ارزیابی رفتار دینامیکی خاک ‏های ریزدانه با استفاده از الگوریتم دسته ‏بندی گروهی داده‏ ها

نویسندگان

1 استادیار، دانشکده فنی و مهندسی، دانشگاه شهرکرد

2 استادیار، دانشکده مهندسی عمران، دانشگاه سمنان

3 استادیار، مرکز تحقیقات ژئوتکنیک، پژوهشگاه بین المللی زلزله شناسی و مهندسی زلزله، تهران

چکیده

با توجه به اینکه عملکرد صحیح تأسیسات زیربنایی نیاز به طراحی دقیق دارد، بنابراین ارزیابی دقیق پارامترهای کلیدی با به ‏کارگیری روش­ های نوین از اهمیت ویژه­ ای برخوردار است. در سازه ­های خاکی و سیستم ­های حمل و نقل، به ­عنوان بخشی از مهم ترین ابنیه ­ی فنی و زیرساخت­ ها که خدماتی ضروری برای بشر فراهم می ­نمایند، همواره برآورد و پیش­بینی دقیق ­تر رفتار خاک، بخصوص در برابر بارهای دینامیکی، بسیار اهمیت دارد. خواص دینامیکی خاک­ ها شامل مدول برشی و نسبت میرایی از پارامترهای بسیار مهم جهت بررسی رفتار دینامیکی و همچنین مدل­ سازی این مصالح می ­باشند. ارزیابی صحیح این پارامترها برای انجام تحلیل ­های دقیق ­تر مسائل دینامیک خاک و یا اندرکنش خاک- سازه ضروری می­باشد. روش­ های آزمایشگاهی مختلفی جهت اندازه­ گیری خصوصیات دینامیکی خاک­ ها موجود بوده و مطالعات بسیاری انجام شده است. در این مطالعه، بر اساس نتایج موجود و با استفاده از الگوریتم دسته­بندی گروهی داده­ها (GMDH) دو مدل جهت ارزیابی مدول برشی و نسبت مبرایی خاک­های چسبنده ارائه گردیده است. بررسی صحت عملکرد مدل­ های ارائه شده، با استفاده از نتایج آزمون ­های سانتریفیوژ صورت گرفت. این مدل­ ها نسبت به پارامترهای ورودی آنالیز حساسیت شده و دقت آن ها مورد بررسی قرار گرفته است. در نهایت، مدل ­های ارائه شده با برخی روابط موجود مقایسه شده است. نتایج این تحقیق نشان از دقت بالای مدل­ های ارائه شده (مبتنی بر GMDH) در ارزیابی خصوصیات دینامیکی خاک ­های چسبنده دارد.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of Dynamic Behavior of Fine-Grained Soils Using Group Method of Data Handling

نویسندگان [English]

  • H. Javdanian 1
  • A. Haddad 2
  • Y. Jafarian 3
چکیده [English]

Since the proper performance of infrastructures requires a careful design, an accurate evaluation of key parameters by using new methods is of particular importance. In design process of soil structures and transportation systems, as a part of the most important technical buildings and substructures, which provide essential services for humans, it is very important to have a more accurate assessment and prediction of soil behavior, especially under dynamic load conditions. Dynamic properties of soils, including shear modulus and damping ratio, are crucial parameters to both fundamental understanding of dynamic behavior and modeling of these materials. Reliable and accurate dynamic properties of soils are necessary for the solution of many soil dynamic problems or soil-structure interaction. Up to now, the dynamic properties of soils have become the scope of many studies in the field of geotechnical earthquake engineering, using various laboratory methods. In this study, two models were developed for evaluation of shear modulus and damping ratio of cohesive soils using group method of data handling (GMDH). Validation of these models was carried out using centrifuge tests results. A parametric analysis was carried out to evaluate the sensitivity of the proposed models to variation of the influential parameters. Finally, the proposed models were compared to available relationships and charts. Results indicated that GMDH-based models could provide more accurate predictions of dynamic properties of cohesive soils, than those obtained by using previous studies.

کلیدواژه‌ها [English]

  • Soil structures
  • Fine-grained soils
  • Shear modulus
  • Soil damping
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