爆破地震波作用下法兰接口燃气管道动力失效机制

赵珂; 蒋楠; 贾永胜; 姚颖康; 朱斌; 周传波

doi:10.11883/bzycj-2020-0320

爆破地震波作用下法兰接口燃气管道动力失效机制

doi: 10.11883/bzycj-2020-0320

赵珂^1,,
蒋楠^{1, 2, ,},
贾永胜^{2, 3},
姚颖康^{2, 3},
朱斌¹,
周传波¹

1.
中国地质大学（武汉）工程学院，湖北武汉 430074
2.
江汉大学工程爆破湖北省重点实验室，湖北武汉 430024
3.
武汉爆破有限公司，湖北武汉 430024

基金项目: 国家自然科学基金（41807265，41972286）；爆破工程湖北省重点实验室开放基金重点项目（HKLBEF202001）

详细信息

作者简介:
赵　珂（1996－　），男，硕士研究生，zk942283319@163.com

通讯作者:
蒋　楠（1986－　），男，博士，副教授，happyjohn@foxmail.com

中图分类号: O389
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- 被引次数: 0
出版历程
- 收稿日期: 2020-09-10
- 修回日期: 2020-12-23
- 网络出版日期: 2021-08-13
- 刊出日期: 2021-09-14

Dynamic failure mechanism of gas pipeline with flange joint under blasting seismic wave

ZHAO Ke^1
,,
JIANG Nan^{1, 2
, ,},
JIA Yongsheng^{2, 3},
YAO Yingkang^{2, 3},
ZHU Bin¹,
ZHOU Chuanbo¹

1.
Faculty of Engineering, China University of Geosciences, Wuhan 430074, Hubei, China
2.
Hubei Key Laboratory of Blasting Engineering, Jianghan University, Wuhan 430024, Hubei, China
3.
Wuhan Explosion & Blasting Co., Ltd, Wuhan 430024, Hubei, China

摘要

摘要: 基于典型城市燃气管道直埋地层特点，通过全尺寸直埋燃气管道爆破地震实验，并结合LS-DYNA动力有限元数值计算软件建立不同爆源距离的无接口和法兰接口的燃气管道模型，分析研究了爆破地震波作用下法兰接口燃气管道动力响应特征及其失效机制。研究结果表明：管道截面应变以轴向拉伸应变为主，环向应变为辅；不同爆破工况下，无接口管道和法兰接口管道及地表峰值振动速度随爆源距离减小而增大；沿管道轴线方向，无接口管道、地表峰值振动速度以管道中心截面为对称面沿两端不断减小，法兰接口管道峰值振速由两侧向中间逐渐增大，在法兰接口处突然减小；法兰接口处出现明显的应力集中现象；管道法兰接口处是爆破地震作用下研究的关键点，螺栓的峰值有效应力、垫片轴向压力、法兰峰值有效应力、法兰偏转角随爆源距离增大而减小；法兰管道偏转角与地表峰值振动速度具有对应关系，法兰接口燃气管道中心正上方地表的控制振速（13.82 cm/s）可作为邻近燃气管道爆破工程地表的安全控制值。
- 爆破振动 /
- 动力响应 /
- 振动速度 /
- 法兰接口 /
- 控制振速
Abstract: In the process of blasting and excavation of urban subways, controlling the impact of blasting vibration on adjacent pipelines is critical. Based on the characteristics of directly buried gas pipelines in Wuhan and the full-scale direct-buried gas pipeline blasting seismicexperiment, the dynamic finite element numerical calculation software LS-DYNA was used to establish gas pipeline without joints and flange gas pipeline models under different blasting source distances. The effects of blasting seismic wave’s dynamic response characteristics of flanged gas pipeline were analyzed. The research results show that the strain of pipeline section is mainly axial tensile strain, supplemented by circumferential strain. The peak particle velocity of pipeline without joints and flange pipes and the ground surface increase with the decrease of the distance from the blasting source under different blasting conditions. Along the pipeline axis, the peak vibration velocity of the pipeline without joints and the ground surface decreases along the two ends with the central section of the pipe as the symmetry plane. The peak particle velocity of the flange pipeline gradually increases from two sides to the middle but suddenly decreases at the flange joint. There is an obvious stress concentration at the flange interface. The flange joint is the key point of pipeline under blasting earthquake. The peak effective stress of the bolt, the axial pressure of the gasket, the peak effective stress of the flange, and the flange deflection angle decrease with the increase of the explosion source distance. The deflection angle of the flanged pipeline has a corresponding relationship with the peak vibration velocity of the ground surface. The control vibration speed of 13.82 cm/s on the surface directly above the center of the flanged gas pipeline is used as the safety control value of the adjacent gas pipeline under blasting engineering.
- blasting vibration /
- dynamic response /
- vibration speed /
- flange interface /
- control vibration speed

