مطالعه آزمایشگاهی رفتار ژئوتکنیکی خاک‌های رمبنده بهسازی شده با مواد نانو

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، واحد استهبان، دانشگاه آزاد اسلامی، استهبان، ایران

2 گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه باهنر کرمان، کرمان، ایران

چکیده

رمبندگی را فروریزش ناگهانی خاک در اثر از دست رفتن عامل پیوند دهنده ذرات خاک تعریف کرده‌‌اند. فروریزش ماسه‌‌ها ناشی از لغزشی شدن ذرات رسی است که دانه‌‌ها را به چسبانده است، در حالی که رمبندگی خاک‌‌های رسی ناشی از بین رفتن پیوند الکتروشیمیائی  است .  نظر به اینکه پدیده رمبندگی مشکلات فراوانی را در اجرای پروژه های عمرانی کرده است،  بررسی رفتار این خاک و بهسازی آن بسیار با اهمیت است. در این مقاله تأثیر مواد نانو بر پتانسیل رمبندگی خاک بررسی شده است. بدین منظور، خاک با پتانسیل رمبندگی شدید از منطقه الله‌‌آباد کرمان انتخاب  و تأثیر افزودنی‌های نانوسیلیس، نانورس، نانواکسید آلومینیوم و نانوکربنات کلسیم با درصدهای مختلف بر رفتار  تغییر حجمی خاک،  پتانسیل رمبندگی و مقاومت برشی مطالعه گردیده است. نتایج نشان داد که به دلیل تغییر ساختار و اسکلت  خاک افزودن نانوسیلیس و نانورس  کاهش قابل ملاحظه پتانسیل رمبندگی را به همراه دارد و لی دو ماده دیگر یعنی نانوکربنات کلسیم و نانو اکسید آلمونیوم تأثیر کمتری دارند.  از طرفی نانوسیلیس و نانو رس باعث افزایش ضریب چسبندگی بیشتری می‌‌شوند در حالی که نانوکربنات کلسیم و نانوسیلیس بیشترین تأثیر بر زاویه اصطکاک داخلی خاک دارند. همچنین عکس‌‌برداری میکروسکوپ الکترونی روبشی (SEM) نشان داد که خاک رمبنده دارای حفرات میکروسکوپیک بوده و با افزودن نانومواد، خلل و فرج خاک کمتر و بافت خاک متراکم تر شده و در نتیجه کاهش پتانسیل  رمبندگی را به همراه دارد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental Investigation on Geotechnical Behavior of Collapsible Soils Improved with Nanomaterials

نویسندگان [English]

  • Aliakbar Soltaninejad 1
  • Mehdi Mokhberi 1
  • Seyed Morteza Marandi 2
1 departement of Civil Engineering, Roodhen Branch, Islamic Azad University, Roodhen , Iran
2 Dept of civil engineering, Faculty of engineering, Bahonar University , bahonar ,Iran
چکیده [English]

Collapsibility is the sudden change of the soil volume due to the loss of the bonding forces of soil particles. The collapsibility in sands is caused by the sliding of the saturated clay that sticks the sand particles, while the collapse phenomena of the clay are caused by the loss of the electrochemical bond that has formed on the outer surface of the clay plates. Considering that the phenomenon of subsidence has caused many problems in buildings and structures, it is very important to pay attention to the behavior of this type of soil and its improvement. In this research, the effect of nanomaterials on the collapsibility potential of soils has been investigated. The volume change behavior, the collapsibility potential, and the shear strength improved under the effect of Nano-silica, Nano-clay, Aluminum Nano-oxide and Calcium Nano-carbonate have been considered.  The results showed that the soil collapsibility index with the addition of Nano-silica and Nano-clay has a significant reduction in the collapse potential, but the Calcium Nano-carbonate and Aluminum Nano-oxide, have less effect on collapsibility reduction. Furthermore, the Nano-silica and Nano-clay increase the adhesion coefficient, while Nano-calcium Carbonate and Nano-silica have the greatest effect on the internal friction angle of the soil. Also, the scanning electron microscope (SEM) photography showed that the soil has microscopic pores and becomes less with the addition of nanomaterials. The soil pores and the soil texture become denser, and as a result, it reduces the collapse potential.

کلیدواژه‌ها [English]

  • Collapse potential
  • nano calcium carbonate
  • nano clay
  • nano silica
  • nano aluminum oxide

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نشریه مهندسی عمران امیرکبیر
دوره 55، شماره 10
دی 1402
صفحه 2091-2112

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