مقایسه حد روانی حاصل از روش جام کاساگرانده و نفوذ مخروط برای خاک‌های مخلوط ماسه و رس

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

گروه مهندسی عمران، واحد سمنان، دانشگاه آزاد اسلامی

چکیده

حد روانی (Liquid Limit) یکی از ویژگی­ های مهم خاک است و تأثیر زیادی بر رفتار آن دارد. حد روانی به­ عنوان نقطه ­ای است که رفتار خاک رس از حالت خمیری به مایع تغییر می­ کند. مقاومت برشی این خاک در رطوبت نزدیک به حد روانی، بسیار کم است. بنابراین تعیین دقیق خواص خمیری خاک دارای اهمیت فراوانی است. در این پژوهش آزمایشگاهی، تأثیر ماسه بر حد روانی خاک مخلوط، رابطه بین حد روانی و درصد ماسه و رابطه بین حد روانی روش ­های نفوذ مخروط (Cone penetrometer) و جام کاساگرانده (Casagrande) با پایه سخت مورد ارزیابی قرار گرفته است. مقدار حد روانی برای رس بنتونیت دستگاه کاساگرانده برابر 78 و دستگاه نفوذ مخروط برابر 87 به دست آمد. با افزایش درصد ماسه، حد روانی کاهش یافت، رابطه حد روانی برحسب درصد ماسه، خطی بود و مقدار ضریب تعیین (Coefficient of determination) برای آزمایش ­های کاساگرانده و نفوذ مخروط به ­ترتیب برابر 997/0 و 999/0 به­ دست آمد. در رس بنتونیت، حد روانی حاصل از دستگاه نفوذ مخروط حدود 12 درصد بیشتر از حد روانی حاصل از دستگاه کاساگرانده بود. با کاهش حد روانی خاک مخلوط، اختلاف بین نتایج حاصل از دو دستگاه آزمایش افزایش یافت.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Comparison of Liquid Limit Obtained From Casagrande Cup Method and Cone Penetrometer for Sand and Clay Mixed Soils

نویسندگان [English]

  • Mahmoud Nikkhah Shahmirzadi
  • Ghasem Arabi
  • Minoo Zahra Hafezi
Department of Civil Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran
چکیده [English]

The behavior of the cohesive soil depends on many factors. Atterberg limits play an important role in the evaluation and classification of clays. In this paper, the relationship between the Liquid limit of the cone penetrometer methods and Casagrande cup of sand and clay mixed soils has been evaluated. The main purpose of this study is to compare the Liquid limit values obtained from the hard-base Casagrande device with the cone penetration method and to present the relationship between the Liquid limit values obtained from the two methods in terms of the percentage of sand in the mixed soil.

کلیدواژه‌ها [English]

  • Liquid limit
  • Sand
  • Bentonite
  • Casagrande
  • Cone penetration
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