بررسی آزمایشگاهی تأثیر کابل و آستانه بر عمق آبشستگی و الگوی جریان پیرامون پایه پل

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار مرکز تحقیقات علوم آب و محیط زیست، واحد شوشتر، دانشگاه آزاد اسلامی، شوشتر، ایران

2 عضو مرکز تحقیقات علوم آب و محیط زیست، واحد شوشتر، دانشگاه آزاد اسلامی، شوشتر، ایران

3 استادیار بخش عمران دانشگاه آزاد اسلامی واحد سپیدان سپیدان ایران

چکیده

آبشستگی موضعی اطراف پایه‌های پل یکی از علل تخریب آنها می‌باشد. از این رو جهت کاهش و کنترل این پدیده، تحقیقات گسترده‌ای صورت گرفته و راهکارهایی در این راستا ارائه گردیده است. این راهکارها شامل دو بخش مستقیم و غیرمستقیم بوده که در این تحقیق با تعریف سناریوهایی، بررسی هر دو روش و تأثیر توامان آنها انجام شد. در این مطالعه، روش استفاده از کابل که باعث تغییر در الگوی جریان اطراف پایه می‌گردد، بعنوان روش غیر‌مستقیم و آستانه که باعث انحراف خطوط جریان از روی بستر می‌شود،  به عنوان روش مستقیم در نظر گرفته شدند. از این رو حالت‌های مختلف از آستانه، در جلوی پایه، پشت پایه و کابل دور پایه با گام‌های نسبی برابر 33/0، 50/0 و 67/0 در شرایط آب زلال مورد بررسی قرار گرفت. در بهترین حالت، پایه دارای آستانه در جلو و گام کابل 33/0، دارای کمترین مقدار آبشستگی  می‌باشد. این پایه با میزان 63% بیشترین مقدار کاهش عمق آبشستگی در بین سایر سناریوها را داراست. در همین راستا پایه آستانه در پشت و گام کابل 33/0، دارای کاهش 45 درصدی می‌باشد که نشان می‌دهد در شرایط یکسان با جابجایی آستانه از پشت پایه به جلو پایه، 18 درصد عمق آبشستگی کاهش می­یابد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Laboratory Study of Cable and Sill Protection on Scouring Pattern Around the Bridge Pier

نویسندگان [English]

  • Mohsen Solimani Babarsad 1
  • Abbas Safaei 2
  • Roozbeh Aghamajidi 3
1 Water and Environmental Science Research Center, islamic azad university, shoushtar branch, shoushtar, iran
2 Water science and environment, shoushtar branch, islamic azad university, shoushtar, iran
3 Assistant proffessor civil department islamic azad university sepidan branch sepidan iran
چکیده [English]

Local scouring around the bridge pier is the leading causes of their destruction. Thus, to reduce and control this phenomenon, numerous researches have been done and many solutions have been suggested. These solutions are classified in two parts, direct and indirect protections methods. In this study, by definition different scenarios, both protection methods and their combined effects were investigated. In this research, cable around piers, as an indirect method, and sill as a direct method were used. Different locations of the sill (front and back of the pier) and the cable around the pier with relative pitch equal to 0.33, 0.50 and 0.67 in clean water conditions were investigated. In the best case, the pier with a front sill and a relative cable pitch of 0.33, has the least amount of scouring. This pier has the highest amount of scour depth reduction with 63% among the other scenarios. In this regard, the pier with a back sill and a relative cable pitch of 0.33, showed 45% reduction in scouring. This indicates that under the same conditions, with the sill movement from the back to the front of the pier, scouring depth parameter improved 18 percent.

کلیدواژه‌ها [English]

  • scour
  • Pier
  • Sill
  • cable
  • Clear Water
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