浅埋三舱管廊甲烷爆炸的地面响应规律

王桂林; 欧阳啸天; 翟俊; 孙帆

doi:10.11858/gywlxb.20200616

浅埋三舱管廊甲烷爆炸的地面响应规律

doi: 10.11858/gywlxb.20200616

王桂林^{1, 2,*, ,},
欧阳啸天^{1, 2},
翟俊³,
孙帆^{1, 2}

1.
重庆大学土木工程学院，重庆　400045
2.
库区环境地质灾害防治国家地方联合工程研究中心，重庆　400045
3.
重庆大学三峡库区生态环境教育部重点实验室，重庆　400045

基金项目: 国家重点研发计划（2018YFB2101000）

详细信息

作者简介:
王桂林（1970－），男，博士，教授，主要从事岩土工程研究. E-mail：glw@cqu.edu.cn

通讯作者:
王桂林（1970－），男，博士，教授，主要从事岩土工程研究. E-mail：glw@cqu.edu.cn

中图分类号: O382
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出版历程
- 收稿日期: 2020-09-21
- 修回日期: 2020-10-15

Ground Response Law of Methane Explosion in Shallow Buried Three-Cabin Pipe Gallery

WANG Guilin^{1, 2,*
, ,},
OUYANG Xiaotian^{1, 2},
ZHAI Jun³,
SUN Fan^{1, 2}

1.
School of Civil Engineering, Chongqing University, Chongqing 400045, China
2.
National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas, Chongqing 400045, China
3.
Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Chongqing University, Chongqing 400045, China

摘要

摘要: 地下综合管廊可燃性气体爆炸事故时有发生，给地面人员的生命和财产造成了巨大损失。依托重庆市某地下综合管廊试点工程，基于物质点法，采用点火增长模型模拟浅埋管廊泄漏甲烷气体爆炸冲击管廊本体结构和围岩的过程，研究爆炸作用下地面压强与位移的响应特性。研究发现：泄爆作用下管廊及围岩会出现因接触面反射和折射产生的次生应力波，管廊横向方向次生波振幅随距起爆点水平距离的增大而增大，而管廊纵向方向产生的次生波振幅较小，且随距离增大变化较小；爆炸作用造成整体地面沉降，但在起爆点中心附近地面隆起，这种隆起由管廊本体结构破裂，气体直接冲击岩土体形成的剧烈隆起和管廊整体震动形成的轻微隆起两部分组成。
- 管廊 /
- 甲烷爆炸 /
- 地面响应 /
- 物质点法
Abstract: Explosion venting accidents in underground comprehensive pipe corridors occur from time to time, causing huge losses to ground personnel and property. Based on a pilot project of an underground comprehensive pipe gallery in Chongqing and the material point method, a high-energy combustion model is used to simulate the process of leaking methane gas explosive’s impact on the structure and surrounding rock of the pipe gallery. Through the simulation, the response characteristics of ground pressure and displacement are studied. The results show that: under the effect of explosion, secondary stress waves caused by reflection and refraction of the contact surface will appear in the pipe gallery and surrounding rock. In the transverse direction, the amplitude of the secondary wave increases with the increase of the horizontal distance from the initiation point, while that generated in the longitudinal direction keeps smaller, and the change remains small with the increasing distance. The explosion caused the overall ground subsidence, but the ground bulged near the center of the detonation point. This bulge was composed of a violent bulge formed by the pipe gallery lining broken and gas directly impacting the rock and soil, and a slight bulge formed by the overall vibration of the pipe gallery.
- pipe gallery /
- methane explosion /
- ground response /
- material point method

HTML全文

图 1 2014年高雄地下丙烯管道爆炸现场^[1]

Figure 1. Explosion scene of the underground propylene pipeline in Kaohsiung in 2014^[1]

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图 2 多物体接触计算示意图

Figure 2. Schematic diagram of multi-object contact algorithm

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图 3 某地下综合管廊现场照片

Figure 3. Picture of an underground comprehensive pipe gallery

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图 4 数值模拟模型内部示意图

Figure 4. Internal schematic diagram of numerical simulation model

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图 5 模型截面示意图

Figure 5. Model section schematic

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图 6 爆炸后不同时刻地面压强分布

Figure 6. Distribution of ground pressure at different times after explosion

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图 7 管廊横向质点压强随时间变化曲线

Figure 7. Variation curves of particle pressure in the horizontal direction of pipe gallery with time

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图 8 管廊横向质点压强峰值随起爆点距离的变化

Figure 8. Peak particle pressure in the horizontal direction of pipe gallery with distance of initiation point

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图 9 管廊纵向质点压强随时间变化曲线

Figure 9. Variation curves of particle pressure in the longitudinal direction of the pipe gallery with time

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图 10 管廊纵向质点压强峰值随起爆点距离变化

Figure 10. Peak particle pressure of the pipe gallery with the distance of the initiation point in the longitudinal direction

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图 11 不同时刻地面竖向位移响应分布情况

Figure 11. Distribution of ground vertical displacement at different times

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图 12 管廊纵向质点竖向位移随时间变化曲线

Figure 12. Variation curves of vertical displacement of particles in the longitudinal direction of pipe gallery with time

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图 13 管廊纵向质点相对竖向位移随起爆点距离的变化

Figure 13. Relative vertical displacement of particlesin the longitudinal direction of pipe gallerywith distance of initiation point

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图 14 管廊横向质点相对竖向位移随时间变化曲线

Figure 14. Variation curves of relative vertical displacement of particles in the horizontal direction of pipe gallery with time

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图 15 管廊横向质点相对竖向位移随距起爆点距离变化

Figure 15. Rrelative vertical displacement of particles in the horizontal direction of pipe gallery with distance of initiation point

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表 1 围岩和管廊本体结构力学参数

Table 1. Mechanical parameters of surrounding rock and pipe gallery structure

Component	$\;\rho $/(kg·m^–3)	E/GPa	$\nu$	$\sigma_{\rm{t}}$/MPa	$q_\varphi$	$K_\varphi$	$\psi $
Surrounding rock	2 100	4	0.3	0.001	0.21	21 119	0
Pipe gallery structure	2 600	30	0.2	2.000	0.60	7.18 × 10⁶	0

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表 2 甲烷-空气混合气体高能燃烧模型计算参数

Table 2. Calculation parameters of high-energy combustion model of methane-air mixture

Component	$\gamma $	E₀/(MJ·m^–3)	$\;\rho $/(kg·m^–3)	D/(m·s^–1)	V_f/%	p_CJ/MPa
CH₄-Air	1.282	3.775	1.19	2 785	9.5	1.9

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表 3 数值模拟验证结果

Table 3. Numerical simulation verification results

Position/m	Pressure/kPa		$\delta $/%	Position/m	Pressure/kPa		$\delta $/%
Position/m	Experiment	Simulation	$\delta $/%	Position/m	Experiment	Simulation	$\delta $/%
20	145.33	153.68	5.75	200	147.33	164.32	11.53
60	165.67	180.32	8.84	280	137.67	148.02	7.52
80	169.67	181.94	7.23	340	136.00	147.61	8.54
120	154.00	169.21	9.88	380	129.00	145.27	12.61

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