爆炸载荷作用下焊缝区附近埋地X70钢管的动力响应分析

李正鹏; 曲艳东

doi:10.11858/gywlxb.20190831

爆炸载荷作用下焊缝区附近埋地X70钢管的动力响应分析

doi: 10.11858/gywlxb.20190831

李正鹏^1,,
曲艳东^{1, 2,*, ,}

1.
辽宁工业大学土木建筑工程学院，辽宁锦州　121001
2.
大连民族大学土木工程学院，辽宁大连　116650

基金项目: 国家自然科学基金（11302094）；辽宁省高等学校优秀人才项目（LJQ2014063）；辽宁省自然科学基金（20170540441）

详细信息

作者简介:
李正鹏（1993－），男，硕士研究生，主要从事爆炸力学与爆炸安全研究. E-mail: 17839988929@163.com

通讯作者:
曲艳东（1978－），男，博士，教授，主要从事爆炸力学与爆炸安全研究. E-mail: plxfeng2009@sohu.com

中图分类号: O383.1; TE973
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出版历程
- 收稿日期: 2019-09-04
- 修回日期: 2019-10-19

Dynamic Response Analysis of Buried X70 Steel Pipe near Weld Zone under Blast Loads

LI Zhengpeng^1
,,
QU Yandong^{1, 2,*
, ,}

1.
School of Civil and Architectural Engineering, Liaoning University of Technology, Jinzhou 121001, Liaoning, China
2.
College of Civil Engineering, Dalian Minzu University, Dalian 116650, Liaoning, China

摘要

摘要: 爆破地震效应对埋地管线的影响已成为工程爆破领域研究的热点。基于有限元软件ANSYS/LS-DYNA，以两种含Y型焊缝（坡口有2 mm余高焊缝和坡口无余高焊缝）的埋地X70钢管为例，数值模拟研究了TNT炸药量相同（4.473 kg）而炸高（60.0、85.0和110.0 cm）不同时，焊缝区附近埋地X70钢管的动力响应规律。研究表明：当炸高为60.0 cm时，焊缝有余高的管道受应力集中的影响较大，且先于焊缝无余高的管道进入屈服阶段；当炸高为60.0和85.0 cm时，焊缝有余高的管道整体抵抗变形的能力明显弱于焊缝无余高的管道。管土间的相互作用对X70管道背爆面有支撑作用，可有效地减小管道背爆面的位移。在相同条件下，焊缝有余高的X70管道抵抗振动的性能弱于焊缝无余高的管道，且与焊缝形式相比，炸高对含焊缝区的X70管道的最大振速起主要影响作用。
- 爆炸载荷 /
- X70钢管 /
- 埋地管线 /
- 动力响应
Abstract: The influence of blasting seismic effect on buried pipes has been an important research hotspot in the field of engineering blasting. Taking two kinds of buried X70 steel pipes with Y-type welds (groove with 2 mm weld reinforcement and groove without weld reinforcement) as examples, the dynamic behaviors of buried X70 steel pipes near the weld zone under blast loads were studied numerically by the finite element software ANSYS/LS-DYNA. The blast loads are formed by detonating 4.473 kg TNT with different blast heights (60.0, 85.0 and 110.0 cm). The results show that when the blast height is 60.0 cm, the pipe with weld reinforcement is greatly affected by stress concentration and that it yields earlier than the pipe without weld reinforcement. When the blast heights are 60.0 cm and 85.0 cm, the ability of the pipe with weld reinforcement to resist deformation is significantly weaker than that of the pipe without weld reinforcement. The interaction between soil and pipe supports the explosion-back surface of the X70 pipe, which can effectively reduce the displacement of the explosion-back surface of the X70 pipe. Under the same conditions, the vibration resistance performance of the X70 pipe with weld reinforcement is weaker than that of pipe without weld reinforcement. Moreover, compared with the weld form, blast height plays an important role in the maximum vibration velocity of the X70 pipe near weld zone.
- blast loads /
- X70 steel pipe /
- buried pipeline /
- dynamic response

