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Register a new userNumerical Study of Excavation In Soil Clay Support by Piles with Anchors
دراسة عددية لتدعيم حفرية غضارية بصف من الأوتاد المدعمة بالشدادات
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Added by
Tishreen University ورقة بحثية
Publication date
2020
fields
Structural Engineering
and research's language is
العربية
Authors
توفيق فياض( باحث )
Created by
Shamra Editor
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تعتبر الجدران الوتدية المدعمة بالشدادت من أكثر طرق التدعيم الهندسية انتشاراً واستخداماً. سيتناول هذا البحث إجراء دراسة عددية لتدعيم حوض تأسيس الترب الغضارية الضعيفة مع وجود منسوب للمياه قريب من سطح الأرض. هذا البحث يتناول أيضاً دراسة سلوك الجدران الوتدية المدعمة بعدة صفوف شدادات، من خلال إجراء دراسة بارامترية عددية باستخدام برنامج (2D/Plaxis). هذه الدراسة تشمل أهم العوامل المؤثرة على استقرارهذا النوع من الجدران ومن ضمنها (زاوية ميل الشدادات، التباعد الشاقولي بين صفوف الشدادات،بعد أول صف للشدادات عن سطح الأرض). تم دراسة تأثير هذه العوامل على استقرار الجدار وإظهار مخططات الانتقالات خلف الجدار، وتبيان أفضل توضع للشدادات، بحيث تعطي أفضل فعالية للشدادات وأقل قيم للانتقالات الأفقية للجدار، وتؤمن أفضل توضع ممكن أن يساهم في تخفيف الكلفة الاقتصادية لهذا النوع من تدعيم المنشآت الهندسية.
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 includes 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.
Artificial intelligence review:
Research summary
تتناول هذه الدراسة العددية سلوك الجدران الوتدية المدعمة بالشدادات في الترب الغضارية باستخدام برنامج Plaxis/2D. تشمل الدراسة تحليل تأثير عدة عوامل على استقرار الجدران، مثل زاوية ميل الشدادات، التباعد الشاقولي بين صفوف الشدادات، وبعد أول صف شدادات عن سطح الأرض. تهدف الدراسة إلى تحديد أفضل وضعية للشدادات لتحقيق الاستقرار الأمثل للجدران وتقليل التكلفة الاقتصادية. تم استخدام النمذجة العددية بطريقة العناصر المنتهية لتحليل النتائج ومناقشتها، مع التركيز على تحقيق أفضل تصميم ممكن من الناحية الاقتصادية والعملية. أظهرت النتائج أن استخدام صف شدادات واحد بزاوية ميل 15 درجة وبعد 25% من ارتفاع حوض التأسيس عن سطح الأرض هو الأمثل لتحقيق الاستقرار وتقليل الانتقالات الأفقية للجدار.
Critical review
دراسة نقدية: تعتبر هذه الدراسة مهمة في مجال الهندسة المدنية، حيث تقدم حلاً عملياً وفعالاً لتدعيم الجدران الوتدية في الترب الغضارية. ومع ذلك، يمكن أن تكون هناك بعض النقاط التي تحتاج إلى مزيد من التوضيح. على سبيل المثال، لم يتم التطرق بشكل كافٍ إلى تأثير العوامل البيئية المختلفة مثل التغيرات المناخية أو الزلازل على استقرار الجدران. كما أن الدراسة اعتمدت بشكل كبير على النمذجة العددية دون إجراء تجارب ميدانية، مما قد يؤثر على دقة النتائج. من المستحسن إجراء تجارب ميدانية لدعم النتائج العددية وتقديم توصيات أكثر شمولية.
Questions related to the research
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ما هي العوامل الرئيسية التي تم دراستها في البحث لتحديد استقرار الجدران الوتدية المدعمة بالشدادات؟
العوامل الرئيسية التي تم دراستها تشمل زاوية ميل الشدادات، التباعد الشاقولي بين صفوف الشدادات، وبعد أول صف شدادات عن سطح الأرض.
-
ما هو البرنامج المستخدم في النمذجة العددية في هذه الدراسة؟
تم استخدام برنامج Plaxis/2D للنمذجة العددية بطريقة العناصر المنتهية.
