بررسی قوس زدگی در سدهای سنگریزه ای یک دهه پس از پایان ساخت با نتایج تحلیل عددی و مونیتورینگ بدنه سد (مطالعه موردی سد شهید مدنی تبریز)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه عمران، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران

2 گروه عمران، واحد شبستر، دانشگاه آزاد اسلامی، شبستر، ایران

چکیده

در تحقیق حاضر، رفتار مکانیکی سد سنگ‌ریزه‌ای شهید مدنی ده سال پس از تکمیل بدنۀ سد مورد ارزیابی قرار گرفته‌است. تحلیل عددی سه‌بعدی براساس روش اجزای محدود برای بدنه و تکیه‌گاه سد در نرم‌افزار میداس انجام شد. داده‌های ثبت‌شده توسط ابزارهای واقع در کل بدنۀ سد با نتایج تحلیل عددی در محل ابزار مقایسه گردید. نشست، فشار آب منفذی، تنش عمودی کلی و کنترل پایداری بدنۀ سد، پارامترهایی بودند که برای ارزیابی رفتار سد در ده سال پس از پایان ساخت سد، مورد استفاده قرار گرفتند. نتایج نشان داد که نشست‌ها، میزان فشار منفذی و تنش کلی به‌دست‌آمده از تحلیل عددی با داده‌های ثبت‌شده توسط ابزارها، منطبق بوده‌است. به‌طوری‌که در رفتار خطی بین داده‌های ابزار دقیق و تحلیل عددی در مورد نشست، فشار منفذی و تنش کل ضرایب همبستگی به‌ترتیب 67،84 و99 درصد به‌دست آمدند. پارامترهای فشار منفذی و تنش کل برای کنترل شکست هیدرولیکی هسته مورد استفاده قرار گرفته‌اند. نتایج ماکزییمم مقدار نشست حاصل از تحلیل‌های عددی و ابزار دقیق به‌ترتیب 1/79 و 1/90 متر، برای فشار منفذی450 و420 کیلوپاسکال، برای تنش کل 1440و1205 کیلوپاسکال به‌دست آمده‌است. با محاسبات صورت‌گرفته ماکزییمم نسبت ضریب قوس در سد شهید مدنی حاصل از قرائت ابزار دقیق و تحلیل عددی به‌ترتیب 0/77 و 0/91 بود که هر دو کمتر از عدد یک است، هم‌چنین حداکثر Ru حاصل از تحلیل عددی و ابزار دقیق نصب‌شده در هسته به‌ترتیب  0/35 و 0/47 می‌باشد که کمتر از مقدار پیش‌بینی‌شده در مرحلۀ طراحی 0/5 می‌باشند. بنابراین احتمال وقوع قوس‌زدگی هسته وجود ندارد، که نشان می‌دهد سد از نظر شکست هیدرولیکی در محدودۀ امن قرار دارد.

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of the arching in rock-fill dam ten years after end construction using Numerical analysis and monitoring

نویسندگان [English]

  • Rasoul Farajnia 1
  • Ramin Vafaei 1
  • Ahmad Zarean 2
  • Rouzbeh Dabiri 1
1 Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran
2 Department of Civil Engineering, Shabestar Branch, Islamic Azad University, Shabestar, Iran
چکیده [English]

In the present study, the mechanical behavior of Vanyar Rock fill dam has been evaluated ten years after the completion of the dam body.3D numerical analysis was performed based on the finite element method for the body and dam supports in Midas software. The data recorded by the tools in the dam body were compared with the results of numerical analysis at the tools site. The results showed that the amount of settlement, amount of pore pressure and the total stress obtained from the numerical analysis were consistent with the data recorded by the instruments. In linear behavior between instrumentation data and numerical analysis of settlement, pore pressure and total stress correlation coefficients were 84, 67 and 99%, respectively. .The maximum settlement values obtained from numerical analysis and instrumentation were 1.79 and 1.90 m, respectively, for pore pressure of 450 and 420 kPa, for total stress of 1440 and 1205 kPa. According to the calculations, the maximum ratio of Arching coefficient in Vanyar dam obtained from instrument readings and numerical analysis was 0.77 and 0.91, respectively, which are both less than one, as well as the maximum Ru from numerical analysis and instruments installed in the core Respectively 0.35 and 0.47. Which are less than the predicted value in the design stage of 0.5. Therefore there is no possibility of core curvature, which indicates that the dam is within safe range in terms of hydraulic failure.

کلیدواژه‌ها [English]

  • Rock fill Dam
  • Finite element
  • Pore pressure
  • Arching
  • Hydraulic fracturing

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