مدلسازی عددی تقاطع غیر همسطح تونل های حفاری شده به روش مکانیزه | ||
| روش های تحلیلی و عددی در مهندسی معدن | ||
| مقاله 3، دوره 8، شماره 16، آبان 1397، صفحه 29-43 اصل مقاله (1.98 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.29252/anm.8.16.29 | ||
| نویسندگان | ||
| سید سعید حسینی* 1؛ سید محمد اسماعیل جلالی1؛ میثم جلالی2؛ عماد خراسانی3 | ||
| 1دانشکده مهندسی معدن، نفت و ژئوفیزیک، دانشگاه صنعتی شاهرود | ||
| 2دانشکده مهندسی عمران، دانشگاه صنعتی شاهرود | ||
| 3دانشکده مهندسی معدن، دانشگاه تهران | ||
| چکیده | ||
| با افزایش روز افزون سازههای زیرزمینی، احداث این سازهها در مجاورت یکدیگر به ویژه ساخت یک تونل جدید در نزدیکی تونل پیشین در محیط‌های شهری امری اجتناب ناپذیر خواهد بود. در بخشی از مسیر احداث قطعه شرقی- غربی تونل خط 7 متروی تهران، ماشین حفاری مکانیزه با فاصله 25/2 متر از بالای تونل انتقال پساب ابوذر عبور میکند. در مقاله حاضر جهت بررسی اندرکنش بین دو تونل، مدلسازی عددی سه‌بُعدی با استفاده از نرم‌افزار FLAC3D انجام شده است. به این منظور ابتدا فرایند حفاری مکانیزه تونل ابوذر مدلسازی شده، سپس اثر حفر مرحلهای تونل متروی خط 7 بر سیستم نگهداری تونل ابوذر بررسی شده است. تاریخچه تغییرات نیروهای داخلی، لنگرهای خمشی و تغییر مکان‌های سازه پوشش تونل ابوذر ارائه شده و مورد بررسی قرار گرفته است و توصیههای مهندسی در تحلیل تونلهای متقاطع غیر همسطح ارائه شده است. نتایج حاصل از مدلسازی نشان میدهد که پس از حفاری تونل مترو، سیستم نگهداری تونل ابوذر به دلیل افزایش ناحیه پلاستیک و آزاد سازی تنش، به سمت بالا جابجا خواهد شد. این جابجایی سبب ایجاد نیروهای داخلی بیش از مقادیر مجاز طراحی شده در لاینینگ تونل ابوذر خواهد شد. | ||
| کلیدواژه‌ها | ||
| تقاطع غیر همسطح تونل‌ها؛ اندرکنش تونل‌ها؛ تونل خط 7 متروی تهران؛ تونل ابوذر؛ پایداری سیستم نگهداری | ||
| عنوان مقاله [English] | ||
| Numerical investigation of mechanized shield tunnels cross-cut | ||
| نویسندگان [English] | ||
| Seyed Saeed Hosseini1؛ Seyed Mohammad Esmail Jalali1؛ Meysam Jalali2؛ Emad Khorasani3 | ||
| 1Dept. of Mining, Geophysics & Petroleum Shahrood University of Technology, Iran | ||
| 2Dept. of Civil Engineering, Shahrood University of Technology, Shahrood, Iran | ||
| 3Dept. of Mining, University of Tehran, Iran | ||
| چکیده [English] | ||
| Summary In parts of constructing east-west section of line7 Tehran subway, the excavating machine (EPB-TBM) passes from the top of the Abouzar’s wastewater conveyance tunnel with clear distance of 2.25 m. The FLAC 3D has been used to model this problem and find the deformations and forces of ground and linings. The modeling results showed that after excavating subway tunnel, lining of Abouzar tunnel will move upward due to the increasing plastic zones and stress relaxation. This rate of displacement induced the internal force more than allowable designed amount in concrete lining of Abouzar tunnel. Introduction Generally, excavating a tunnel near another tunnel may lead to significant interaction effects, which mainly depends on tunnels position relative to each other (parallel or cross), the distance between two tunnels, tunnel dimensions, lining rigidity, stress and boring environment condition as well as the method of tunnel boring. The interaction between adjacent tunnels have been investigated by different researchers using methods such as analytical and empirical, field observation, physical modeling and numerical modeling. In the current project, the tunnel of Tehran metro line7 passes with a distance of 2.25 meters from the top of the Abouzar tunnel. Because of the three-dimensional nature of the interaction problem between underground spaces, numerical modeling is an appropriate tool for the analysis of these complicated problems. Therefore, FLAC3D software has been used in order to investigate the interaction analysis. The purpose of modeling is to study stability of support system of Abouzar tunnel during tunnel excavation of Tehran metro line7. Methodology and Approaches In this paper, the finite difference method (FDM) is used for modeling and solving the problem. FLAC 3D program