پژوهشنامه حمل و نقل

پژوهشنامه حمل و نقل

بررسی اثر افزایش ضخامت و ارتفاع هسته رسی سد خاکی بر رفتار دینامیکی سد (مطالعه موردی: سد مروک)

نوع مقاله : مقاله پژوهشی

نویسندگان
فاطمه ساکی 1
احمدرضا مظاهری 2
مسعود احمدی 3
1 دانش‌آموخته کارشناسی ارشد، دانشگاه آیت‌الله‌ العظمی بروجردی (ره)، بروجرد، ایران
2 دانشیار، گروه مهندسی عمران‌، دانشگاه آیت‌الله‌ العظمی بروجردی (ره)، بروجرد، ایران
3 استادیار، گروه مهندسی ژئومکانیک، دانشکده علوم زمین، دانشگاه صنعتی اراک، اراک، ایران
10.22034/tri.2024.459428.3244
چکیده
صنعت سدسازی به عنوان یکی از نخستین و پیچیده‌ترین قسمت از امور عمرانی به شمار می‌رود و از این رو همواره یکی از مباحث تحت نظر جوامع مختلف بوده است. سدهای مرتفع در مقابل تنش‌های برشی دارای ضعف‌هایی هستند. ‌طبق نتایج آنالیز دینامیکی این نتیجه حاصل می‌شود که شوک‌های لرزه‌ای ناشی از زلزله سبب گسترش بسیاری از ترک‌های بزرگ و کوچک در مناطق بالایی هسته می‌شود. با توجه به این که سدها معمولا در مناطق کوهستانی احداث می‌شوند، از این رو وجود گسل در فواصل دور و نزدیک محور سد اجتناب‌ناپذیر است. بررسی پتانسیل لرزه‌خیزی هر گسل در فاصله دور و یا نزدیک و تاثیر زمین‌لرزه ناشی از آن بر پایداری سد، یکی از معیارهای اصلی مکان‌یابی محور سد می‌باشد. بنابراین بررسی دقیق تاثیر زمین‌لرزه‌های میدان‌های دور و نزدیک بر پایداری سدها از اهمیت ویژه‌ای در طراحی سد و ارزیابی پایداری سدهای موجود، برخوردار می‌باشد. مدل‌سازی در این پژوهش با استفاده از نرم‌افزار المان‌محدود ژئواستودیو (2018) انجام شده‌است. جهت انجام تحلیل دینامیکی از رکورد زلزله‌های بروجرد، خرم‌آباد و سرپل‌ذهاب کرمانشاه استفاده شده است. مطابق نتایج حاصل از تحلیل شبه‌استاتیک سد مروک این نتیجه حاصل شد که، افزایش ضخامت هسته سبب کاهش ضریب‌اطمینان پایداری سد شده‌است؛ همچنین نتایج حاصل از تحلیل دینامیکی سد مورد مطالعه نشان داد که، ماکزیمم نشست رخ‌داده در سد در حالت بدون افزایش عرض هسته تحت اثر زلزله‌های بروجرد، خرم‌آباد و سرپل‌ذهاب به ترتیب 18/0 متر، 35/2 متر، 04/0 متر نتیجه شده است؛ این در حالی است که تحت اثر زلزله‌های مذکور با افزایش ضخامت هسته به میزان 14 متر، بیشینه نشست سد به ترتیب به میزان 20، 33/9 و 22/22 درصد افزایش یافته است.
کلیدواژه‌ها
سد مروک
تحلیل دینامیکی
تحلیل شبه‌دینامیکی
زلزله

موضوعات

عنوان مقاله English

Investigating the Effect of Increasing the Thickness and Height of the Clay Core of the Earthen Dam on the Dynamic Behavior of the Dam (Case Study: Marvak Dam)

نویسندگان English

Fatemeh Saki 1
Ahmadreza Mazaheri 2
Masoud Ahmadi 3
1 M.Sc., Grad., Department of Civil Engineering, Ayatollah Boroujerdi University, Boroujerd, Iran.
2 Assistant Professor, Department of Civil Engineering, Ayatollah Boroujerdi University, Boroujerd, Iran.
3 Assistant Professor, Department of Geomechanical Engineering, Faculty of Earth Sciences, Arak University of Technology, Arak, Iran.
چکیده English

Dam building industry is considered as one of the first and most complex part of civil affairs and therefore it has always been one of the topics under the scrutiny of different societies. High dams have weaknesses against shear stresses. According to the results of the dynamic analysis, it is concluded that the seismic shocks caused by the earthquake cause the expansion of many large and small cracks in the upper areas of the core. Due to the fact that dams are usually built in mountainous areas, the existence of faults near and far from the axis of the dam is inevitable. Investigating the seismic potential of each fault in the far or near distance and the effect of the resulting earthquake on the stability of the dam is one of the main criteria for locating the axis of the dam. Therefore, the detailed investigation of the impact of earthquakes in far and near fields on the stability of dams is of special importance in dam design and stability evaluation of existing dams. Modeling in this research has been done using Geostudio (2018) finite element software. In order to perform dynamic analysis, the records of earthquakes in Borujerd, Khorramabad and Sarpul Zahab of Kermanshah have been used. According to the results of the quasi-static analysis of the Meruk dam, it was concluded that the increase in the core thickness has caused a decrease in the stability assurance factor of the dam; Also, the results of the dynamic analysis of the studied dam showed that the maximum settlement that occurred in the dam without increasing the core width under the effect of Borujerd, Khorramabad and Sarpol Zahab earthquakes was 0.18 meters, 2.35 meters, and 0.04 meters, respectively.

کلیدواژه‌ها English

Marvak Dam
Dynamic Analysis
Quasi-Dynamic Analysis
Earthquake
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