack model by combining fully coupled numerical simulation means and separated reinforced concrete modeling method. Results show that under the effect of surface explosion, the pipeline cracking in the form of oblique cracking and circumferential cracking. And the oblique cracks are all generated at the bell and spigot joints of the pipe. When the detonation source is located above the bell and spigot joints of pipeline and the middle of the pipe body, obvious oblique cracks appeared in the bell and spigot joints which closest to the detonation source. Bell and spigot joints of the pipeline is the weakest part to resistant blasting in the pipeline system.
Fig.1Schematic diagram of reinforced concrete pipeline with bell and spigot joints and its dimensions
Fig.2Design of surface explosion and monitoring plan
Fig.3Numerical model of finite element
类型
ρ/(g·cm?3)
E/GPa
μRS
σy/MPa
ET/GPa
CRS
PRS
纵筋
7.8
210
0.3
548
2
40
5
箍筋
7.8
210
0.3
350
2
40
5
Tab.1Parameters of rebar
Fig.4Reinforcement of reinforced concrete pipeline
Fig.5Contours of pressure in soil and air at different moments induced by surface explosion
Fig.6Comparison of numerical simulation and field surface explosion phenomena
监测点
Vf /(cm·s?1)
Vn /(cm·s?1)
Err/%
V1
—
4.05
—
V2
4.60
5.14
11.70
V3
11.00
10.20
7.27
V4
8.68
9.97
14.86
V5
4.70
5.09
8.30
Tab.2Comparison of peak particle velocity
监测部位
现场监测
数值模拟
Ea/%
Eb/%
εa/10?6
εh/10?6
εa/10?6
εh/10?6
w/mm
#2管
上部
—
—
174
198
0.007
—
—
底部
—
434
185
495
0
—
9.4
左侧
68
—
59
186
0
13.20
—
#3管
上部
21174
4217
8520
3470
0.290
?59.80
?17.7
底部
109
1709
117
1883
0.080
7.33
10.2
左侧
1427
230
1270
217
0.093
?11.00
?5.7
Tab.3Comparison of strain results
Fig.7Comparison of dynamic strain data of pipeline in numerical simulation and field test
Fig.8Distribution of the crack on reinforced concrete pipeline in simulation
Fig.9Local breakage of pipes in field test
Fig.10Comparison of pipe crack distribution in field test and numerical simulation
Fig.11Total energy-time curve for each part of pipeline system
Fig.12Positional relationship between explosion stress wave and pipe bell joints
Fig.13Distribution of crack in reinforced concrete pipeline
Fig.14Crack element number-time curve of pipeline
Fig.15Crack width contour of pipeline in different directions
Fig.16Distribution of width of axial cracks inside pipeline
Fig.17Effective stress contour for reinforcement of pipeline
Fig.18Distribution of pipe cracks and axial crack width contour
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