مطالعه عددی تأثیر دیوار دیافراگمی در کاهش نشست‌های ناشی از تونل‌سازی مکانیزه

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه تربیت مدرس، تهران، ایران.

2 گروه مکانیک خاک و پی، دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران، ایران

چکیده

جابه‌جایی­‌های ناشی از حفاری تونل در سطح و عمق زمین در صورت عدم کنترل می‌­تواند برای سازه­‌های سطحی و زیرساخت­‌های شهری خطرآفرین باشد. از این ­رو، در هنگام تونل­‌سازی در محیط شهری از روش‌­های متنوعی برای کاهش نشست­‌ها استفاده می‌­شود. یکی از این روش‌­ها، استفاده از دیوار دیافراگمی است. در این مطالعه تأثیر استفاده از دیوار دیافراگمی در کاهش جابه‌جایی‌­های ناشی از حفاری تونل متروی مادرید با حضور لایه ضخیم خاک دستی بررسی گردیده ­است. برای این منظور حفاری مکانیزه تونل متروی مادرید به صورت گام به گام و سه بعدی در نرم‌­افزار المان محدود آباکوس مدل‌­سازی گردیده­ است. در این مدل­‌سازی­‌ها مولفه‌­های مختلف TBM یعنی فشار اعمالی به جبهه کار، تزریق دوغاب در پشت سگمنت‌­ها، اضافه ­حفاری ناشی از اختلاف قطر کله­ حفار و سپر در نظر گرفته شده ­است. دیوار دیافراگمی نیز به صورت سه بعدی مدل­‌سازی گردیده ­است. پارامترهای متغیر این مطالعه مدول الاستیسته دیوار، طول دیوار، زبری بین دیوار و خاک، فاصله دیوار از محور تونل و دانسیته دیوار است. نتایج مطالعه نشان می‌­دهد در بین پارامترهای مختلف تأثیرگذار، مدول الاستیسیته دیوار و فاصله آن از محور تونل بیش­ترین تأثیر را در کنترل نشست‌­های قائم و جابه‌جایی­‌های افقی ناشی از حفاری تونل داشته ­است. هم­چنین دیوار با فاصله0/7D از محور تونل و طول نفوذ 0/5D یا C+1D می‌­تواند دیوار دیافراگمی ‌بهینه در این پروژه باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical Study of using Diaphragm Wall to Mitigate Mechanized Tunneling Induced Settlements

نویسندگان [English]

  • Mojtaba Shirzehhagh 1
  • Mohammad Oliaei 2
1 Tarbiat Modares University, Tehran, Iran
2 Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran.
چکیده [English]

Tunneling-induced displacements could be dangerous for surface structures and urban infrastructure, if not controlled. Accordingly, different techniques are carried out to mitigate tunneling-induced displacements. In this regard, using a diaphragm wall is a practical technique. In this study, the effect of using a diaphragm wall for mitigating the Madrid metro tunneling-induced displacements was investigated. Despite mechanized tunneling of the Madrid metro extension, there is considerable settlement due to a thick layer of made soil ground. In this regard, TBM-EPB tunneling of the Madrid metro tunnel has been modeled step by step and three-dimensional in the finite element code of ABAQUS. The main construction aspects of a TBM are modeled, such as the face pressure, the injection of grout behind the segments, the overcut produced by the gap between the diameters of the cutter-head and the shield. The diaphragm wall is also modeled three-dimensional. For the parametric study, the elastic modulus of the wall, length of the wall, friction between the wall and soil, the distance of the wall from the tunnel axis and density of the wall are assumed to be variable. The results show the elastic modulus of the wall and the distance of the wall from the tunnel axis are the most effective parameters in mitigating the tunneling induced surface settlements and horizontal displacements. In the distance of 0.7D between the wall and tunnel axis, a wall of 0.5D or C+1D length could be the optimum option to mitigate the settlements. 

کلیدواژه‌ها [English]

  • Mechanized Tunneling
  • Diaphragm Wall
  • Settlements
  • TBM
  • Numerical Modeling

