مطالعه آزمایشگاهی مدول یانگ خاکهای دانه ای با استفاده از آزمایش سه محوری سیکلیک با اندازه گیری موضعی کرنش

نوع مقاله : یادداشت پژوهشی

نویسنده

استادیار، گروه مهندسی عمران، واحد نجف‌آباد، دانشگاه آزاد اسلامی، نجف‌آباد، ایران

چکیده

در این تحقیق تأثیر خصوصیات دانه‌بندی از جمله درصد شن، تحکیم ناهمسان، روش ساخت نمونه، تنش همه‌جانبه و دانسیته نسبی بر روی مدول یانگ خاک دانه‌ای مورد ارزیابی قرار گرفته است. نتایج نشان می‌دهد که با اضافه شدن شن به ماسه میزبان در یک سطح تنش و دانسیته نسبی خاص، مقدار مدول یانگ خاک در سطوح کرنش‌های کوچک افزایش یافته است، ولی تأثیر آن در سطوح کرنش بزرگ تقریباً ناچیز است. از طرف دیگر با افزایش تنش همه‌جانبه، اثر مقدار شن اضافه شده بر روی تغییرات مدول یانگ کاسته می‌شود. نتایج نشان می‌دهد که مدول یانگ روند افزایشی با افزایش تنش همه‌جانبه و دانسیته نسبی دارد. همچنین نتایج آزمایش‌های ناهمسان نشان می‌دهد که در نمونه‌های تحکیم یافته تحت تحکیم ناهمسان با افزایش تنش انحرافی اولیه در زمان تحکیم نسبت به نمونه‌های تحکیم یافته در حالت همسان، مقدار مدول یانگ افزایش می‌یابد. از طرف دیگر در نمونه‌های تحکیم یافته در حالت تحکیم ناهمسان با کاهش تنش انحرافی اولیه نسبت به حالت همسان مقدار مدول یانگ کاهش می‌یابد. نتایج همچنین نشان می‌دهد که روش‌های متفاوت ساخت نمونه‌های دست‌خورده تأثیر مهمی بر روی تغییرات مدول یانگ دارد.

کلیدواژه‌ها

موضوعات

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  • تاریخ دریافت: 03 اردیبهشت 1398
  • تاریخ بازنگری: 17 مهر 1399
  • تاریخ پذیرش: 27 مهر 1399

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