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تأثير الاحمال الخطية على التربة.pptx
1.
ناشر نجيب مجد الحكيمي الحضرمي
حزام فؤاد محمد عبدهللا محمد صقر جعدار عمر عبدالقوي محمد العمارري إعداد : الحيدري ظافر سيف عمر عبدهللا حميد محمد الكرشمي يحيى رمزي يحيى الوادعي القاعدي حسن على أسامة إشراف تحت / الدكتور : حسين صدام الحدمه
2.
مقدمة : المتو االجهادات توزيع
لكيفية تفصيلي شرح البحث هذا يتناول داخل لدة التربة سطح على الخطية االحمال تأثير نتيجة التربة . بعض حل في كبيرة اهمية له التربة خالل االجهادات توزيع حساب تفي كما عليها كبيرة احمال وجود عن الناتجة التربة في المشكالت في د ح تنقل التي االساسات تصميم في وكذلك بها الحادث الهبوط حساب مل التربة هذه الى المبنى . الع هو التربة في االجهادات توزيع درسوا الذين العلماء أوائل من كان الم " بوسينيسك " " Bousssinesq " ع وتحليالته نظرياته في اعتمد والذي لى " المرونة نظرية ."
3.
فروض بوسينيسك ال في االجهادات
توزيع لتحليل تربة . • اعتبر بوسينيسك محدودة غير التربة ان . • التربة ( homogenous ) االتجاهات جميع في متشابهة لها الطبيعية الخواص ان اي . • لقوانين تخضع وأنها مرنة التربة ان " هوك " " Hooks low ." • التربة ( Isotropic ) االتجاها جميع في متشابهة لها والميكانيكية الطبيعية الخواص ان اي وان ت المعامالت G,E,µ بالتربة اتجاه اي في متشابهة منها كل يكون : ان اي EX = EY =EZ , GX = GY = GZ , µz = µx = µy , أن حيث : المرونة معامل E = االجهاد (𝜎) االنفعال (𝜀) يانج بمعامل يسمى ما وهو الصالبة معامل = القص اجهاد االجهاد هذا عن الناتج االنفعال بواس معامل ، ( µ = ) العرضي او االفقي االنفعال الراسي االنفعال
4.
درس بوسينيسك التربة داخل االجهادات
توزيع حساب في ونحن التربة سطح على المؤثر الحمل لنوع طبقا الراسية االجهادات توزيع عن نتحدث سوف العرض هذا الخطي الحمل نتيجة التربة في : المتصل المركبات ومرور الطريق بحمل الحمل هذا يتمثل الحمل هذا تأثير يمثل حيث الطولي االتجاه في ويكون عليه للطريق العرضي االتجاه في ( نظريا ) وضع حيث بوسينيسك قيمته وإيجاد الحمل توزيع لكيفية نظرية معادلة يلي كما التربة داخل : فرض بوسينيسك الموزع الخطي الحمل أن مقداره ( q ( ) بالطن / الطولي المتر ) ويكون االفقي على طوله ( y ) الراسي والعمق يكون التربة في مستوى الي ( z ) العمق على المتعامدة االفقية والمسافة ( z ) مقدارها يكون ( x () الثابت البعد في ) المجاور بالشكل موضح هو كما
5.
كالتي الخطي الحمل
عن والناتج التربة داخل نقطة أي عند االجهاد حساب يمكن : 𝜎𝑧 = 𝑞 𝑧 ∗ 𝑁𝐿 ( 𝑡 𝑚2) 𝜎𝑥 = 𝑞 𝑧 ∗ 𝐼𝐿 ∗ ( 𝑟 𝑧 )2 ( 𝑡 𝑚2) 𝜎𝑧 = الراسي االتجاه في االجهاد z و 𝜎𝑥 = االفقي االتجاه في االجهاد x q = الخطي الحمل مقدار z = ال بنهاية وكذلك عندها االجهاد حساب المراد بالنقطة مارا التربة في الراسي العمق حمل الخطي . 𝐼𝐿 = 2 𝜋 ( 1 1 + 𝑥 𝑧 )2 NL = معامل بوسينيسك بين تربط منحنيات وضع وتم الخطي n=y/z ، m=x/z حيث y المحور رأسية تقاطع بين ما ويكون الخطي الحمل طول z بالشكل يلي كما الحمل ونهاية :
6.
7.
𝑛1 = 𝑦1 𝑧 = 5𝑚 5𝑚 = 1 𝑚1
= 𝑥1 𝑧 = 0 5 = 0 𝑁𝐿1= 𝑛2 = 𝑦2 𝑧 = 5𝑚 5𝑚 = 1 𝑚2 = 𝑥2 𝑧 = 0 5 = 0 𝑁𝐿2= مثال / النقطة عند االجهاد حساب المطلوب A مقداره عمق على 5 m مقداره أفقي خطي حمل أسفل 5(t/m) وطوله = 10m النقطة وتقع A ؟ الطول منتصف في σz=qz*(NL1+NL2)
8.
قيمتي بدلالة الاجهاد
منحنيات خلال من n+m قيمتي نوجد معاملي بوسينيسك 𝑁𝐿 0.28 = 𝑁𝐿1 و 𝑁𝐿2 نعوض بالقيمتي الرئيسية المعادلة في اليجاد الخطي الحمل نتيجة الراسي االجهاد : 𝜎𝑧 = 𝑞 𝑧 ∗ 𝑁𝐿1 + 𝑁𝐿2 = 5 5 ∗ 0.28 + 0.28 = 0.56 𝑡 𝑚2
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14.
Thank for all
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