مقایسه عددی سه‌بعدی رفتار رادیه‌های- ریزشمع‌دار در بارگذاری‌های استاتیکی مونوتونیک محوری فشاری

نوع مقاله : یادداشت پژوهشی

نویسنده

استادیار گروه مهندسی عمران، دانشکده مهندسی، دانشگاه صنعتی کرمانشاه

چکیده

در حال حاضر، استفاده از ریزشمع‌ها در تسلیح خاک و تقویت پی سازه‌ها به‌دلیل سهولت در اجرای آن‌ها نسبت به سایر انواع شالوده‌ها، اهمیت زیادی پیدا کرده ‌است. در این مقاله، نتایج مدل‌سازی‌های عددی گروه ریزشمع‌ها در خاک ‌رسی بررسی ‌شده ‌است. مدل‌سازی عددی سه‌بعدی در قالب روش تفاضل محدود صریح انجام ‌شده‌ است. فاصله‌های مختلف مرکز‌به‌مرکز گروه ریزشمع‌ها از 1 تا 3 متر در مدل‌سازی‌های پارامتری عددی منظور شده است. ظرفیت باربری گروه ریزشمع‌ها که به‌روش‌ عددی به‌دست ‌آمده، با نتایج حاصل از کاربرد روابط ‌تحلیلی در مراجع معتبر طراحی، مقایسه ‌شده ‌است. نتایج این مطالعه نشان‌ می‌دهد که روابط ‌تحلیلی موجود، ظرفیت‌ باربری محافظه‌کارانه‌ای نسبت به یافته‌های ‌عددی به‌دست می‌دهند. درواقع مقادیر تحلیلی برای بارگذاری گروه ریزشمع‌ها در انواع چیدمان‌های گروه، در اغلب موارد کوچک‌تر از نتایج عددی هستند. مقادیر نتایج تحلیلی برای کمیت ظرفیت باربری فشاری نهایی رادیه ریزشمع‌دار به‌صورت نسبی بین 90% تا 50% یافته‌های عددی متناظر است (اختلاف به‌ترتیب بین 10% تا 50%) و هر‌چه‌ تعداد ریزشمع‌ها در گروه بیشتر می‌شود (معادل کاهش فاصله بین ریزشمع‌ها در گروه)، اختلاف نتایج این دو روش نیز کمتر می‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

3D Numerical Comparison of the Behavior of Micropile-Reinforced Rafts under Monotonic Axial Compressive Static Loading

نویسنده [English]

  • Yazdan Shams Maleki
Faculty of Engineering, Kermanshah University of Technology, Kermanshah 6715685420, Iran
چکیده [English]

Seismic retrofitting of existing buildings, particularly at the foundation level, is of great importance. Various methods have been employed over the past several decades to improve and strengthen existing or aged foundations. One of the most important methods is the use of micropiles. As a significant innovation of this study, the effects of micropile spacing, the interactions among the micropiles, raft, and soil, as well as different group configurations, are explicitly considered in the three-dimensional numerical models, in contrast to the existing analytical design relationships. Furthermore, unlike analytical approaches, the design criterion adopted in this study is primarily based on the settlement performance of the numerical models. Within the framework of a research program involving three-dimensional numerical simulations using the explicit finite-difference program, the load-bearing capacity of micropile groups in clayey soil under axial compressive loading is first determined. The obtained results are then compared and correlated with those of existing analytical relationships and selected experimental findings.

کلیدواژه‌ها [English]

  • Micropile group
  • static loading
  • displacement
  • three-dimensional modeling
  • compressive loading

