مهندسی سازه و ساخت

مهندسی سازه و ساخت

تاثیر دوره‌های تر و خشک شدگی بر مقاومت فشاری خاک بهسازی شده با الیاف، سیمان و صمغ درختان

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشجوی دکتری، گروه مهندسی عمران، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران
2 دانشیار، گروه مهندسی عمران، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران
3 Najafabad University
4 استاد، گروه زمین‌شناسی، دانشگاه اصفهان، اصفهان، ایران
چکیده
مطالعات متعددی برای بررسی خواص مکانیکی خاک‌های بهسازی‌شده با استفاده از مواد مختلف، از جمله الیاف طبیعی و مصنوعی، چه به‌تنهایی و چه در ترکیب با تثبیت‌کننده‌های سنتی مانند سیمان و آهک، انجام شده است. بااین‌حال، تحقیقات محدودی در مقایسه عملکرد الیاف طبیعی و مصنوعی مختلف مانند کنف، شیشه، پنبه و الیاف ویرجین تحت شرایط مشابه وجود دارد. در این مطالعه، اثرات این الیاف در درصدهای مختلف سیمان و همچنین جایگزینی جزئی سیمان با صمغ درختان بر مقاومت فشاری محدودنشده (UCS) خاک بصورت آزمایشگاهی بررسی شد. آزمایش‌های UCS برای نمونه‌های حاوی سیمان و صمغ فارسی پس از 28 روز عمل‌آوری در شرایط حفظ رطوبت انجام گرفت. نتایج نشان داد که افزودن الیاف به خاک، منجر به بهبود قابل ملاحظه عملکرد مقاومت فشاری محدودنشده شد. استفاده از سیمان به‌عنوان تثبیت‌کننده، بیشترین بهبود را در مقاومت فشاری محدودنشده نشان داد و حداکثر بهبود 414 درصدی حاصل شد. بااین‌حال، جایگزینی جزئی سیمان با صمغ درختان منجر به کاهش مقاومت فشاری گردید که محدودیت‌های صمغ را به‌عنوان یک عامل تثبیت‌کننده منفرد یا مکمل تحت شرایط مطالعه‌شده نشان می‌دهد. مقدار بهینه صمغ 75/2 درصد شناسایی شد که منجر به بهبود مقاومت فشاری محدودنشده تا 69 درصد نسبت به خاک بدون اصلاح شد. نتایج آزمایش‌ها تحت دوره‌های تر و خشک‌شدگی (WDC) مقاومت بسیار پایین نمونه های بهسازی شده با الیاف و صمغ را نشان داد، بطوریکه نمونه‌ها در طول دوره‌های تر و خشک‌شدگی کاملاً از بین رفتند؛ این در حالی بود که نمونه‌های حاوی سیمان عملکرد بهتری از خود نشان دادند.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Effect of Wet-Dry Cycles on the Compressive Strength of Soil Improved with Fibers, Cement, and Tree Gum

نویسندگان English

S.A.H. Hoseini 1
Meysam Bayat 2
M. Mousivand 3
R. Ajalloeian 4
1 PhD student, Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
2 Associate professor, Department of Civil Engineering, Najafabad branch, Islamic Azad University, Najafabad, Iran
3 Assistant professor, Department of Civil Engineering, Gonbad Kavoos Branch, Islamic Azad University, Gonbad Kavoos, Iran
4 Professor, Department of Geology, University of Isfahan, Isfahan, Iran
چکیده English

Numerous studies have explored the mechanical properties of soils enhanced with various materials, including natural and synthetic fibers, either alone or combined with traditional stabilizers such as cement and lime. However, limited research has compared the performance of different natural and synthetic fibers—such as hemp, glass, cotton, and virgin fibers—under similar conditions. This study investigates the effects of these fibers at varying cement percentages, along with the partial replacement of cement by Persian gum, on the unconfined compressive strength (UCS) of soil. Experiments were conducted on samples containing cement and Persian gum after 28 days of curing under moisture-retention conditions. The results revealed that fiber inclusion significantly enhanced the UCS of the soil. Cement, as a stabilizer, yielded the highest UCS improvement, with a maximum increase of 414%. However, partially replacing cement with Persian gum led to a reduction in UCS, highlighting the limitations of Persian gum as a standalone or complementary stabilizing agent under the conditions tested. The optimal gum content was determined to be 2.75%, achieving an improvement of approximately 69% in UCS compared to untreated soil. Wet-dry cycle tests showed poor performance of fiber- and gum-reinforced specimens, with complete failure observed during the cycles. In contrast, cement-stabilized specimens exhibited better durability under these conditions.

کلیدواژه‌ها English

Soil improvement
Cement
Fiber
Persian Gum
Wet-Dry Cycles
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  • تاریخ دریافت 29 دی 1403
  • تاریخ بازنگری 24 خرداد 1404
  • تاریخ پذیرش 18 تیر 1404