ارزیابی امکان احیاء مخزن سد آرباتان هریس با اجرای پتوی رسی

نویسندگان

1 دانشجوی کارشناسی ارشد ژئوتکنیک، گروه عمران، واحد آذرشهر، دانشگاه آزاد اسلامی، آذرشهر ، ایران

2 استادیار و عضو هیات علمی دانشگاه، گروه عمران، واحد آذرشهر، دانشگاه آزاد اسلامی، آذرشهر ، ایران

چکیده

نشت آب از بدنه و مخزن سد، یکی از مشکلات جدی در احداث آنها می باشد که علاوه بر خسارت های مالی، می­تواند تبعات منفی زیست محیطی و اجتماعی زیادی نیز به همراه داشته باشد. سد آرباتان شهرستان هریس، یکی از سدهایی است که در حوضه آبریز دریاچه ارومیه واقع شده است و به دلیل عدم انجام مطالعات دقیق ، دچار پدیده نشست شده و نهایتاً غیرقابل استفاده گردیده است. بررسی محل احداث سد نشان می­دهد که مخزن آن بر روی رسوبات تبخیری قرار گرفته و نفوذ آب باعث ایجاد تعدادی فروچاله و کانال­های فرار آب در لایه­های زیرین شده و در نهایت موجب تخلیه آب سد گردیده است. هدف از این مقاله، امکان سنجی فنی و اقتصادی احیای دوباره این سد با استفاده از پتوی رسی برای پوشش کف مخزن آن می­باشد. برای این منظور، پس از شناخت خصوصیات زیرسطحی مخزن، مدلسازی عددی با استفاده از نرم افزارSEEP/W انجام می­شود. همچنین با استفاده از روش بنت، میزان تراوش آب، در حالتی که سد دارای پتوی رسی می­باشد، تعیین می­گردد. بررسی نتایج حاصل از دو روش عددی و بنت نشان می­دهد که مقدار تراوش آب از مخزن سد پوشیده با پتوی رسی، به ترتیب برابر 23569 و 584000 مترمکعب در مدت 180 روز خواهد بود. بنابراین با وجود مقدار زیاد تراوش، کارآیی این روش برای احیای این سد مفید و راهگشا نخواهد بود. بطور کلی این حجم نشت ممکن است منجر به گسیختگی دوباره بدنه سد و پتوی رسی گردد.

کلیدواژه‌ها

عنوان مقاله [English]

Feasibility Study of Arbatan Dam Reservoir Restoration by Clay Blanket

نویسندگان [English]

  • M. M Moosavi 1
  • M. R Malekpoor 2
1 M.Sc. Student, Department of Civil Engineering, Azarshahr Branch, Islamic Azad University, Azarshahr, Iran
2 Assist. Prof., Department of Civil Engineering, Azarshahr Branch, Islamic Azad University, Azarshahr, Iran
چکیده [English]

Water leakage from dam reservoir and body is one of the most concerning issues in establishment of such large projects, which in addition to wasting costs brings lots of negative social and environmental consequences. One of the dams of Urmia lake catchment area, which suffers leakage phenomenon being unusable, consequently, due to not doing exact geotechnical studies is Arbatan reservoir of Heris town. Investigation of the dam establishment site shows that the dam reservoir has been placed on evaporative sediments and water penetration has resulted in formation of some sinkholes and water escape channels in the lower substrates and the dam discharge. So the aim of the present research study is to evaluate use of clay blanket for covering the reservoir floor and its restoration. To do so, after identifying subterranean features of the reservoir using SEEP/W numerical model and bent method, leakage amount of water was determined under clay blanket application state. Results of the two numerical and bent methods indicated that leakage amount of the dam reservoir covered with clay blanket are 23569 and 584000 cubic meter, respectively, within 180 days. So, with huge amount of leakage, efficiency of the method will not be effective and a good solution for the dam restoration. In general, such amount of leakage might result in repeated rapture in the dam body and clay blanket. So under such conditions, success of every investment related to this dam will confront high level of uncertainty.

کلیدواژه‌ها [English]

  • numerical model
  • Bent method
  • leakage
  • sinkhole
  • Econimic

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دانش آب و خاک
دوره 28، شماره 3
مهر 1397
صفحه 27-40

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