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图 1 计算模型

Figure 1. Calculation model

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图 2 焊缝的设计尺寸

Figure 2. Design of weld size

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图 3 焊缝的简化模型

Figure 3. Simplified diagram of weld model

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图 4 不同时刻X70钢管道的von Mises应力

Figure 4. von Mises stress of X70 steel pipe at different moments

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图 5 管道A(H = 2.0 mm)典型单元的应力时程曲线

Figure 5. Stress-time curves of classic element of A pipe (H = 2.0 mm)

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图 6 管道B(H = 0)典型单元的应力时程曲线

Figure 6. Stress-time curves of classic element of B pipe (H = 0)

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图 7 管道典型单元的速度时程曲线

Figure 7. Velocity-time curve of typical pipeline elements

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表 1 计算工况

Table 1. Calculation conditions

Weld type	Buried depth of pipeline/m	Size of TNT/(cm × cm × cm)	h_B/cm
No weld reinforcement (H = 0)	1.5	14.0 × 14.0 × 14.0	60.0, 85.0, 110.0
Weld reinforcement (H = 2.0 mm)	1.5	14.0 × 14.0 × 14.0	60.0, 85.0, 110.0

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表 2 炸药材料参数^[12]

Table 2. Material parameters of explosive^[12]

ρ_z/(g·cm^–3)	D/(m·s^–1)	p/GPa	A/GPa	B/GPa	R₁	R₂	ω	E/(J·cm^–3)
1.58	6 930	21	373.77	3.75	4.15	0.90	0.35	6 000

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表 3 土体材料参数^[13–14]

Table 3. Material parameters of soil^[13–14]

ρ_t/(g·cm^–3)	G/MPa	K/MPa	a₀/Pa²	a₁/Pa	a₂
1.8	41.14	87.87	2.12 × 10⁸	5.23 × 10³	3.22 × 10^–2

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表 4 管道及焊缝材料参数^[15–18]

Table 4. Material parameters of pipe and weld bead^[15–18]

Material	ρ/(g·cm^–3)	μ	E_s/GPa	E_t/GPa	σ_y/GPa
X70-pipeline^[15–16]	7.90	0.3	210	13.5	0.48
Weld bead^[17–18]	7.25	0.3	220	15.3	0.55

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表 5 埋地X70管道的迎爆面和背爆面的最大位移

Table 5. Maximum displacement of explosion-front and explosion-back surfaces of buried X70 pipeline

Types of weld	h_B/cm	Maximum displacement/cm
Types of weld	h_B/cm	Explosion-front surface	Explosion-back surface
Weld reinforcement (H = 2.0 mm)	60.0	5.482	0.846
	85.0	3.179	0.455
	110.0	2.464	0.220
No weld reinforcement (H = 0)	60.0	5.212	0.943
	85.0	2.912	0.570
	110.0	2.340	0.290

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表 6 不同炸高时埋地X70管道的最大等效应变

Table 6. Maximum effective strain of buried X70 pipeline with different blasting heights

Types of weld	h_B/cm	Peak effective strain/10^–3
Weld reinforcement (H = 2.0 mm)	60.0	9.937
	85.0	4.162
	110.0	2.251
No weld reinforcement (H = 0)	60.0	6.877
	85.0	2.673
	110.0	1.656

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表 7 埋地X70管道的迎爆面和背爆面最大振速

Table 7. Maximum vibration velocity of explosion-front and explosion-back surfaces of buried X70 pipeline

Types of weld	h_B/cm	Maximum vibration velocity/(m·s^–1)
Types of weld	h_B/cm	Explosion-front surface	Explosion-back surface
Weld reinforcement (H = 2.0 mm)	60.0	22.748	4.431
	85.0	9.316	2.817
	110.0	4.503	1.693
No weld reinforcement (H = 0)	60.0	24.348	4.294
	85.0	9.855	2.867
	110.0	4.832	1.746

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