مطالعه‌ آزمایشگاهی تأثیر ذرات نانو بر مشخصات دینامیکی خاک‌های ریزدانه سیمانته شده

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 دانشکده فنی و مهندسی، گروه مهندسی عمران، دانشگاه بناب

2 دانشکده مهندسی عمران، دانشگاه آزاد اسلامی واحد قزوین

10.22034/ceej.2026.67689.2441

چکیده

در پژوهش حاضر، رفتار سیکلی سیلت ماسه‌دار با رفتار سیکلی سیلت ماسه‌دار سیمانته محتوی سیمان و نانورس مقایسه شده است. خاک مورد استفاده در این پژوهش، ماسه 161 و لای غیرپلاستیک فیروزکوه با ترکیب 40 درصد ماسه و 60 درصد لای می‌باشد. در اینجا، اثرات فشار همه‌جانبه، کرنش برشی و جایگزینی نانورس به‌جای سیمان بر پارامترهای مدول برشی و میرایی ماسه لای‌دار فیروزکوه تثبیت شده با سیمان و نانورس مطالعه شده است. به این منظور، آزمایش‌های سه‌محوری سیکلی با سه سطح فشار محصورکننده مختلف 50، 100 و 150 کیلوپاسکال در محدوده کرنش برشی متوسط انجام شد. نتایج مهم حاصل نشان داد که مقادیر مدول برشی نمونه‌های ماسه سیمانته با نسبت آب به سیمان 1، بیشتر از مدول برشی نمونه‌های ماسه سیلتی در تمامی محدوده‌های کرنش‌ برشی مدنظر است. همچنین، مقدار مدول برشی با جایگزینی نانورس به‌جای سیمان در نمونه‌های سیمانی شده افزایش یافت و بالعکس با افزودن سیمان، میرایی نمونه‌ها کاهش یافت. با جایگزینی 20 درصد سیمان با نانورس مدول برشی به‌طور متوسط 3 مگاپاسکال نسبت به نمونه سیمانته افزایش و میرایی به‌طور متوسط 9/0 درصد نسبت به نمونه سیمانته کاهش یافت. با جایگزینی 40 درصد سیمان با نانورس نیز مدول برشی نسبت به نمونه سیمانته افزایش و میرایی کاهش یافت. برای بهبود پارامترهای دینامیکی خاک مورد آزمایش جایگزینی 20 درصد سیمان با نانورس کارایی بیشتری دارد. درحالت کلی، می‌توان جایگزینی نانورس به‌جای بخشی از سیمان را از منظر زیست‌محیطی مورد توجه قرار داد. از سوی دیگر، با افزایش فشار محصورکننده، مقادیر مدول برشی تمامی خاک‌های در نظر گرفته شده افزایش و میرایی آن‌ها کاهش یافت. به‌علاوه، تأثیر مثبت افزایش فشار همه‌جانبه و افزودن نانورس برروی روانگرایی خاک مورد آزمایش نیز قابل مشاهده بود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental Investigation of the Effect of Nano Materials on the Dynamic Properties of Cemented Fine-Grained Soils

نویسندگان [English]

  • Somayeh Mollaei 1
  • Gholam Reza Ostadi Asl 1
  • Mohammad Mollaei 2
  • Sayyad Taheri 1
  • Sanaan Nasri 1
1 Department of Civil Engineering, University of Bonab, Bonab, East Azerbaijan, Iran
2 Faculty of Civil Engineering, Islamic Azad University, Qazvin Branch, Qazvin, Iran
چکیده [English]

This study intends to investigate the specifications of the dynamic properties of sand with 60% non-plastic silt, improved by cement and different percentages of Montmorillonite nanoclay (nanoclay will replace some parts of the cement contents) using a cyclic triaxial strain control test subjected to confining pressure and different strain ranges. Shear modulus, damping ration and liquification of the normal (without treatment) and stabilized soil with cement and nano clay.

کلیدواژه‌ها [English]

  • Cyclic triaxial test
  • Silty sand
  • Shear modulus
  • Damping
  • Cement
  • Nanoclay

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