نشریه مهندسی عمران امیرکبیر

نشریه مهندسی عمران امیرکبیر

بررسی اثر هوازدگی و پوسیدگی بر روی خاک تثبیت شده با الیاف ساقه برنج

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشکده مهندسی عمران، دانشگاه صنعتی شاهرود، شاهرود، ایران
2 دانشکده مهندسی عمران و محیط زیست، دانشگاه صنعتی امیر کبیر، تهران، ایران.
چکیده
در این پژوهش، تأثیر سطوح مختلف پوسیدگی الیاف ساقه برنج (RSF) بر مقاومت فشاری خاک تثبیت‌شده با مقادیر مختلف سیمان مورد بررسی قرار گرفته است. این ارزیابی با استفاده از آزمایش مقاومت فشاری محصور نشده (UCS) و آزمایش‌های تراکم استاندارد (SCT) انجام شد. همچنین، تأثیر هوازدگی بر تغییرات وزنی نمونه‌های خاک حاوی درصدهای مختلف الیاف از طریق آزمایش‌های سیکل ذوب - یخ بررسی شد. متغیرهای این پژوهش شامل درصد الیاف (0%، 0/25%، 0/5% و 1%)، درصد سیمان (0%، 4%، 8% و 12%) و زمان عمل‌آوری (۰، ۷، ۱۴ و ۲۸ روز) می‌باشد. هدف از بررسی اثرات پوسیدگی و هوازدگی بر الیاف طبیعی، دستیابی به اهداف پایداری در مهندسی ژئوتکنیک است. نتایج نشان داد که با افزایش درصد الیاف از 0% به 1%، مقاومت فشاری نمونه‌های خشک و مرطوب کاهش و کرنش گسیختگی افزایش یافته است. در نمونه‌های پوسیده، مقاومت فشاری و کرنش گسیختگی به ترتیب 39/28 % و 80/69% کاهش یافت. لازم به ذکر است که نمونه‌های تثبیت‌شده حاوی 12% سیمان، مقاومت فشاری بیشتری نسبت به نمونه‌های حاوی 4% و 8% سیمان داشتند، هرچند کرنش گسیختگی در آن‌ها کمتر بود. در آزمایش‌های سیکل ذوب - یخ، با افزایش درصد الیاف، به ویژه در نمونه‌های عمل‌آوری‌شده، کاهش وزن افزایش یافت. مقادیر میانگین R2 حدودا ۰.۸۸ نیز کارایی مدل‌های روش سطح پاسخ (RSM) را نشان می‌دهد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Investigation of the Effects of Weathering and Decay on Soil Stabilized with Rice Straw Fibers

نویسندگان English

mohammad amin Ghasemi Alamshiri 1
mohsen keramati 1
Hossein Moradi Moghaddam 2
1 shahrood university of technology
2 Amirkabir university of technology
چکیده English

This study investigates the effect of varying levels of rice straw fiber (RSF) decomposition on the unconfined compressive strength (UCS) of soil stabilized with different cement contents. The evaluation was conducted using the unconfined compressive strength test (UCS) and standard compaction tests (SCT). Additionally, the effect of weathering on the weight changes of soil samples containing different percentages of fibers was examined through freeze-thaw cycle tests. The variables in this research include: Fiber content (0%, 0.25%, 0.5%, and 1%), cement content (0%, 4%, 8%, and 12%) and curing time (0, 7, 14, and 28 days). The objective of examining the effects of decomposition and weathering on natural fibers is to achieve sustainability goals in geotechnical engineering. The results indicated that as the fiber content increased from 0% to 1%, the compressive strength of both dry and wet samples decreased, while the strain at failure increased. In decomposed samples, the compressive strength and strain at failure decreased by 39.28% and 80.69%, respectively. It is noteworthy that stabilized samples containing 12% cement exhibited higher compressive strength than those with 4% and 8% cement, although their strain at failure was lower. In the freeze-thaw cycle tests, the weight loss increased with a higher percentage of fibers, especially in the cured samples. The average R2 values of approximately 0.88 also demonstrate the effectiveness of the Response Surface Methodology (RSM) models.

کلیدواژه‌ها English

Rice Straw Fibers
Weathering
Decay
Cement
RSM
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