مراجع

[1] Khalaj Zadeh, M. H., Azadi, M. 2019. The effects of tunnel excavation on the seismic response of ground surface using finite difference method. Amirkabir J. Civil Eng. 51(1), 99-108. (in Persian).
[2] Nikakhtar, L., Zare, S., Mirzaei Nasirabad, H. 2020. Global Sensitivity Analysis in the Surface Settlement Prediction Caused by Mechanized Tunneling. Amirkabir J. Civil Eng. (in Persian).
[3] Faraj Mohammadieh, M., Behnamfar, F., Mohammadi, S. J. 2020. Effects of Urban Tunnel Excavation in Tehran in Response to Existing Static and Dynamic Structures in Terms of Soil And Structure Interaction. Amirkabir J. Civil Eng. (in Persian).
[4] Farrokh, F. 2020. Face Pressure Evaluation in Serviceability Limit State. Amirkabir J. Civil Eng. (in Persian).
[5] Rezaei, A., Shirzehhagh, M., Baghban Golpasand, M. R. 2019. EPB tunneling in cohesionless soils: A study on Tabriz Metro settlements. Geomechanics and Engineering. 19(2), 153-165.
[6] Rezaei Farei, A., Katebi, H., Shirzehhagh, M. 2019. A Numerical Parametric Study on the Effects of Surface Structure on Tunneling Induced Settlements. Transportation Infrastructure Engineering, Semnan University. (in Persian).
[7] Rezaei, A. H., Shirzehhagh, M. 2020. Determination of Face Pressure in EPB Tunneling Applying Empirical, Analytical and Numerical Methods (Case Study: Tabriz Underground Railway). Journal of Civil and Environmental Engineering, Tabriz University. 49(4), 21-32. (in Persian).
[8] Lambrughi, A., Medina Rodriguez, L. Castellanza, R. 2012. Development and validation of a 3D numerical model for TBM-EPB mechanized excavation. Computers and Geotechnics. 40, 97-113.
[9] Rezaei Farei, A. R., Shirzehhagh, M., Katebi, H. 2018. M‌echanized T‌unneling-Induced S‌sttlements in Urban E‌‌nvironment: the C‌ase S‌study of Tabriz U‌nderground Railway. Sharif Journal of Civil Engineering. 35(2), 131-140. (in Persian).
[10] Pourreza, V. 2017. A Numerical Study & Economical Comparison of Mitigating Tunneling-Induced Ground Settlements in Urban Areas Using Piles and Micropiles. MSc Thesis. Tabriz University. (in Persian).
[11] Moller, S. 2006. Tunnel Induced Settlements and Structural Forces in Linings. PhD thesis. University of Stuttgart.
[12] Kasper, T., Meschke, G., 2006. A numerical study of the effect of soil and grout material properties and cover depth in shield tunnelling. Computers and Geotechnics. 33, 234–247.
[13] Fargnoli, V., Boldini, D., Amorosi, A. 2015. Twin tunnel excavation in coarse grained soils: Observations and numerical back-predictions under free field conditions and in presence of a surface structure. Tunnelling and Underground Space Technology. 49, 454–469.
[14] Novozhenin, S.U., Vystrchil, M.G. 2016. New Method of Surface Settlement Prediction for Saint-Petersburg Metro Escalator Tunnels Excavated by EPB TBM. Procedia Engineering. 150, 2266 – 2271.
[15] Kastner, R., Kjekstad, O., Standing, J. 2003. Avoiding damage caused by soil structure interaction: lessons learnt from case histories. Chapter5: Tunnelling-induced ground movements and damage. ICE Virtual Library.
[16] Cucino, P., Fucco, S., Maniezzo, D. 2010. Study for the Compensation Grouting: The Case of the Underground Railway of Florance. World Telecommunication Congress (WTC).
[17] Zhang, L., Wu, X., Liu, H. 2016. Strategies to Reduce Ground Settlement from Shallow Tunnel Excavation: A Case Study in China. J. Constr. Eng. Manage. 142-155.
[18] Mariano, D. A., Gens, A., Gesto, J., 2007. Ground deformation and mitigating measures associated with the excavation of new metro line. Geotechnical Engineering in Urban Environments. 1901-1906.
[19] Bilotta, E., Bitetti, B., McNamara, A. M., Taylor, R. N. 2006. Micropiles to reduce ground movements induced by tunneling. Physical Modeling in Geotechnics. 1139–1144.
[20] Bilotta, E., Russo, G., Viggiani, C. 2006. Numerical study of a measure for mitigating ground displacements induced by tunneling. Geotechnical Aspects of Underground Construction in Soft Ground. 357–362.
[21] Bilotta, E. 2008. Use of diaphragm walls to mitigate ground movements induce by tunneling. Geotechnique. 58(2), 143–155.
[22] Fantera, L., Rampello, S., Masini, L. 2016. A mitigation technique to reduce ground settlements induced by tunnelling using diaphragm walls. Procedia Engineering. 158, 254-259.
[23] Hafezi Moghaddas, N., Nicudel, M. R., Ghezi A. 2012. Evaluation of Man-Made Soil Ground Subsidence in West of Mashhad City. 6(1), 1373-1386. (in Persian).
[24] Tonks, D., Antonopoulos, I. 2015. Construction risks on soft ground. Proceedings of the 12th ANZ Conference on Geomechanics. Wellington, New Zealand.
[25] Tonks, D., Gallagher, E., Nettleton, I. 2017. Grounds for concern: geotechnical issues from some recent construction cases. Proceedings of the Institution of Civil Engineers - Forensic Engineering. 170(4), 157-164.
[26] Charles, J. A. 2008. The engineering behaviour of fill materials: the use, misuse and disuse of case histories. Géotechnique. 58(7), 541-570.
[27] Giordanelli, D., Levick, T., Pitcher, J. 2016. Foundation Works Risk Assessment: Stafford Western Access Route. Amey Consulting, London. UK.
 [28] Katebi, H., Rezaei, A.H., Hajialilue-Bonab, M. Tarifard, A. 2015. Assessment the influence of ground stratification, tunnel and surface buildings specification on shield tunnl lining loads (by FEM). Tunnelling and Underground Space Technology. 49, 67-78.
[29] Loganathan, N. 2011. An Innovative Method for Assessing Tunnelling-Induced Risks to Adjacent Structures. First Printing. Parsons Brinckerhoff Inc. New York, US.
[30] Guglielmetti, V., Grasso, P., Mahtab, A. and Xu, S. 2008. Mechanized Tunnelling in Urban Areas: design methodology and construction control. Taylor & Francis Group. London, UK.
[31] Jozefiak, K., Zbiciak, A., Maslakowski, M., Piotrowski, T. 2015. Numerical modelling and bearing capacity analysis of pile foundation. Procedia Engineering. 111, 356-363.
[32] Comodromos, E. M., Papadopoulou, M. C., Konstantinidis, G. K. 2013. Effects from diaphragm wall installation to surrounding soil and adjacent buildings. Computers and Geotechnics. 53, 106-121.
نشریه مهندسی عمران امیرکبیر
دوره 53، شماره 12
اسفند 1400
صفحه 5155-5174

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