ارزیابی کارآیی پرده تزریق در کنترل نشت از ساختگاه سنگی به کمک آنالیز سه‌ بعدی (مطالعه موردی: سد بتن غلتکی هایقر)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده فنی و مهندسی، دانشگاه یاسوج، یاسوج، ایران

2 دانشکده کشاورزی، دانشگاه یاسوج، یاسوج، ایران

3 سد هایقر، فیروزآباد، فارس، ایران

چکیده

مسئله نشت آب از پی و تکیه‌گاه‌ها از چالش‌های اساسی در ارتباط با طراحی و احداث سدها می‌باشد. از جمله مهم‌ترین پارامتر در طراحی سد در بررسی مسئله نشت، تعیین نفوذپذیری ساختگاه سد به ویژه در ساختگاه‌های سنگی می‌باشد. در این پژوهش ابتدا نفوذپذیری ساختگاه سد بتن غلتکی هایقر، واقع در استان فارس، که در دهانه دره ژرف و پر پیچ و خم هایقر قرار دارد، از طریق آزمایش‌های وسیع لوژان قبل و پس از اجرای پرده تزریق تعیین شد. سپس با استفاده از نرم‌افزار اجزا محدود سه بعدی PLAXIS 3D، توپوگرافی ساختگاه به صورت سه ‌بعدی مدل‌سازی گردید و آنالیز سه بعدی نشت سد انجام گرفت. میزان کارایی پرده ترزیق اجرا شده به کمک تحلیل‌های عددی مورد بررسی قرار گرفت. نتایج نشان داد که مقادیر دبی نشت کل در ساختگاه سد هایقر بدون پرده تزریق 0/01075 متر مکعب بر ثانیه بوده که پس از احداث پرده تزریق به 3-10×2/305 متر مکعب بر ثانیه رسیده است که نشانگر کاهش حدود 80 درصدی دبی نشت در اثر احداث پرده تزریق می‌باشد. نتایج مطالعه پارامتری نشان داد که با افزایش عمق پرده آب‌بند دبی نشت کاهش می‌یابد و با افزایش ارتفاع آب مخرن، میزان دبی نشت از کل ساختگاه به صورت خطی افزایش می‌یابد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of Grout Curtain Performance in Seepage Control from Rock Formations by 3D Analysis (A Case Study of Haigher RCC Dam)

نویسندگان [English]

  • Milad Rahimpour 1
  • Masoud Rabeti Moghadam 1
  • Mansour Parvizi 1
  • Mohammad Sedghi Asl 2
  • Jafar Fazeli 3
1 Geotechnical MSc Student, Department of Civil Engineering, Faculty of Engineering, Yasouj University, Yasouj, Iran
2 Associate Professor, Department of Soil Science, Faculty of Agriculture, Yasouj University, Yasouj, Iran
3 Geological Engineer, Ab Niroo Consulting Engineers, Haigher dam, Firoozabad, Fars, Iran
چکیده [English]

The issue of water seepage from foundations and abutments is one of the main challenges related to the design and construction of dams. One of the most important parameters in dam design in the study of seepage is to determine the permeability of the dam site, especially in rock formations. In this study, first, the permeability of Haigher roller compacted concrete dam site, located in Fars province, was determined through extensive Lugeon tests before and after the grout curtain. Then, using PLAXIS 3D FEM software, the site topography was modeled in three dimensions and three-dimensional dam seepage analysis was performed. The efficiency of the grout curtain was evaluated using numerical analysis. The results show that the total seepage discharge in the Haigher dam construction site without grout curtain is 1.075 * 10-2 m3/s and after the construction of the grout curtain is reduced to 2.305 × 10-3 m3/s, which indicates a reduction of about 80% seepage discharge. The results of the parametric study showed that with increasing the depth of the grout curtain, the seepage flow decreases and with increasing the reservoir water level, the seepage flow rate from the dam increases linearly.

کلیدواژه‌ها [English]

  • Haigher RCC dam
  • Seepage
  • Lugeon test
  • Grout curtain
  • PLAXIS 3D
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