جاده

جاده

ارزیابی ظرفیت باربری خاک رس تقویت شده با ستونهای اختلاط عمیق دارای کلاهک ژئوتکستایل با آزمایشات بزرگ مقیاس و شبکه های عصبی مصنوعی

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشجوی دکترا، گروه مهندسی عمران، واحد نجف آباد، دانشگاه آزاد اسلامى، نجف آباد، ایران
2 دانشیار، گروه مهندسی عمران و معماری، دانشکده صنعت ساختمان و محیط زیست، واحد یاسوج، دانشگاه آزاد اسلامی، یاسوج، ایران
چکیده
ستونهای اختلاط عمیق(DSM) خاک یکی از روشهای بهبود مقاومت و ظرفیت باربری خاک برای توسعه مناطق شهری می باشد.هدف این تحقیق ارزیابی ظرفیت باربری خاک رس تقویت شده با ستونهای اختلاط عمیق و کلاهک ژئوتکستایل با آزمایشات بزرگ مقیاس و شبکه های عصبی مصنوعی بود. ابتدا مشخصات اولیه ئوتکنیکی بستر خاک توسط آزمونهای آزمایشگاهی اولیه از قبیل دانه بندی، درصد رطوبت طبیعی، حدود اتربرگ، pH، مقاومت فشاری تک محوری بدست آمد. سپس تعیین درصد مقدار رطوبت و مقدار افزودنی شیمیای بهینه های خاک تثبیت شده توسط آزمایشات تراکم استاندارد و مقاومت فشاری تک محوری جهت اعمال در ساخت ستونهای اختلاط عمیق خاک در حالات بدون و با کلاهک ژئوتکستایل انجام شد. در مرحله دوم آزمایش‌های آزمایشگاهی، نمودارهای بار - نشست برای هر سناریو با ساخت مناسب برای مدل آزمایشگاهی، پیکربندی‌های مختلف ستون‌های سیمانی و بدون شرایط و با کلاهک ئوتکستایل بر روی ستون‌های سیمانی ایجاد شد. مطالعات آزمایشگاهی نشان داد که وجود ستون های سیمانی می تواند ظرفیت باربری پی را تا 18 برابر در مقایسه با عدم وجود آنها افزایش دهد. حداکثر بار عمودی اعمال شده در تغییر شکل ثابت 30 میلیمتر بترتیب برابر با 37/18 و 59/24 کیلونیوتن در حالات بدون و با کلاهک ژئوتکستایل بود، که افزایش33درصدی در میزان بار اعمالی را نشان داد. شبکه مصنوعی مصنوعی برای هر چهار فرم مجزا سطح قابل قبولی از دقت را با مقدار همبستگی 94/0 را نشان داد.
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