مطالعه آزمایشگاهی تأثیر الیاف پلی‌پروپیلن بر پارامترهای مقاومتی خاک تثبیت شده با آهک و سیمان

نوع مقاله : مقاله پژوهشی (کاربردی)

نویسندگان

1 عضو هیات علمی، گروه مهندسی عمران، دانشگاه فنی و حرفه ای، تهران، ایران.

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

3 کارشناسی ارشد، گروه مهندسی عمران، دانشگاه فنی و حرفه‌ای، تهران، ایران.

چکیده

به‌منظور مطالعه تأثیر الیاف پلی‌پروپیلن بر رفتار مکانیکی و پارامترهای مقاومتی خاک رس تثبیت‌نشده و تثبیت‌شده با سیمان و آهک نمونه‌هایی در دوازده گروه مختلف با درصدهای مختلف الیاف پلی‌پروپیلن شامل0 درصد، 4/0 درصد، 0/1 درصد، 7/1 درصد و 5/2 درصد (درصدی از وزن خاک خشک)،0 درصد و ۴ درصد سیمان 0 درصد و ۳ درصد آهک ساخته شد. پس از عمل‌آوری نمونه‌ها به مدت ۱۴ و ۲۸ روز در گرمکن با دمای ۳۰ درجه سانتی‌گراد، آزمایش مقاومت فشاری تک‌محوری روی آنها صورت پذیرفت. نتایج آزمایش‌ها نشان داد که وجود الیاف مسلح‌کننده در طرح اختلاط خاک رس تثبیت‌شده و تثبیت‌نشده، سبب افزایش مقاومت فشاری تک‌محوری و نیز کرنش گسیختگی گردیده است و این تأثیر در نمونه‌های تثبیت‌شده نسبت به نمونه‌های تثبیت‌نشده بیشتر است. همچنین مقدار الیاف بهینه که سبب بیشترین مقاومت فشاری تک‌محوری نمونه‌ها شده معادل 4/0 درصد برآورد گردیده است. همچنین نتایج نشان داد وجود الیاف، سبب کاهش مدول الاستیسیته در نمونه‌ها، شکل‌پذیرتر شدن رفتار آنها و مقاومت بیشتر بعد از گسیختگی (تنش تحملی توسط مصالح در کرنش­های بیشتر از کرنش متناظر با گسیختگی آنها نسبت به نمونه­های فاقد الیاف یا دارای میزان الیاف کمتر، بیشتر می‌شود) گردیده است. اندرکنش بین سطوح الیاف با جسم خاک به‌وسیله عکس‌برداری الکترونی روبشی (SEM) بررسی شد. نتایج نشان داد اصطکاک و مقاومت ایجاد شده بین سطوح الیاف و خاک، عامل اصلی تغییر در راستای بهبود رفتار مکانیکی خاک است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental Study of the Effect of Polypropylene Fiber on Mechanical Properties of Lime and Cement Stabilized Soil

نویسندگان [English]

  • Mohammad Mostafa Jafari 1
  • MohammadHossein Bagheripour 2
  • Masoud Lakzadeh 3
1 Faculty Member ,Department of Civil Engineering, Technical and Vocational University (TVU), Tehran, Iran.
2 Professor, Department of Civil Engineering, Faculty of Technical and Engineering, Shahid Bahonar University, Kerman, Iran.
3 MSc, Department of Civil Engineering, Technical and Vocational University (TVU), Tehran, Iran.
چکیده [English]

12 groups of soil samples were prepared with various percentage of PP-fiber content (i.e. 0.0%, 0.4%, 1%, 1.7% and 2.5% by weight of soil), cement (i.e. 0% and 4% by weight of soil) as well as lime (0% and 3% by weight of soil) to study the effect of PP-fiber on mechanical behaviour and strength of non-stabilized and stabilized clayey soil with cement and lime. The unconfined compression tests were carried out on samples that were cured at 30°C and kept for 14 and 28 days in oven. The test results showed that inclusion of fiber reinforcement in stabilized and non-stabilized clayey soil mixtures caused an increase in the unconfined compressive strength (UCS) and failure strain. However, such effects were much more evident in stabilized samples when compared with those of non-stabilized samples. Furthermore, maximum unconfined compressive strength of samples was obtained at an optimum percentage of fiber content of 0.4%. The results indicated that the existence of fiber in specimens decreased the stiffness of samples, caused more ductile behaviour and loss of post-peak strength. The interactions at the interface between fiber and soil matrix were studied by using Scanning Electron Microscopy (SEM). The results demonstrated that the friction and bound strength between fiber surface and soil were significantly effective in changing the mechanical behaviour of soil.

کلیدواژه‌ها [English]

  • Soil mixing
  • Soil improvement
  • Fiber
  • Fiber reinforced soil
  • Unconfined compressive strength

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فصلنامه علمی کارافن
دوره 19، شماره 1 - شماره پیاپی 57
فنی و مهندسی
خرداد 1401
صفحه 59-81

فایل ها

سابقه مقاله

  • تاریخ دریافت: 25 فروردین 1400
  • تاریخ بازنگری: 09 تیر 1400
  • تاریخ پذیرش: 15 شهریور 1400

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