مدل‌سازی بالازدگی تونل و شریان‌های حیاتی در زمین های مستعد روانگرایی تحت بار لرزه‌ای

نوع مقاله : پژوهشی

نویسندگان

1 دانشگاه ملایر

2 دانشگاه علوم و تکنولوژی میزوری

چکیده

در بسیاری از زلزلۀ های اخیر آسیب های گسترده ای به تونل های شهری و خارج شهری وارد آمده است. یکی از عوامل بسیار مخرب در این زلزلۀ ها، پدیدۀ روانگرایی خاک می‌ باشد. روانگرایی باعث کاهش تنش مؤثر و درنتیجه کاهش مقاومت برشی می شود و این موضوع موجب ایجاد تغییر شکل های بزرگ در خاک و ساز مدفون در آن می‌گردد. روانگرایی موجب جوشش خاک، گسترش عرضی، فرونشست ساز و بالازدگی ساز مدفون می شود. در بسیاری از زلزلۀ ها بالازدگی به‌علت روانگرایی خاک اطراف ساز به‌عنوان یکی از عوامل مخرب بر تونل‌ها و ساز‌های مدفون گزارش شدۀ است. در این پژوهش رفتار تونل در زمین‌های مستعد روانگرایی مدل‌سازی شدۀ است. از تحلیل تفاضل محدود دوبعدی برای مدل‌سازی آزمایش سانتریفیوژ استفاده گردیده است. مدل رفتاری ماسۀ UBC برای مدل‌سازی رفتار ماسۀ مستعد روانگرایی در نظر گرفته شدۀ است. نتایج مدل‌سازی با اندازه‌گیری‌های صورت گرفته در آزمایش سانتریفیوژ مقایسه گردیده است و توانایی مدل برای ارزیابی پدیدۀ روانگرایی در اطراف تونل‌ها مورد ارزیابی قرار گرفته است.

کلیدواژه‌ها


عنوان مقاله [English]

Numerical Modeling of Tunnels and Lifelines in Liquefiable Grounds Under Seismic Loading

نویسندگان [English]

  • َAli Reza Bagherieh 1
  • Iman Loloei 1
  • Amirhossein Bagherieh 2
1 Malayer University
2 Missouri University of Science and Technology
چکیده [English]

Earthquakes could have catastrophic impacts on tunnels and buried structures. Liquefaction phenomenon is one of the most destructive effects of earthquakes. Liquefaction results in decreasing effective stress and this consequently leads to decreases in shear strength of the soil. As a result, large deformation in both soil and buried structure occurs. Moreover, liquefaction causes soil boiling, lateral spreading, structure settlement and the uplift of buried structure. In many earthquake cases, uplift of the buried structure due to liquefaction was reported as one of the major damaging factors. This research sought to model earthquake induced uplift of buried structures including tunnels in the soil susceptible to liquefaction under seismic loading. Two dimensional finite difference modeling is employed to simulate centrifuge experiments. The UBCSAND model was adopted as constitutive model in numerical simulations. The modeling results are compared with the measurements of centrifuge experiment and the capabilities of the model to predict the liquefaction of soil around tunnels are assessed.

کلیدواژه‌ها [English]

