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Gold Science and Technology ›› 2022, Vol. 30 ›› Issue (4): 612-622.doi: 10.11872/j.issn.1005-2518.2022.04.025

• Mining Technology and Mine Management • Previous Articles    

Numerical Simulation of Dynamic Response of Tunnel Lining Under Oil Tank Explosion

Zhanxing ZHOU(),Kewei LIU(),Xudong LI,Xiaohui HUANG,Sizhou MA   

  1. School of Resources and Safety Engineering，Central South University，Changsha 410083，Hunan，China
  • Received:2022-01-21 Revised:2022-05-16 Online:2022-08-31 Published:2022-10-31
  • Contact: Kewei LIU E-mail:zzx1230@csu.edu.cn;kewei_liu@126.com

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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

CLC Number: 

  • TE834

Fig.1

Explosion loading-time history curve"

Fig.2

Calculation and loading of explosion load"

Fig.3

Dimensions of tunnel cross section"

Fig.4

Model of numerical calculation"

Fig.5

Division of subareas and distribution of measurement points"

Fig.6

Equation curve of state of the H-J-C model"

Table 1

Calculation parameters of H-J-C model"

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 440μc体积应变0.001G/GPa剪切模量14.86
fc/MPa单轴抗压强度48K1/GPa压力常数85D1损伤常数0.04
A黏性强度系数0.79K2/GPa压力常数-171D2损伤常数1.0
B压力硬化系数1.6K3/GPa压力常数208EFMIN最小塑形应变0.01
N压力硬化指数0.61pl/GPa锁定压力0.8T/MPa单轴抗拉强度4
C应变率系数0.007μl锁定体积应变0.100ε参考应变率1e-6
Pc/MPa静水压力16SMAX最大等效应力7.0fs失效参数0.004

Fig.7

Comparison between numerical simulation results and empirical formula calculation results"

Fig.8

Transverse propagation characteristics of stress wave"

Fig.9

Longitudinal propagation characteristics of stress wave"

Fig.10

Schematic diagram of measurement points on the tunnel lining"

Fig.11

Displacement response curves of lining structure"

Fig.12

Velocity response curves of lining structure"

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