تأثير طبقات الجيوكريد والسكيرت الاقتصادي على سلوك الأساسات المربعة فوق رمل جاف ضعيف تحت تأثير حمل عمودي مركزي
محتوى المقالة الرئيسي
الملخص
يوضح هذا البحث تأثير الحمل المركزي على ادأء أساس سطحي مربع بأبعاد 10×10 سم مستند على تربة رملية ذات كثافة نسبية مقدارها 30%. تمت المقارنة بين أساس غير مزود بسكيرت والأساس نفسة عند تدعيمه بسكيرت بطول B0.4 درست التربة تحت خمس حالات شملت تربة غير مسلحة, وتربة مسلحة بطبقة , وتربة مسلحة بطبقتين , وثلاث طبقات , وأربع طبقات من الجيو كرد ثلاثي المحاور. وضعت الطبقة الأولى من الجيوكريد على عمق B0.5 أبتداء من اسفل قاعدة الأساس بينما كان المسافة بين الطبقات الأخرى B0.25 أعتمد طول واحد للسكيرت لغرض تحقيق الجانب الاقتصادي حيث أظهرت النتائج أن الأساس المزود بسكيرت من دون تسلح للتربة حقق زيادة في قابلية التحمل وتقليل في الهبوط وعند تسليح التربة بطبقات الجيوكريد أظهرت أيضا النتائج إيجابية لكل من قابلية التحمل وتقليل الهبوط. كما أن إضافة طبقة رابعة من الجيوكريد لاتؤدي الى زيادة كبيرة مقارنة باستخدام طبقتين أو ثلاث. وقد لوحظ أعلى ارتفاع في نسبة قابلية التحمل (BCR) عند أستخدام ثلاث طبقات من الجيوكريد مع السكيرت, اذ بلغ نحو 3.50 مرة مقارنة بالأساس غير المحسن بالسكيرت وطبقات الجيو كريد.أما من ناحية الهبوط فقد بلغ معامل تقليل الهبوط (SRF) قيمة 0.790 في حالة الأساس المزود بسكيرت. وبذلك أثبتت النتائج أن استخدام الجيوكيد في التربة الضعيفة مع طول أقتصادي للسكيرت يؤدي الى تحسن ملحوظ في قابلية التحمل والهبوط
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