  • Lifeline
  • Tunnel
  • Liquefaction
  • Uplift
  • Earthquake
  • Centrifuge Tes
1. O’Rourke, T.D., Gowdy, T.E., Stewart, H.E. and Pease, J.W. "Lifeline and geotechnical aspects of the 1989 Loma Prieta Earthquake," Proceedings of 2nd International onference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics, University of Missouri-Rolla, MO, pp. 1601–1612,(1991)
2. Shengcong, F., and Tatsuoka, F., "Soil Liquefaction DuringHaicheng and Tangshan Earthquake in China; A Review," Soils and Foundations, Vol. 24, No. 4, pp 11-29, (1984).
3. EQE summary report. The January 17. 1995 Kobe earthquake. EQE International;(1995)
4. Scawthorn C, Yanev PI., "Preliminary report 17 January 1995, Hyogo-ken Nambu, Japanese earthquake". Engineering Structures ;Vol. 17, No.3, pp. 146-157, ( 1995).
5. Chen, WW, Shih BJ,Wu CW, Chen YC. "Natural gas pipeline system damages in the Ji-Ji earthquake (The City of Nantou)". In: Proc of the 6th international conf on seismic zonation. (2000).
6. Jefferies, M, Been, K., "Soil Liquefaction: A Critical State Approach", Second Edition, CRC Press, (2015).
7. S.C. Chian, S.P.G. Madabhushi. "Effect of buried depth and diameter on uplift of underground structures in liquefied soils" Soil Dynamics and Earthquake Engineering, vol. 41, pp 181–190,(2012)
8. Fugro (2008). "Final Report, No-Densification Assessment Offshore Transbay Tube (TBT) Seismic Retrofit Project", prepared for Bechtel Infrastructure Corporation, BART Earthquake Safety Program, July (2008).
9. Hall,W.J. and O’Rourke. "Seismic behavior and vulnerability of pipelines," LifelineEarthquake Engineering, Cassaro (ed.), ASCE, pp. 761–773,(1991).
10. Tobita, T., Iai, S., Kang, G. C. and Konishi, Y. "Observed damage of wastewater pipelines and estimated manhole uplifts during the 2004 Niigataken Chuetsu, Japan, earthquake," Proc. Technical Council on Lifeline Earthquake Engineering Conference, California, (2009).
11. Koseki, J., Matsuo, O., Ninomiya, Y., Yoshida, T., "Uplift of Sewer manholesduring the 1993 Kushiro-oki earthquake". Soils and Foundations, vol. 37, pp. 109–121,( 1997).
12. Towhata I. Geotechnical earthquake engineering. Berlin: Springer; (2008).
13. Ghayamghamian, MR, Tobita, T, Iai, S, Kang, GC. "Reconnaissance report of July 16, Niigata-ken Chuetsu-oki Japan earthquake", Journal of Seismology and Earthquake Engineering ,vol. 9, No. 1-2, pp.73–84, (2007).
14. Geoengineering Extreme Events Reconnaissance (GEER) Association, Geoengineering reconnaissance of the 2010 Maule, Chile earthquake, Report ofthe NSF Sponsored GEER Association Team, (2010).
15. Chian SC, Tokimatsu K. Floatation of underground structures during theMw9.0 Tohoku earthquake of 11th March 2011. In: Proceedings of the15thworld conference on earthquake engineering. Lisbon; (2012).
16. Tokida, K., Ninomiya, Y. and Azuma, T. "Liquefaction Potential and Uplift Deformation of Underground Structure" , In :Brebbia C. A.(Ed), "Soil Dynamics and Earthquake Engineering" VI, WIT Press, pp. 365-379, (1993).
17. Yasuda, S., Nagase, H., Itafuji, S., Sawada, H. and Mine, K. "Shaking Table Tests on Floatation of Buried Pipes due to Liquefaction of Backfill Sands." Proceedings, 5th U.S.- Japan Workshop on Earthquake Resistant Design of Lifeline Facilities and Countermeasures against Soil Liquefaction, Snowbird, UT, (1995),
18. Koseki, J., Matsuo, O. and Koga, Y. "Uplift behavior of underground structures caused by liquefaction of surrounding soil during earthquake." Soils and Foundations, vol. 37, No. 1, pp. 97-108, (1997).
19. Ichii, K., Seto, N. and Kidera, H. "Characteristics of Uplifting Velocity of a Buried Pipe in Liquefied Ground." Geotechnical Special Publication, n 181, 2008, Proceedings of the Geotechnical Earthquake Engineering and Soil Dynamics IV Congress 2008 - Geotechnical Earthquake Engineering and Soil Dynamics, GSP 181, Sacramento, CA, USA(2008).
20. Adalier, K., Abdoun, T., Dobry, R., Phillips, R., Yang, D., and Naesgaard, E. "Centrifuge Modelling for Seismic Retrofit Design of an Immersed Tube Tunnel." International Journal of Physical Modelling in Geotechnics, 23-35(2003).
21. Ling, H.I., Mohri, Y., Kawabata, T., Liu, H., Burke, C. and Sun, L.. "Centrifugal modeling of seismic behavior of large-diameter pipeline in liquefiable soil," Journal of Geotechnical and Geoenvironmental Engineering, ASCE vol. 129, No. 12, pp. 1092–1101, (2003).
22. Sasaki, T. and Tamura, K., "Prediction of Liquefaction-Induced Uplift Displacement of Underground Structures." 36th Joint Meeting US-Japan Panel on Wind and Seismic Effects, 191-198 (2004).
23. Liu, H.B. & Song, E.X., "Seismic response of large underground structures in liquei able soils subjected to horizontal and vertical earthquake excitations", Computers and Geotechnics, vol. 32, No. 4, pp. 223–244, (2005).
24. Ling, H.I., Sun, L., Liu, H., Mohri, Y., and Kawabata, T. "Finite element analysis of pipe buried in saturated soil deposit subject to earthquake loading". Journal of Earthquake and Tsunami , vol. 2, No. 1, pp. 1-17, (2008).
25. Azadi, M. and Mir Mohammad Hosseini, S.M. "The Uplifting Behavior of Shallow Tunnels within the Liquefiable Soils under Cyclic Loadings." Tunnelling and Underground Space Technology, V 25(2), 158-167. (2010).
26. Saeedzadeh, Hataf. "Uplift response of buried pipelines in saturated sand deposit under earthquake loading", Soil Dynamics and Earthquake Engineering, vol. 31,No. 10, pp. 1378-1384, (2011).
27. Sun, L., "Centrifuge modeling and finite element analysis of pipelines buried in liquifiable soils", Ph. D. thesis, Columbia University, (2001).
28. Arulmoli, K., Muraleetharan, K. K., Hosain, M. M. and Fruth, L. S. "VELACS Laboratory Testing Program, Soil Data Report." The Earth Technology Corporation, Irvine, California, Report to the National Science Foundation(1992).
29. Beaty, Michael , Byrne, P., "UBCSAND CONSTITUTIVE MODEL Version 904aR. UBCSAND Constitutive Model on Itasca UDM Web Site", February, (2011).
30. Chou Jui-Chingm "Centrifuge Modeling of the BART Transbay Tube and Numerical Simulation of Tunnels in Liquefying Ground" PhD thesis Davis University (2010).
31. Park, S.-S., and Byrne, P.M.. Stress densification and its evaluation. Canadian Geotechnical Journal, 41: 181–186,(2004).
32. Cundall et al. “Fast Lagrangian Analysis of Continua Manual”, Online Manual, Itasca Engineering Consulting Minnesota usa,(2001).
33. Casagrande, A., “Liquefaction and Cyclic Deformation of Sand-A critical review”, 5th Pan American Conference on Soil Mechanics and FoundationEngineering, Buenos Aires, Argentina, (1975)
34. Marandi, S.M. and Rasti, A.R., "Parameters Analysis of the Covering Soil of Tunnels Constructed In Liquefiable Soils, " International Journal of Engineering, Vol. 25, No. 4, Transactions A, , pp. 333-346, (2012)
35. Byrne, P.M., Park, S. S., Beaty, M., Sharp, M., Gonzalez, L., Abdoun T., "Numerical modeling of liquefaction and comparison with centrifuge tests", Canadian Geotechnical Journal, vol. 41, pp. 193–211, (2004)
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