مقایسه رفتار برشی ماسه کربناته و کوارتزی براساس مفاهیم انرژی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه تهران، تهران، ایران

2 دانشگاه بی نالمللی امام خمینی )ره(، قزوین، ایران

چکیده

معمولا ماسه‌های کربناته یکی از خاک‌های مسئله دار بوده و به لحاظ مقاومتی متفاوت از ماسه‌های کوارتزی هستند. در این مقاله مقاومت برشی یک ماسه کربناته حاصل از سواحل شمالی دریای عمان به صورت مقایسه‌ای با یک ماسه کوارتزی با استفاده از آزمایش سه محوری تحکیم یافته-زهکشی شده بر مبنای مفاهیم انرژی مورد مقایسه قرار می‌گیرد. آزمایش‌ها تحت شرایط یکسان از نظر دانه بندی، دانسیته نسبی و تنش‌های همه جانبه و اشکال متفاوت دانه‌ها بر روی دو ماسه انجام گرفت. نتایج آزمایش‌ها و تحلیل‌ها نشان -داد که تفاوت‌های قابل توجهی به لحاظ مقدار مقاومت برشی و مولفه‌های آن، تغییرات حجمی خاک، قابلیت خرد شدگی دانه‌ها و اثر آن بر روی مقاومت برشی، انرژی صرف شده جهت خرد شدگی دانه‌ها و نسبت سهم اتساع و خردشدگی دانه‌ها از زاویه اصطکاک داخلی کل وجود دارد. در انتها ملاحظه گردید که در هر یک از ماسه‌ها یک ارتباط خطی بین نسبت انرژی صرف شده جهت شکستگی دانه‌ها از کل انرژی اعمالی به نمونه و سهم شکستگی دانه‌ها از زاویه اصطکاک داخلی کل وجود دارد. در ماسه‌ کربناته با قابلیت شکستگی بیشتر دانه‌ها حدودا 14 تا 31% و در ماسه کوارتزی حداکثر 10% انرژی اعمالی صرف شکستگی دانه‌ها می‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Comparative study of carbonate and quartz sand based on energy concepts

نویسندگان [English]

  • M. R. Rasouli 1
  • M. Hassanlourad 2
1 Faculty of Engineering, Imam Khomeini International University, Qazvin, Iran
2 Faculty of Civil Engineering, University of Tehran, Tehran, Iran
چکیده [English]

Abstract: carbonate sands have being known as problematic soils in civil engineering and their strength is different from those of quartz sands. In this paper Triaxial consolidated-drained shear strength of a carbonate sand obtained from north beach of Oman sea is compared with Firoozkooh quartz sand. Energy concept is used for the analysis. Tests were performed in the same conditions such as particle size distribution, relative density and confining pressure on sands with different particles shapes. Tests results and analysis showed considerable differences between two sands regarding the shear strength and its components, soil volume changes, particle breakage potential and its effects on the shear strength, consumed energy for the particle crushing, dilation and particle crushing portion from the total internal friction angle of soils. At the end, it was found that there is a linear relation between the consumed energy for particle crushing from total applied energy to the soil speciment and particle breakage portion from the soil total internal friction angle. In the carbonate sand with high particle breakage ability a value of %14 to %31 and in the quartz sand maximum %10 of applied energy is consumed for particle breakage.

کلیدواژه‌ها [English]

  • Carbonate Sand
  • Quartz sand
  • Triaxial Test
  • Energy Concept
  • Particle Breakage

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 49، شماره 1
خرداد 1396
صفحه 89-100

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