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图 1 现场实验设计示意图

Figure 1. Schematic diagram of field experiment design

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图 2 实验监测点布置图

Figure 2. Layout drawing of experimental monitoring points

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图 3 轴向与环向动态峰值应变

Figure 3. Peak strain of axial and horizontal

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图 4 现场实验数值模型示意图

Figure 4. Schematic diagram of numerical model of field experiment

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图 5 实验和数值模拟的波形和频谱图

Figure 5. Waveform and spectrogram of experiment and numerical simulation

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图 6 法兰接口系统

Figure 6. Flange interface system

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图 7 法兰接口管道数值模型示意图

Figure 7. Schematic diagram of numerical model of flange interface pipe

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图 8 合振动速度对比图

Figure 8. Comparison chart of combined vibration speed

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图 9 监测点示意图

Figure 9. Schematic diagram of monitoring points

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图 10 管道轴线方向振速分布图

Figure 10. Vibration velocity in the axial direction of the pipeline

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图 11 管道有效应力分布图

Figure 11. Pipeline stress cloud chart

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图 12 螺栓的有效应力分布图

Figure 12. Effective stress distribution diagram of bolt

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图 13 各个工况的螺栓的有效应力分布图

Figure 13. Effective stress distribution diagram of bolts in various working conditions

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图 14 轴向压应力分布图

Figure 14. Distribution diagram of axial compressive stress of gaskets

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图 15 垫片单元轴向压应力分布图

Figure 15. Axial compressive stress diagram of gasket unit

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图 16 法兰测点示意图

Figure 16. Schematic diagram of flange measuring point

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图 17 法兰有效应力

Figure 17. Effective stress of flange

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图 18 法兰偏转角示意图

Figure 18. Schematic diagram of flange deflection angle

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图 19 法兰偏转角与地表振速关系

Figure 19. Relationship between flange deflection angle and ground surface vibration velocity

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表 1 模型材料参数

Table 1. Model material parameters

材料	密度/(g·cm⁻³)	弹性模量/GPa	剪切模量/GPa	泊松比	黏聚力/MPa	内摩擦角/（°）	抗拉强度/MPa
管道、法兰	7.85	205.000	1.2	0.33			420.000
螺栓	7.82	210.000	1.0	0.30			660.000
粉质黏土	1.98	0.012	4.3	0.28	0.035	15	0.028
砂岩	2.40	3.000	11.2	0.28	5.500	43	2.580

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表 2 爆轰产物状态方程参数

Table 2. Detonation product state equation parameters

ρ/（g·cm⁻³）	A/GPa	B/GPa	R₁	R₂	ω	E₀/GPa	V/cm³
1.25	214	18.2	4.2	0.9	0.1	4.19	1

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表 3 数值模拟结果与实测数据对比分析

Table 3. Comparative analysis of numerical simulation results and measured data

工况	监测点	合振动速度、应变		误差率/%
工况	监测点	现场实验	数值模拟	误差率/%
Ⅰ	D3	1.65 cm/s	1.72 cm/s	4.2
	D4	1.17 cm/s	1.26 cm/s	7.6
	D6	0.76 cm/s	0.72 cm/s	5.3
	D7	1.45 cm/s	1.54 cm/s	6.2
	S₁	28.65×10⁻⁶	34.23×10⁻⁶	19.4
	S₂	13.54×10⁻⁶	8.56×10⁻⁶	3.7
Ⅱ	D3	2.84 cm/s	2.76 cm/s	8.0
	D4	1.99 cm/s	2.06 cm/s	3.5
	D6	2.64 cm/s	2.73 cm/s	9.0
	D7	1.32 cm/s	1.46 cm/s	10.6
	S₁	36.71×10⁻⁶	41.23×10⁻⁶	12.3
	S₂	16.12×10⁻⁶	13.15×10⁻⁶	18.4
Ⅲ	D3	6.57 cm/s	6.98 cm/s	6.2
	D4	4.18 cm/s	4.45 cm/s	6.4
	D6	5.47 cm/s	5.78 cm/s	5.6
	D7	3.98 cm/s	4.15 cm/s	4.3
	S₁	37.15×10⁻⁶	43.23×10⁻⁶	16.3
	S₂	15.96×10⁻⁶	18.56×10⁻⁶	16.2
Ⅳ	D3	15.19 cm/s	15.32 cm/s	0.8
	D4	11.21 cm/s	12.54 cm/s	1.3
	D6	13.18 cm/s	14.25 cm/s	8.1
	D7	7.34 cm/s	8.32 cm/s	13.4
	S₁	187.06×10⁻⁶	198.09×10⁻⁶	5.9
	S₂	19.23×10⁻⁶	22.63×10⁻⁶	17.7
Ⅴ	D3	30.45 cm/s	31.56 cm/s	3.6
	D4	21.19 cm/s	23.23 cm/s	9.6
	D6	28.45 cm/s	29.56 cm/s	3.9
	D7	12.15 cm/s	13.21 cm/s	8.7
	S₁	209.50×10⁻⁶	225.61×10⁻⁶	7.6
	S₂	35.62×10⁻⁶	42.66×10⁻⁶	19.8

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表 4 垫片的各项参数

Table 4. The parameters of the gasket

密度/（g·cm⁻³）	E_x/MPa	E_y/MPa	E_z/MPa	μ_xy	μ_yz	μ_xz	G_xy/MPa	G_yz/MPa	G_xz/MPa
7.85	232.17	434.51	19089.64	0.44	0.008	0.005	115.88	32770.11	103.59

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