بررسی تغییر‌شکل وابسته به زمان در ماسه‌های خشک

نوع مقاله : پژوهشی

نویسندگان

• مسعود نصیری ¹
• محمد حاجی عزیزی ²
• احمد رضا مظاهری ³
• پنکاسم جانپرادیست ⁴

¹ مهندسی عمران – ژئوتکنیک، دانشکده فنی مهندسی، دانشگاه رازی، کرمانشاه، ایران

² مهندسی عمران، دانشکده فنی مهندسی، دانشگاه رازی، کرمانشاه، ایران

³ مهندسی عمران، دانشکده فنی مهندسی، دانشگاه آیت الله بروجردی، بروجرد، ایران

⁴ مهندسی عمران، دانشگاه صنعتی کینگ مونگ‌کوت، تونبوری، تایلند

10.22067/jfcei.2021.61760.0

چکیده

رفتار ماسه‌ها وابسته به زمان است و می‌تواند پایداری بسیاری از پروژه‌های ژئوتکنیکی را تحت تأثیر خود قرار دهد. در این پژوهش از 9 مدل ماسه با شکل و اندازه‌ی ذرات مختلف و دانه‌بندی متفاوت به‌منظور بررسی رفتار وابسته به زمان ماسه‌ها در بازه‌های زمانی 2، 7 و 30 روزه و تحت بارگذاری‌های مختلف استفاده شده‌است. نمونه‌ها با تراکم 60 درصد، به‌مدت 30 روز تحت تنش 45 کیلوپاسکال و در بازه‌های 7 روزه تحت تنش‌های 26 تا 416 کیلوپاسکال (با گام‌های افزایشی دو برابر) تحت آزمایش ادئومتر در حالت خشک قرار گرفتند. نتایج نشان داد که چرخش، لغزش و خُردشدگی دانه‌های ماسه روی هم در بازه‌های زمانی آزمایش‌شده تحت بارهای ثابت، عامل ایجاد تغییرشکل‌های خزشی در نمونه‌ها بوده‌است. نمونه‌های ماسه‌ای بین 5/1 تا 2/4 درصد کرنشِ خزشی در بازه‌ی زمانی 30 روزه و بین 61/0 تا 5/2 درصد کرنشِ خزشی در بازه‌های زمانی 7 روزه از خود نشان دادند. هم‌چنین روابط خطی به‌منظور پیش‌بینی تغییر‌شکل وابسته به زمان ماسه‌ها پیشنهاد شد. نتایج به‌دست‌آمده تطابق خوبی با مطالعات قبلی داشتند.

کلیدواژه‌ها

• ماسه‌ی خشک
• آزمایش ادئومتری
• رفتار وابسته به زمان
• اندازه‌ی ذرات

20.1001.1.27832805.1400.34.1.3.5

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عنوان مقاله [English]

Study of Time-Dependent Deformations in Dry Sands

نویسندگان [English]

• Masoud Nasiri ¹
• Mohammad Hajiazizi ²
• Ahmad Reza Mazaheri ³
• Pornkasem Jongpradist ⁴

¹ Department of Civil Engineering, Razi University, Taq-e Bostan, Kermanshah, Iran

² Department of Civil Engineering, Razi University, Taq-e Bostan, Kermanshah, Iran

³ Department of Civil Engineering, Ayatollah Borujerdi University, Borujerd, Iran

⁴ King Mongkut’s University of Technology Thonburi

چکیده [English]

The time-dependent behavior of sands is one of the main issues that can influence many projects. In this study nine sand models with different particles shape and sizes and different grain distribution have been used to investigate creep behavior. The samples were prepared at 60% relative density and the constant stresses of 45 kPa for 30 days and 26 to 416 kPa for seven days (with the double increase in stress increment) under dry conditions in the Oedometer apparatus (one-dimensional consolidation) were tested. The results showed that the rotation, slipping, and crushing of the sand grains over time under constant load was the cause of creep deformation in the dry samples. Sand samples exhibit 1.5 to 4.2% creep strains in 30 days, and 0.61 to 2.5% creep strains in seven days’ time interval. Finally, two linear equations are presented to predict the deformation of sands over time. The results were in good agreement with previous studies.

کلیدواژه‌ها [English]

• Dry Sand
• Creep
• Oedometer Test
• Time-Dependent Behavior
• Particle size

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