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بررسی علل تخریب بتن در پوشش کانالهای آبیاری (مطالعه موردی در دشت همدان- بهار) | ||
| تحقیقات مهندسی صنایع غذایی | ||
| مقاله 6، دوره 8، شماره 3، آذر 1386، صفحه 81-92 اصل مقاله (853.55 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| نویسنده | ||
| رضا بهراملو* | ||
| عضو هیئت علمی بخش تحقیقات فنی و مهندسی مرکز تحقیقات کشاورزی و منابع طبیعی همدان | ||
| چکیده | ||
| برای جلوگیری از تلفات آب در کانالهای آبیاری و ارتقای راندمان انتقال و توزیع آب، اغلب از پوششهای بتنی استفاده میشود ولی در اکثر موارد، بتن به کار رفته در این پوششها پایایی لازم را ندارند و پس از گذشت مدت زمان کوتاهی از اجرای طرح، دچار ترکخوردگی و تخریب میشود. برای بررسی این موضوع، مطالعة موردی روی پوشش بتنی کانالهای آبیاری دشت همدان- بهار انجام گردیده است. به همین منظور، پس از جمعآوری و بررسی اسناد و مدارک موجود و بازدید و از کانالهای تخریبشده در منطقه، و مشاهدات عینی نمونههایی تهیه شد. تعداد 9 نمونة مغزه از پوشش بتنی، 78 نمونة خاک بستر، و 12 نمونة آب جاری در کانالهای مذکور مورد آزمایشهای مختلف قرار گرفتند. بر اساس مجموعة نتایج حاصل از بازدیدها و آزمایشها، عوامل اصلی ترکخوردگی و تخریب پوشش بتنی کانالها در قالب دو گروه عوامل داخلی شامل کرموبودن بتن، نفوذپذیری بالا، و مقاومت فشاری پایین و عوامل خارجی شامل ذوب و یخبندان متواترو تغییرات دما، و همچنین مسائل طراحی و اجرا شناسایی شدند. | ||
| عنوان مقاله [English] | ||
| Study of Failure Factors in Concrete Lining of Irrigation Canals in Hamedan-Bahar Plain | ||
| چکیده [English] | ||
| Concrete is one of the most important construction materials widely using in hydraulic structures, such as lining of irrigation canals. Concrete durability might be decreased due to the environmental or inner factors with physical, chemical or mechanical reactions. Since, the climatologically condition is variable in most part of the country, local studies are needed to evaluate of the weakness and straight of the different concrete component for a given climate. Therefore even thought a large expense is used for lining of irrigation canals, most of these projects have low conveyance and distribution efficiency. This study was conducted for evaluation of failure factors in applied concrete lining in irrigation canals of Hamadan-Bahar plain. The main issue in irrigation canals of the mentioned plain has been destruction of lining, which appeared as cracks and destruction in concrete linings. The main purpose of this research was determination of effective factors for destruction of irrigation canals in four different locations namely, Gondehjin, Bahadorbeig, Abroomand and khooshabe Olia. The data collection were include samples of concrete linings, inflow water in canals and bed soil of lining. Totally, 9 samples of concrete, 12 of water and 78 of bed soil were collected. The samples were tested based on standard methods of ASTM and the results were compared with the primary documentations on design and performance of each irrigation canals as well as Iranian Concrete Code and ACI. According to results, the main causes of cracking and destructing of concrete lining of irrigation canals were: (i) the factors that related to concrete preparation (inner factors) such as improper vibration, wormy holes and low compressive strength, (ii) environmental factors such as temperature variation and freezing and thawing. | ||
| کلیدواژه‌ها [English] | ||
| Concrete, Cracking, Failure, Irrigation Canals | ||
| مراجع | ||
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