Effects of groundwater table on buried pipeline response to a surface explosion

Document Type : Research Article

Authors

Department of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran

Abstract

Groundwater table is a fluctuating factor changing soil structure and affecting pipes' response to any load, such as an explosion. After validation with the results of previous studies, several numerical models were elaborated with ten different groundwater levels and two states of (1) Empty, (2) Pressurized for a buried pipe to investigate this for an explosion load. These simulations were solved by a Finite Element Method (FEM) solver. This research only studies the effects of non-cohesive soils and neglects the semi-saturated part of the soil for simplicity. The pipe's effective stress and plastic strain in each scenario were studied. The results state that the most critical scenario is when the water table is around the pipe crown, whether the pipe is empty or pressurized, with considerable excess stress compared to the absence of groundwater table. The deformation mode is also hugely affected by the water table, changing from local, forming a dent, to non-local. The internal pressure of the pipe also considerably reduces the pipe stresses and strains whether the surrounding soil is saturated or dry. Such results are certainly impactful in efficiently designing buried pipelines, which most existing guidelines and codes have not considered.

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References

References:
1.Lu, Y., Wang, Z., and Chong, K. “A comparative study ofburied structure in soil subjected to blast load using 2D and 3D numerical simulations”, Soil Dynamics and EarthquakeEngineering, 25(4), pp. 275–288 (2005). https://doi.org/10.1016/j.soildyn.2005.02.007.
2.Fiserova, D. “Numerical analysis of buried mine explosionswith emphasis on effect of soil properties on loading”, PhDThesis (2006).
3.Olarewaju, A.J., Kameswara Rao, N.S.V, and Mannan, M. A. “Blast effects on underground pipes”, Electronic Journal ofGeotechnical Engineering, 15, pp. 645–658 (2010).
4.Song, K., Long, Y., Ji, C., et al. “Experimental and numericalstudies on the deformation and tearing of X70 pipelinessubjected to localized blast loading”, Thin-Walled Structures,107, pp. 156–168 (2016). https://doi.org/10.1016/j.tws.2016.03.010.
5.Guo, Y., Liu, C., Wang, D., et al. “Numerical study and safetyspacing of buried parallel gas pipelines: a study based on TNT equivalent method”, International Journal of Pressure Vesselsand Piping, 168, pp. 246–257 (2018). https://doi.org/10.1016/j.ijpvp.2018.11.002.
6.Tang, Q., Jiang, N., Yao, Y., et al. “Experimental investigationon response characteristics of buried pipelines under surfaceexplosion load”, International Journal of Pressure Vessels and Piping, 183, 104101 (2020). https://doi.org/10.1016/j.ijpvp.2020.104101.
7.Tang, Q., Jiang, N., Yao, Y. et al. “Safety assessment of buriedgas pipeline subject to surface explosion: A case study inWuhan, China”, Eng Fail Anal, 120, 105119 (2021). https://doi.org/10.1016/j.engfailanal.2020.105119.
8.Telichenko, V., Rimshin, V., Eremeev, V. et al. “Mathematicalmodeling of groundwaters pressure distribution in theunderground structures by cylindrical form zone”, In MATECWeb of Conferences, EDP Sciences, 196, 02025 (2025). https://doi.org/10.1051/matecconf/201819602025.
9.Zhang, J., Zhang, L., and Liang, Z. “Buckling failure of aburied pipeline subjected to ground explosions”, ProcessSafety and Environmental Protection, 114, pp. 36–47 (2018).https://doi.org/10.1016/j.psep.2017.11.017.
10.Zhang, L. and Yang, X. “Soil-tunnel interaction under medium internal blast loading”, Procedia Eng, 143, pp. 403–410(2016). https://doi.org/10.1016/j.proeng.2016.06.051.
11.Lee, W.Y. “Numerical modeling of blast-inducedliquefaction”, Brigham Young University (2006).
12.Jayasinghe, L.B., Thambiratnam, D.P., Perera, N., et al.“Computer simulation of underground blast response of pile in saturated soil”, Comput Struct, 120, pp. 86–95 (2013). https://doi.org/10.1016/j.compstruc.2013.02.016.
13.Lee, E.L., Hornig, H.C., and Kury, J.W. “Adiabatic expansionof high explosive detonation products”, Univ. of CaliforniaRadiation Lab. at Livermore, Livermore, CA (United States)(1968).
14.Hallquist, J.O. “LS-DYNA theory manual”, LivermoreSoftware Technology Corporation, 3, pp. 25–31 (2006).
15.Lewis, B.A. “Developing and Implementing a Road SideSafety Soil Model into LS-DYNA”, FHWA Research andDevelopment Turner-Fairbank Highway Research Center(1999).
16.Saleh, M. and Edwards, L. “Evaluation of soil and fluidstructure interaction in blast modelling of the flying plate test”,Comput Struct, 151, pp. 96–114 (2015). https://doi.org/10.1016/j.compstruc.2015.01.010.
17.Hallquist, J.O. “LS-DYNA keyword user’s manual”,Livermore Software Technology Corporation, 970, pp. 299–800 (2007).
18.Yan, S., Xu, Y.R., and Chang, H.Y. “Numerical simulation ofdynamic response of buried pipeline by ground explosion”, InEarth and Space 2012: Engineering, Science, Construction,and Operations in Challenging Environments, 2012, pp. 1159–1166 (2012). https://doi.org/10.1061/9780784412190.126.
19.Souli, M., Olovsson, L., and Do, I. “ALE and fluid-structureinteraction capabilities in LS-DYNA”, In 7th InternationalLS-DYNA Users Conference, Dearborn, Michigan (2002).
20.Zhang, R., Jia, J., Wang, H., et al. “Shock response analysisof a large LNG storage tank under blast loads”, KSCE Journalof Civil Engineering, 22(9), pp. 3419–3429 (2018). https://doi.org/10.1007/s12205-017-1246-x.
21.Zhang, L., Liang, Z., and Zhang, J. “Mechanical response of aburied pipeline to explosion loading”, Journal of FailureAnalysis and Prevention, 16(4), pp. 576–582 (2016). https://doi.org/10.1007/s11668-016-0121-2.
22.Mokhtari, M. and Nia, A.A. “A parametric study on themechanical performance of buried X65 steel pipelines undersubsurface detonation”, Archives of Civil and MechanicalEngineering, 15(3), pp. 668–679 (2015). https://doi.org/10.1016/j.acme.2014.12.013.
23.Zhang, X.L., Mi, Y.M., Ji, T., et al. “Study on the dynamicbehaviors of X70 pipeline steel by numerical simulation”, InAdvanced Materials Research, Trans Tech Publ, pp. 278–281(2010). https://doi.org/10.4028/www.scientific.net/AMR.97-101.278.
24.Wang, Y.-G., Liao, C.C., Wang, J.-H., et al. “Dynamicresponse of pipelines with various burial depth due tounderwater explosion”, Ocean Engineering, 164, pp. 114–126(2018). https://doi.org/10.1016/j.oceaneng.2018.06.045.
Scientia Iranica
Volume 32, Issue 7
Transactions on Civil Engineering
March and April 2025 Article ID:6559

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History

  • Receive Date: 23 April 2022
  • Revise Date: 06 September 2022
  • Accept Date: 03 September 2023

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