تأثير المسافة بين الأعمدة ومحتوى صمغ الزانثان الجاف على استجابة التحمل للطين الطري المُحسَّن بالأعمدة الرملية

محتوى المقالة الرئيسي

Malak Jamal Yahya
Mohammed Y. Fattah
Mohammed F. Aswad

الملخص

تتناول هذه الدراسة استجابة التحمل لأساس مربع ضحل مرتكز على طين طري مُحسَّن بوسادة رملية بسماكة 50 ملم ومجموعة من الأعمدة الرملية بترتيب 4 × 4 تحتوي على صمغ الزانثان الجاف. أُجريت اختبارات نموذجية مختبرية في صندوق فولاذي صلب بأبعاد 700 × 700 × 800 ملم وباستخدام أساس مربع بقياس 60 × 60 ملم. تم تحضير طبقة الطين عند محتوى ماء 25% بما يكافئ مقاومة قص غير مصرَّفة تقارب 17 كيلو باسكال. تم تركيب ستة عشر عموداً رملياً بقطر 25 ملم وطول 150 ملم أسفل الأساس بمسافتين مركزيتين مختلفتين هما 20 و 35 ملم. اختُبرت أربع نسب من صمغ الزانثان (0% و 0.5% و 1% و 2% من الوزن الجاف للرمل) لكل مسافة مع فترة معالجة ثلاثة أيام قبل التحميل الستاتيكي العمودي بمعدل 1 ملم/دقيقة. عُرِّف الفشل عند نسبة هبوط s/B = 11%. بلغ ضغط الفشل للطين غير المعالج 98.24 كيلو باسكال وارتفع إلى 110.76 كيلو باسكال للوسادة الرملية وحدها. عند المسافة 20 ملم كانت قيم ضغط الفشل 119.46 و 95.995 و 117.326 و 129.088 كيلو باسكال للنسب 0% و 0.5% و 1% و 2% على التوالي، بينما عند المسافة 35 ملم كانت القيم 99.92 و 126.77 و 174.15 و 124.35 كيلو باسكال. تحقق أعلى تحسن (174.15 كيلو باسكال، BCR = 1.773) عند مسافة 35 ملم مع 1% من صمغ الزانثان. أظهرت النتائج وجود تفاعل غير رتيب بين المسافة بين الأعمدة وجرعة البوليمر الحيوي، مما يدل على ضرورة تحسينهما معاً وليس بشكل منفصل.

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تفاصيل المقالة

القسم

Articles

كيفية الاقتباس

Yahya, M.J., Fattah, M.Y. و Aswad, M.F. (2026) "تأثير المسافة بين الأعمدة ومحتوى صمغ الزانثان الجاف على استجابة التحمل للطين الطري المُحسَّن بالأعمدة الرملية", مجلة الهندسة, 32(10), ص 24–51. doi:10.31026/j.eng.2026.10.02.

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