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Numerical Analysis on Performance of strip footing on Clay Soil reinforced with Geogrid bags

دراسة عددية لأداء أساس مستمر فوق تربة غضارية باستخدام التربة المسلحة بحقائب الجيوغريد

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 Publication date 2018
and research's language is العربية
 Created by Shamra Editor




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This research study aims at investigating the potential benefits of using the reinforcement to improve the bearing capacity and reduce the settlement of strip footing on clay. To implement this objective, many numerical 2D-analyses by finite element method / Plaxis program were performed to study the behavior of reinforced soil foundation. And then we carry out a parametric study of the most effective parameter on bearing capacity. The results showed that the inclusion of reinforcement can significantly improve the bearing capacity and reduce the footing settlement. The strain developed along the reinforcement is directly related to the settlement. The results also showed that the inclusion of reinforcement can redistribute the applied load to a wider area, thus minimizing stress concentration and achieving a more uniform stress distribution. The redistribution of stresses below the reinforced zone can result in reducing the settlement of the underlying weak clayey soil.


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Research summary
يهدف هذا البحث إلى دراسة الفوائد المحتملة لاستخدام حقائب الجيوغريد كوسيلة لتحسين قدرة تحمل التربة وتقليل الهبوط تحت الأساسات المستمرة المنفذة على تربة غضارية. لتحقيق هذا الهدف، تم إجراء نمذجة عددية باستخدام طريقة العناصر المنتهية (FEM) وبرنامج Plaxis لدراسة سلوك التربة المسلحة تحت الأساس. أظهرت النتائج أن إضافة طبقة تسليح من الحقائب المصنعة تحسن بشكل واضح من قدرة تحمل التربة وتقلل من الهبوط الناتج تحت الأساس. كما أن وضع التسليح في التربة يؤدي إلى توزيع أفضل للإجهادات وتقليل تركيزها، مما يؤدي إلى تحسين الأداء العام للتربة المسلحة. تم إجراء دراسة بارامترية لأهم العوامل المؤثرة على قدرة تحمل التربة، مثل عمق أول حقيبة تسليح وعدد الحقائب وعمقها وصلابتها المحورية. أظهرت النتائج أن استخدام حقائب الجيوغريد يمكن أن يزيد من قدرة تحمل التربة بنسبة تصل إلى 140% عند استخدام أربع حقائب.
Questions related to the research
  1. ما هي الفائدة الرئيسية لاستخدام حقائب الجيوغريد في تحسين التربة؟

    الفائدة الرئيسية هي تحسين قدرة تحمل التربة وتقليل الهبوط تحت الأساسات المستمرة.

  2. ما هي الطريقة المستخدمة في النمذجة العددية في هذا البحث؟

    تم استخدام طريقة العناصر المنتهية (FEM) وبرنامج Plaxis في النمذجة العددية.

  3. ما هي العوامل التي تم دراستها في البحث لتحديد تأثيرها على قدرة تحمل التربة؟

    تم دراسة عوامل مثل عمق أول حقيبة تسليح، عدد الحقائب، عمق الحقائب، وصلابتها المحورية.

  4. ما هي النسبة المئوية لزيادة قدرة تحمل التربة عند استخدام أربع حقائب جيوغريد؟

    يمكن أن تصل نسبة زيادة قدرة تحمل التربة إلى 140% عند استخدام أربع حقائب جيوغريد.


References used
ANDRAWES, K. Z., MCGOWN, A., WILSON-FAHMY, R. F, & MASHHOUR, M.M., "The finite element method of analysis applied to soil-geotextile systems.", Proc. Second Int. Conf. on Geotextiles, Las Vegas, 2 :690-700, 1982
ANSARI Y, MERIFIELD R, YAMAMOTO H, SHENG D., "Numerical analysis of soilbags under compression and cyclic shear". Comput. Geotech. 38:659–68, 2011
BASUDHAR, P.K. AND DIXIT, P.M., "Finite element analysis of geotextile-reinforced sand-bed subjected to strip loading." Vol. 26, Pp. 91-99, 2008
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This research study aims at investigating the potential benefits of using the reinforcement to improve the bearing capacity and reduce the settlement of strip footing on clay. To implement this objective, many numerical 2D-analyses by finite elemen t method / Plaxis program were performed to study the behavior of reinforced soil foundation. And then we carry out a parametric study of the most effective parameter on bearing capacity. The results showed that the inclusion of reinforcement can significantly improve the soil’s bearing capacity and reduce the footing settlement. The strain developed along the reinforcement is directly related to the settlement. The results also showed that the inclusion of reinforcement can redistribute the applied load to a wider area, thus minimizing stress concentration and achieving a more uniform stress distribution. The redistribution of stresses below the reinforced zone can result in reducing the settlement of the underlying weak clayey soil.
In present investigation attempt has been made to study the bearing capacity and settlement characteristics of footings subjected to central vertical load and resting on layered soil with the help of model tests and with the application of finite e lement method (FEM) to calculate bearing capacity of a strip footing on one-layer and two-layer soil (Sand and Clay). To investigate the effect of various parameters on soil bearing Capacity a commercial finite element software, PLAXIS, has been used. Soil profile contains two soil types including sand and clay. Soil behavior is represented by the elasto-plastic Mohrcoulomb (MC) -model. For a one-layer case, the bearing capacity also is calculated which has a good agreement with theoretical equations. For a layered soil, soft-over strong soil, parametric study was carried out. It is concluded that the bearing capacity of footing decreases as the height of clayey soil increases whilst the displacement under footing increases. There is a critical depth where the stronger bottom layer does not affect ultimate bearing capacity and failure mechanism of footing.
Walls piles supported with Anchors are considered one of most ways of engineering supporting widespread. This research includes studying the behaviorof walls pile, through a numerical parametric study using the (plaxis / 2D) program. the study includ es the most influencing factors which include:(the angle of the inclination, the vertical spacing between the rows of Anchors andthe distance of the first row of anchors from the ground surface). The effect of these factors on the stability of the wall was studied.Where they give the best effect to the anchors and ensure the best possible positioning which contributes to reducing the economic cost of this constructions.
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