油罐爆炸作用下隧道衬砌动力响应数值模拟研究

doi:10.11872/j.issn.1005-2518.2022.04.025

摘要/Abstract

摘要：

为准确分析油气爆炸下隧道及采矿巷道等地下工程的结构稳定性，采用FLACS软件计算LPG爆炸荷载，基于LS-DYNA软件将爆炸冲击荷载施加于结构表面，进而计算爆炸荷载作用下衬砌结构动力响应。研究结果表明：隧道的“角状结构”对冲击波反射具有强化作用，致使相应位置形成应力集中，应力波强度衰减缓慢，随着传播距离的增加，衬砌所受应力逐渐减小且同一截面应力值趋于一致；同一截面不同测点处的速度、位移值受爆心距和隧道几何结构的共同影响，当爆心距大于12 m时，速度和位移值变化趋于稳定；顶部衬砌和底部结构更易发生破坏，边墙位置损伤程度较小。该研究成果为地下工程安全稳定性分析提供了方法依据，也为巷道抗爆设计及支护优化提供了理论参考。

关键词: 隧道衬砌, 液化石油气, 油罐爆炸, 数值模拟, 动力响应

Abstract:

The dynamic response of underground engineering such as tunnel and mining roadway under the action of the explosion load of oil and gas is an important basis for engineering protection design and safety evaluation.The development of dynamic numerical simulation method in line with the characteristics of oil and gas explosion is of great significance for accurately analyzing the stability of underground engineering structures such as tunnel and mining roadway under liquefied petroleum gas （LPG） explosion. In this paper，fluid computational mechanics software FLACS was used to calculate the LPG explosion load in the tunnel. Based on transient dynamic analysis software LS-DYNA，the blast impact load was applied to the tunnel lining surface，and then the dynamic response of lining structure at different distances from the explosion center was calculated.By comparing the peak value of overpressure obtained by simulation with the calculation results of the empirical formula，the coincidence between the peak value of overpressure obtained by simulation and the calculation results of the empirical formula is high，which shows that the simulation method used in this paper has good applicability for analyzing the structural response of tunnel under LPG explosion in tunnel.Based on the numerical simulation results，the variation laws of stress，displacement and velocity of lining structure under LPG explosion load were studied.The results show that the “angular structure” of the tunnel has a strengthening effect on the reflection of shock wave，resulting in the formation of stress concentration at the corresponding position and the slow attenuation of the stress wave intensity.With the increase of the propagation distance，the stress on the lining decreases gradually and the stress value of the same section tends to be consistent.In addition，the velocity and displacement values at different measuring points on the same section are affected by the distance between measuring point and explosion center and the geometric structure of the tunnel.When the distance between measuring point and explosion center is larger than 12 m，the velocity and displacement values tend to be stable.The damage of top lining and bottom structure is more likely to occur under the action of blast load，and the damage degree of sidewall position is less.The research results provide a method basis for the safety and stability analysis of underground structures，and also have a certain reference value for the anti-explosion design of mining roadway structure and the corresponding support optimization in mining.

Key words: tunnel lining, liquefied petroleum gas （LPG）, oil tank explosion, numerical simulation, dynamic response

中图分类号:

TE834

周占星,刘科伟,李旭东,黄晓辉,马泗洲. 油罐爆炸作用下隧道衬砌动力响应数值模拟研究[J]. 黄金科学技术, 2022, 30(4): 612-622.

Zhanxing ZHOU,Kewei LIU,Xudong LI,Xiaohui HUANG,Sizhou MA. Numerical Simulation of Dynamic Response of Tunnel Lining Under Oil Tank Explosion[J]. Gold Science and Technology, 2022, 30(4): 612-622.

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参数	含义	取值	参数	含义	取值	参数	含义	取值
ρ₀/（kg?m^-3）	密度	2 440	μ_c	体积应变	0.001	G/GPa	剪切模量	14.86
f_c/MPa	单轴抗压强度	48	K₁/GPa	压力常数	85	D₁	损伤常数	0.04
A	黏性强度系数	0.79	K₂/GPa	压力常数	-171	D₂	损伤常数	1.0
B	压力硬化系数	1.6	K₃/GPa	压力常数	208	EFMIN	最小塑形应变	0.01
N	压力硬化指数	0.61	p_l/GPa	锁定压力	0.8	T/MPa	单轴抗拉强度	4
C	应变率系数	0.007	μ_l	锁定体积应变	0.100	ε	参考应变率	1e-6
P_c/MPa	静水压力	16	SMAX	最大等效应力	7.0	f_s	失效参数	0.004

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