which uses FDM was selected in order to study the interaction between the two tunnels, in construction stage. For this purpose, at first Abouzar tunnel modeled and excavated, then impact of stepwise excavating of line7 Tehran subway on lining system of Abouzar tunnel is investigated numerically. History of Internal forces, bending moments and structural displacement of Abouzar’s tunnel lining have been provided and studied. Engineering recommendations have been proposed in different-leveled intersecting tunnels. Results and Conclusions The results of the modeling showed that after excavation of metro tunnel, the support system of Abouzar tunnel will be uplifted because of increasing plastic zone and stress relaxation. This displacement causes internal forces in Abouzar tunnel lining which are more than allowed values. | ||
| کلیدواژه‌ها [English] | ||
| Tunnels cross-cut, Tunnels interaction, Tehran Metro L7, Abouzar Tunnel, Stability analysis of tunnel linings | ||
| مراجع | ||
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[1] Cooper, M. L., Chapman, D. N., Rogers, C. D. F. & Chan, A. H. C. (2002). Movements in the Piccadilly Line tunnels due to the Heathrow Express construction. Geotechnique 52, No. 4, 243–257. [2] Liao, S. M., Liu, J. H., Wang, R. L. & Li, Z. M. (2009). Shield tunneling and environment protection in Shanghai soft ground. Tunnelling and Underground Space Technology 24, pp.454-465. [3] Kim, S.H. (1996). Model testing and analysis of interactions between tunnels in clay. PhD thesis,Department of Engineering Science, University of Oxford. [4] Lim, S. (2012). Three dimensional centrifuge and numerical modeling on effects of construction sequences on perpendicularly crossing tunnels. Phd thesis. Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology. [5] Liu, H. Y., Small, J. C., Carter, J. P. & Williams, D. J. (2009). Effects of tunnelling on existing support systems of perpendicularly crossing tunnels. Computers and Geotechnics 36, No. 5,pp. 880-894. [6] Li, P., Du, S. (2012). Responses of Cross-River Tunnel due to Overlying Shield Tunnel Construction (Ⅰ): Influence of Construction Procedure. ICPTT 2012: pp. 1585- 1594. [7] Razi, A.M. and Shahriar, K. (2014). Numerical modeling of two tunnels cross-cut using FLAC3D software, Case Study: line 6 and 7 of Tehran Metro. 10th national conference tunnel. Tehran, Iran. (in Persian) [8] Maadikhah, A. and Zare, Sh. (2012). The investigation into the effect of tunnel excavation of Tehran metro line 7 on East sewage tunnel. 9th national conference tunnel, Tehran, Iran. [9] Chakeri, H., Hasanpour, R., Mehmet, A. H., Bahtiyar, U. (2011). Analysis of interaction between tunnels in soft ground by 3D numerical modeling. Bull Eng Geol Environ, page 439–448. (in Persian) [10] Sahel Consultant Engineers. (2009). The report of geometric design of the east-west lot of Tehran metro line 7. Tehran. (in Persian) [11] Khakrizab Engineering Co. (2009). The report of implementation method-engineering services of auxiliary tunnel of Abuzar channel. Tehran. (in Persian) [12] Sahel Consultant Engineers. (2010). The report of Geological Engineering and Geotechnics of the east-west lot of Tehran metro line 7. Tehran. (in Persian) [13] Federal Highway Administration. (2009). Technical Manual for Design and Construction of Road Tunnels. FHWA-NHI-09-01. U.S. [14] American Concrete Institute (ACI). (1999). Mannual of Concrete Practice (MCP). [15] Japan Society of Civil Engineers (JSCE). (2006). Standard specifications for tunneling. [16] V. Guglielmetti,P. Grasso, A. Mahtab and S. Xu. (2007). Mechanized Tunnelling in Urban Area, published by Taylor and Francis Group. [17] O.Y. Ezzeldine, A.A. Darrag. (2006). Instrumentation at the CWO Crossing – El Azhar Road Tunnels and its use in the Design of Future Projects. Utilitization of underground space in urban areas International Symposium, Egept. | ||
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