بررسی و امکان سنجی مدلسازی خطوط لوله مدفون در خاک های ماسه ای تحت تاثیر انتشار امواج لرزه ای با استفاده از تحریک جابجایی زمین

رضایی, میلاد; شریفی پور, محمد; اشرفی, محمد

doi:10.22065/jsce.2025.538715.3787

بررسی و امکان سنجی مدلسازی خطوط لوله مدفون در خاک های ماسه ای تحت تاثیر انتشار امواج لرزه ای با استفاده از تحریک جابجایی زمین

نوع مقاله : علمی - پژوهشی

نویسندگان

میلاد رضایی ¹

محمد شریفی پور ²

محمد اشرفی ³

¹ دانشجوی دکتری ژئوتکنیک، دانشکده فنی مهندسی، دانشگاه رازی، کرمانشاه، ایران

² دانشیار، دانشکده مهندسی عمران، دانشگاه رازی، کرمانشاه، ایران

³ محقق، دانشکده مهندسی عمران ، دانشگاه رازی، کرمانشاه، ایران

10.22065/jsce.2025.538715.3787

چکیده

حفظ ایمنی و پایداری خطوط لوله مدفون به عنوان شریان‌های حیاتی در برابر خطرات ناشی از جابجایی مستقیم گسل و انتشار امواج لرزه‌ای، از الزامات اساسی در طراحی و بهره‌برداری شبکه‌های زیرزمینی است. تحلیل دینامیکی رفتار این سامانه‌ها همواره با چالش‌هایی نظیر انتخاب تحریک ورودی مناسب، روش مدلسازی و نحوه حل عددی مواجه بوده است. علیرغم فراوانی داده‌های شتاب‌نگاری، ویژگی‌هایی همچون جرم ناچیز لوله، نامشخص بودن جرم مؤثر در پاسخ دینامیکی و هندسه پیچیده شبکه‌های مدفون، استفاده عملی از این داده‌ها را محدود کرده است. از این‌رو، ایجاد رابطه‌ای منطقی میان میزان تحریک جابجایی ورودی در نقاط مختلف لوله و خسارات محتمل، می‌تواند کلید اصلی تحلیل واقع‌بینانه رفتار خطوط لوله در برابر امواج لرزه‌ای باشد. در این پژوهش با استفاده از مدلسازی دینامیکی سه‌بعدی در نرم‌افزار Abaqus و به‌کارگیری ترکیب المان‌های تیر و فنر بر بستر الاستیک همراه با اعمال تحریک پایه از نوع جابجایی، مشکلات روش‌های مرسوم برطرف شده است. این رویکرد امکان تحلیل انتشار امواج لرزه‌ای در مقیاس بزرگ و منطقه‌ای را به‌صورت عملیاتی فراهم می‌کند. به منظور ارزیابی دقت مدل، یک خط لوله فولادی با قطر 8 اینچ و ضخامت 15.5 میلی‌متر از جنس فولاد API X52 در خاک ماسه‌ای متراکم مدل‌سازی و تحت تحریک جابجایی تا 600 میلی‌متر قرار گرفت. مقایسه نتایج مدل سه‌بعدی غیرخطی و مدل تیر بر بستر فنری معادل با داده‌های آزمایشگاهی نشان داد که میزان انحراف کمتر از 5 درصد بوده و تطابق مناسبی با مشاهدات آزمایشگاهی بزرگ‌مقیاس دارد. این نتیجه علاوه بر اعتبار مدل، بیانگر قابلیت استفاده از آن در تعیین حدود عملکردی بر اساس تحریک ورودی است. در این روش، تحریک جابجایی پایه موجب درک بهتر از نوع و میزان تخریب محتمل در لوله و اتصالات شده و می‌تواند در طراحی لرزه‌ای، مقاوم‌سازی و پایش سلامت خطوط لوله مدفون به‌صورت مؤثر به کار گرفته شود.

کلیدواژه‌ها

انتشار امواج لرزه ای

اندرکنش خاک لوله مدفون

تحلیل دینامیکی

تحریک جابجایی

تحلیل المان محدود

موضوعات

اندرکنش خاک و سازه

عنوان مقاله English

FEASIBILITY STUDY OF MODELING BURIED PIPELINES IN SANDY SOILS UNDER SEISMIC WAVE PROPAGATION USING GROUND DISPLACEMENT EXCITATION

نویسندگان English

Milad Rezaei ¹

Mohammad Sharifipour ²

Mohammad Ashrafy ³

¹ PhD Candidate, Department of Civil Engineering, Razi University, Kermanshah, Iran

² Associate Professor, Department of Civil Engineering,, Razi University, Kermanshah, Iran

³ Researcher, Department of Civil Engineering, Razi University, Kermanshah, Iran

چکیده English

The safety and stability of buried pipelines, as vital lifeline systems, must be ensured against hazards arising from fault displacements and seismic wave propagation through surrounding soils. Dynamic analyses of such systems are often challenged by the selection of appropriate input excitation, modeling strategy, and numerical solution methods. Despite the widespread availability of recorded accelerograms, their direct application is limited due to the negligible mass of pipelines, the uncertainty of participating mass in dynamic response, and the complex geometry of buried networks. Hence, developing a rational correlation between input displacement excitation and the resulting damage potential can be the key to a realistic seismic performance assessment of buried pipelines. In this study, a three-dimensional dynamic modeling framework was developed using Abaqus, incorporating a beam–spring system on an elastic foundation subjected to displacement-based base excitation. This approach effectively overcomes the limitations of conventional methods and enables practical large-scale and regional seismic wave propagation analyses. To validate the model, a steel pipeline with a diameter of 8 inches and wall thickness of 15.5 mm, made of API X52 steel and embedded in dense sand, was analyzed under base displacements up to 600 mm. Comparison of the 3D nonlinear model and the equivalent beam-on-elastic-foundation model with large-scale experimental data revealed deviations below 5%, demonstrating strong agreement and confirming the model’s reliability. The proposed displacement-based excitation framework not only facilitates the definition of performance thresholds but also enhances understanding of the type and extent of potential damage in pipes and joints. This approach provides an effective and practical tool for seismic design, retrofit, and health monitoring of buried pipeline systems.

کلیدواژه‌ها English

Seismic Wave Propagation

Soil&‌‌ndash

Pipeline Interaction

Dynamic Analysis

Displacement Excitation

Finite Element Analysis

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