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تاثیر پی چند لایه بر روی پارامترهای جریان نشت از زیر سدهای انحرافی | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 12، دوره 50، شماره 8، دی 1398، صفحه 1985-1999 اصل مقاله (1.08 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2019.278391.668153 | ||
| نویسندگان | ||
| محسن کریمی پوچ1؛ خلیل اژدری* 2؛ سید حسین حسینی3؛ روزبه مؤذن زاده3؛ حسن گلی3 | ||
| 1'گروه آب و خاک، انشکده کشاورزی، دانشگاه صنعتی شاهرود، شاهرود، ایران | ||
| 2گروه آب و خاک، دانشکده کشاورزی دانشگاه صنعتی شاهرود، شاهرود، ایران | ||
| 3گروه آب و خاک، دانشکده کشاورزی، دانشگاه صنعتی شاهرود، شاهرود، ایران | ||
| چکیده | ||
| در این تحقیق پارامترهای نشت در پی مطبق دو لایه و سه لایه یک سد انحرافی به صورت آزمایشگاهی بررسی شد. نتایج نشان داد که با افزایش هد بالادست مقدار دبی خروجی افزایش مییابد. روند افزایش برای دانهبندیd50= 0.6 mm وd50= 1.2 mm میلیمتر مشابه و محدوه تغییرات زیاد بوده اما برای دانهبندیd50= 0.2 mm میلیمتر محدوه تغییرات دبی کم است. برای پیهای دو لایه بهترین عملکرد در کنترل جوشش، آرایش d50= 0.2 mmو d50=1.2 mm و با هد بالادست 465 میلیمتر بود. همچنین آرایش d50= 0.6 mm و d50= 0.2 mm حداقل دبی نشت را بدون حضور پرده آببند در حدود 266/0میلیلیتر بر ثانیه داشت. در حضور پرده آببند نیز بهترین عملکرد در کنترل دبی نشت آرایشd50= 0.6 mm, d50=0.2 mm بود و دبی نشت در حدود 066/0 میلیلیتر بر ثانیه به دست آمد. در کنترل گرادیان هیدرولیکی، در حالت بدون پرده آببند و با پرده آببند بهترین عملکرد به ترتیب مربوط به آرایشd50= 1.2 mm, d50= 0.6 mm و d50= 0.6 mm, d50= 0.2 mm به ازای هد بالادست 410 میلیمتر در حدود 002/0 و 0011/0 بود. در آرایش سه لایه، آرایشهای d50= 0.2 mm, d50= 0.6 mm, d50=1.2 mm و d50=1.2 mm, d50= 0.6 mm, d50= 0.2 mm بهترین عملکرد را در کنترل پدیده جوشش داشتند بهطوریکه به ترتیب به ازای هد بالادست 490 میلیمتر و 480 میلیمتر اتفاق افتاد. بهترین آرایش به لحاظ کنترل دبی نشت بدون حضور پرده آببند و با پرده آببند آرایش d50= 0.2 mm, d50= 0.6 mm, d50=1.2 mm و d50= 0.2 mm, d50=1.2 mm, d50= 0.6 mm بود که مقدار دبی نشت به ترتیب در حدود 533/0 و 433/0 میلیلیتر بر ثانیه به دست آمد. بررسی نتایج پیها نشان داد که استفاده از پیهای چند لایه میتواند راهکاری موثر در کاهش گرادیان هیدرولیکی، کنترل پدیده جوشش و دبی نشت باشد. | ||
| کلیدواژه‌ها | ||
| پتانسیل هیدرولیکی؛ پرده آببند؛ پی دو لایه و سه لایه؛ دبی نشت؛ گرادیان هیدرولیکی | ||
| عنوان مقاله [English] | ||
| The Effect of Multi-layer Foundation on Seepage Flow Parameters under the Diversion Dams | ||
| نویسندگان [English] | ||
| Mohsen Karimi Pouch1؛ Khalil Azhdary2؛ seyyed Hossein Hosseini3؛ Roozbeh Moazenzadeh3؛ hassan Goli3 | ||
| 1ِDepartment of Soil and Water,Faculty of Agriculture, Shahrood University of Technology, Shahrood, Iran | ||
| 2Department of Soil and Water,Faculty of Agriculture, Shahrood University of Technology, Shahrood, Iran | ||
| 3Department of Soil and Water and, Faculty of Agriculture, Shahrood University of technology, Shahrood, Iran. | ||
| چکیده [English] | ||
| In this study seepage factors in two-layered and three-layered foundation of a diversion dam was investigated experimentally. Results showed by increasing the upstream head, outlet discharge increases. The trend of discharge increase was similar and the variations range was high for d50=0.6 mm and d50=1.25 mm, but the range of discharge variations was low for d50=0.24 mm. For two-layered foundations, the arrangement of D50=0.2 mm and D50=1.2 mm with 465mm upstream head was the best performance for piping control. Also the arrangement of D50=0.6 and D50=0.2 mm without cutoff had the least seepage discharge (about 0.266 mlit/s). In the presence of cutoff, the best performance for piping control was obtained for the arrangement of D50=0.6-0.2 mm and the seepage discharge was about 0.066 mlit/s. The arrangements of D50=1.2 mm, D50=0.6 mm without cutoff and D50=0.6 mm, D50=0.2 mm with cutoff had the best performance for hydraulic gradient control which were about 0.002 and 0.0011 for 410 mm upstream head, respectively. For three-layered foundation, the arrangements of D50=0.2 mm, D50=0.6 mm, D50= 1.2 mm and D50=1.2 mm, D50=0.6 mm, D50=0.2 mm showed the best performance for piping control so that piping was happened in 490 and 480mm upstream heads, respectively. The best arrangements in terms of seepage discharge control, without and with cutoff were respectively (D50=0.2 mm, D50=0.6 mm, D50= 1.2 mm) and (D50=0.2 mm, D50=1.2 mm, D50=0.6 mm) with 410mm upstream head, in which the seepage discharges were obtained about 0.533 and 0.433 mlit/s, respectively. The results of this study showed that the multi-layered foundations could be considered as an effective alternative in reduction of outlet gradient and control of piping and seepage discharge. | ||
| کلیدواژه‌ها [English] | ||
| Hydraulic potential, Cut off, Two-layered and three-layered foundation, Seepage discharge, Hydraulic gradient | ||
| مراجع | ||
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