مراجع

Abbas Q, Choi W, Kim G, Kim I, Lee J, “Characterizing uplift load capacity of micropiles embedded in soil and rock considering inclined installation conditions”, Computers and Geotechnics, 2021, 132, 103995. https://doi.org/10.1016/j.compgeo.2020.103995
Abd Elaziz AY, El Naggar MH, “Geotechnical capacity of hollow-bar micropiles in cohesive soils”, Canadian Geotechnical Journal, 2014, 51 (10), 1123-1138. https://doi.org/10.1139/cgj-2013-0408
Abd Elaziz AY, El Naggar MH, “Group behaviour of hollow-bar micropiles in cohesive soils”, Canadian Geotechnical Journal, 2014, 51 (10), 1139-1150. https://doi.org/10.1139/cgj-2013-0409
Abdlrahem MA, Naggar MHE, “Numerical modelling of axial behaviour of single and grouped hollow bar micropiles in cohesionless soils”, Geotechnical and Geological Engineering, 2023, 41, 2105-2126. https://doi.org/10.1007/s10706-023-02393-w
Aboutabikh M, Soliman AM, El Naggar MH, “Performance of hollow bar micropiles using green grout incorporating treated oil sand waste”, Journal of Building Engineering, 2019, 1-34. https://doi.org/10.1016/j.jobe.2019.100964
Alnuaim AM, “Performance of micropiled raft in sand and clay-centrifuge and numerical studies”, The University of Western Ontario, 2014.
Alnuaim AM, El Nagger H, and El Naggar MH, “Performance of micropiled raft in sand subjected to vertical concentrated load: Centrifuge modeling”, Canadian Geotechnical Journal, 2015, 52 (1), 33-45. https://doi.org/10.1139/cgj-2014-0001
Alnuaim AM, El Naggar ME, El Naggar H, “Performance of micropiled rafts in clay: Numerical investigation”, Computers and Geotechnics, 2018, 99, 42-54. https://doi.org/10.1016/j.compgeo.2018.02.020
Borthakur N, Das M, “Predicting micropile group capacity in soft cohesive soil by artificial neural network”, Indian Geotechnical Journal, 2025, 55, 1844-1862. https://doi.org/10.1007/s40098-024-01058-6
Drbe OF, El Naggar MH, “Axial monotonic and cyclic compression behaviour of hollow-bar micropiles”, Canadian Geotechnical Journal, 2014, 52 (4), 426-441. https://doi.org/10.1139/cgj-2014-0052
Elsawwaf A, El Naggar H, “FE Simulation of Installation and Loading of Single and Group Pressure-Grouted Micropiles”, Geotechnical and Geological Engineering, 2024, 42, 6113-6130. https://doi.org/10.1007/s10706-024-02888-0
Elsawwaf M, Shahien M, Nasr A, Magdy A, “The behavior of piled rafts in soft clay: Numerical investigation”, Journal of the Mechanical Behavior of Materials, 2022, 31 (1), 426-434. https://doi.org/10.1515/jmbm-2022-0050
Ferchat A, Benmebarek S, Houhou MN, “3D numerical analysis of piled raft interaction in drained soft clay conditions”, Arabian Journal Geoscience, 2021, 14, 394. https://doi.org/10.1007/s12517-021-06783-3  
FHWA (Federal Highway Administration), “Micropile design and construction reference manual”, FHWA NHI-05-039, National Highway Institute, Federal Highway Administration, U.S. Dept. of Transportation, Washington, DC, 2005.
Golsefidi MA, Esmaeili-Falak M, Sarbaz, H, “An interpretable AI framework using XGB-POA for micropile compressive stiffness prediction”, Scientific Reports, 2026. https://doi.org/10.1038/s41598-026-60145-1
Han J, Ye S-L, “A field study on the behavior of a foundation underpinned by micropiles”, Canadian Geotechnical Journal, 2006, 43 (1), 30-42. https://doi.org/10.1139/t05-087
Han J, Ye SL, “A field study on the behavior of micropiles in clay under compression or tension”, Canadian Geotechnical Journal, 2006, 43 (1), 19-29. https://doi.org/10.1139/t05-089
Isam S, Hassan A, Mhamed S, “3D elastoplastic analysis of the seismic performance of inclined micropiles”, Computers and Geotechnics, 2012, 39, 1-7. https://doi.org/10.1016/j.compgeo.2011.08.006
Jamaleddin N, Gabr M, Borden R, Argall R, Lasser D, “Numerical study on micropile group behavior supporting fixed bottom marine hydrokinetic devices in sandy seabed”, Ocean Engineering, 2024, 293 (1), 116614. https://doi.org/10.1016/j.oceaneng.2023.116614
Kim D, Kim G, Kim I, Lee J, “Assessment of load sharing behavior for micropiled rafts installed with inclined condition”, Engineering Structures, 2018, 172, 780-788. https://doi.org/10.1016/j.engstruct.2018.06.058
Kulhawy FH, Mayne PW, “Manual on estimating soil properties for foundation design”, Report. EL-6800. Ithaca (NY): Electric Power Research Institute; 1990.
Kyung D, Kim D, Kim G, Lee J, “Vertical load-carrying behavior and design models for micropiles considering foundation configuration conditions”, Canadian Geotechnical Journal, 2017, 54 (2), 234-247. https://doi.org/10.1139/cgj-2015-0472
Misra A, Chen CH, “Analytical solutions for micropile design under tension and compression”, Geotechnical and Geological Engineering, 2004, 22 (2), 199-225. https://doi.org/10.1023/B:GEGE.0000018356.85647.79
Salisbury NG, Davidow SA, “Current design and construction practices for micropile supported foundations of electrical transmission structures in North America”, 12th Int. Workshop on Micropiles, International Society for Micropile, Eighty-Four, PA, 2014.
Mukherjee A, Borthakur N, “Settlement prediction of micropile supported raft using machine learning: modelling and performance evaluation”, Journal of Building Pathology and Rehabilitation, 2025, 10, 21(2025). https://doi.org/10.1007/s41024-024-00531-2
Sharma B, Zaheer S, and Hussain Z, “An experimental model for studying the performance of vertical and batter micro-piles”, Geo-Congress, Geo-Institute, ASCE, Reston, VA, 2014, 4252-4264.
Tsukada Y, Miura K, Tsubokawa Y, Otani Y, You GL, “Mechanism of bearing capacity of spread footings reinforced with micropiles”, Soils and Foundations, 2006, 46 (3), 367-376. https://doi.org/10.3208/sandf.46.367
Wu C, Xia H, Qin D, Luo J, “Tunnel entrance crossing spoil heap deformations control by micropile combine with coupling beams”, Geohazard Mechanics, Available online 12 December 2023. https://doi.org/10.1016/j.ghm.2023.12.002
نشریه مهندسی عمران و محیط زیست
دوره 56، شماره 123 - شماره پیاپی 123
تابستان 1405
شهریور 1405
صفحه 89-100

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