قابلية تحمل الركائز الحلزونية لحمل الشد: دراسة مراجعة
محتوى المقالة الرئيسي
الملخص
هناك طلب مستمر في الهندسة الجيوتقنية لإيجاد أساس يكون ذا تكلفة اقل و يوفر قدرة تحمل مقبولة أو حتى أكثر بكثير ضد احمال السحب, والانضغاط, والاحمال الجانبية, بالإضافة الى احمال عزم الدوران. وكل ذلك يكون بتأثير أقل على البيئة والمباني المحيطة. وقد تم استخدام الركائز الحلزونية على نطاق واسع في هذا الصدد. يمكن استخدام الركائز الحلزونية كأساس عميق أو ضحل في أنواع مختلفة من الترب عدا الترب التي تحتوي على الحصى أو الطين الصلب. الركيزة الحلزونية بصورة عامة تكون مصنوعة من عمود فولاذي عالي الجودة مع لوح حلزوني واحد أو ألواح حلزونية متعددة متصلة بالطرف السفلي من العمود بمسافات محددة من قبل المصمم. سلطت الدراسة الحالية الضوء على الطرق الميدانية والنظرية المختلفة التي تم استخدامها في حساب قابيلة تحمل الركائز الحلزونية لحمل السحب. تمت الاشارة إلى العديد من الدراسات الحقلية والمختبرية ودراسات المحاكاة العددية التي تبحث في أكثر المحددات تاثيرا على قابيلة تحمل هذه الركائز لحمل السحب أثناء تثبيت الركائز الحلزونية في التربة واثناءعملية تسليط قوى السحب. أظهرت الدراسات ان تثيبت الركائز بسرعة دوران مكافئة الى 1 دورة لكل ادخال ينتج ركائز ذات تحمل اعلى لقوى السحب بالإضافة الى زيادة العمق الدفن لاعلى لوح حلزوني , قطر الصفيحة الحلزونة, وعدد الصفائح الحلزونية الملحومة على عمود الركيزة الحلزونية . وبصورة عامة تقليل نسية (S/D) تعطي قابيلة تحمل اكثر لحمل السحب لاغلب الترب المستخدمة من قبل الباحثين ونفس الشئ يمكن ان يقال عند تقليل نسبة (L/D). وأخيرا زيادة الكثافة النسبية للتربة الرملية وزيادة قوة القص غير المصرفة في التربة الطينية يؤدي الى زيادة قابيلة تحمل الركائز الحلزونية لحمل السحب.
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كيفية الاقتباس
المراجع
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