-
ما هي الزاوية المثلى لميل الشدادات لتحقيق أفضل استقرار للجدران الوتدية؟
الزاوية المثلى لميل الشدادات هي 15 درجة.
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ما هي التوصيات المستقبلية التي قدمها الباحث لإجراء دراسات إضافية؟
يوصى بإجراء دراسات بارامترية باستخدام برامج عددية للنمذجة ثلاثية الأبعاد لتقديم تمثيل أدق ونتائج أكثر دقة، بالإضافة إلى التوسع في دراسة بارامترات أخرى مثل نوع التربة المحجوزة ومواصفاتها.
References used
Anno . F , E, " Application of Submerged Grouted Anchors in Sheet Pile Qua li t y Walls ", 2014, DICAM
Chavda. J, " Finite element modelling of extent of failure zone in c - θ soil at the cutting edge of open caisson ", 2015
rate research
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The problem of slope stability is considered as a main geotechnical problem due to the
significant damage (material or moral) related to failure. This paper aims to study the
influence of piles on the stability of slopes loaded with strip footing a
nd investigating the
parameters affected on stability (location of pile row relative to the slope crest X , piles
spacing S , piles length L and edge distance of the footing b ). This study has been realized
in two phases : the first phase consists in establishing a numerical model for sand slope by
using finite element analyses program (FLAC3D) and determining the footing settlement at
crest of slope before using piles and after reinforcing , after that the numerical results is
compared with the experimental ones (reference case ). A close agreement between
experimental and numerical curves is noticed .The second phase deals with studying the
influence of most important parameters such as ( piles length ,piles spacing, pile row
location relative to the slope crest on stability and edge distance of the footing) on the
slope stability. The results of parametric study have shown the piles installed near the slope
crest is more efficient in reinforcing where the safety factor is increased by reducing the
distance between row of piles and slope crest and the greatest value for safety factor when
X=0.7Lx . The currently study showed the efficiency of piles to increase the ultimate
bearing capacity with increasing edge, after that at b=3B the increase in ultimate bearing
capacity decreased. Also the slope stability depends significantly on pile length and it
increases even reaching the length equals the height of the slope. At other hand, the safety
factor is reduced by increasing the piles spacing, so that the efficiency of pile is
disappeared when pile spacing equals to six times pile diameter(UBCR<1.1).
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 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.
This research includes a numerical study using Finite Element Method aims to
evaluate the ability and accuracy of using Non-destructive Impact Response Method in the
assessment of length and cross-sections of intact concrete pile (not deformed) in
both time
and frequency domains. Therefore, an appropriate numerical model depends on the
modeling of both impact force (impulsive load) and distributing medium (pile + soil) and
insert them in computing software ABAQUS was carried out. The numerical model was
verified corresponding to field measures obtained from literature review and the results
showed good agreement between measures and numerical results. Furthermore, the model
was applied on a typical example in order to study vibration distribution in the pile due to
impulsive load applied on pile top. Mechanical response curve of intact pile was obtained.
Then, both of length and cross-section area of the pile were determined. Finally,
parametrical study of most important factors (stiffness of soil surrounding the pile and
length of pile embedded in the soil) effect on vibration distribution resulted from impulsive
load applied on pile top. The parametrical study was carried out in two domains; first one
was time domain depending on the direct analysis of particle displacement and velocity
and the second was frequency domain depending on analysis of pile mechanical response
curve. The results of this research enables to use the proposed numerical model to
numerically obtain the time history of particle displacement and velocity in addition to the
curve of mechanical response computed in the pile top and forms reference diagrams
which is used later to compare with similar diagrams resulted from field test of executed
piles. As a result, pile integrity test and detecting of defects in the piles if any. In addition,
the limits of the use of both analysis methods adapted in research and choose the best
between them according to the case study.
طريقة العناصر المنتهية
Finite element method
اختبار سلامة الأوتاد
تجارب الصدم غير المخربة
السجلات الزمنية للإهتزازات
تابع قابلية الحركة
منحني الإستجابة الميكانيكية للوتد
المجالين الزمني و الترددي
Pile Integrity Test
impulsive load
nondestructive impact tests
vibration time history
mobility function
pile mechanical response curve
time and frequency domains
ABAQUS
المزيد..
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.
This research represents a trial to establish a primary database of load tests applied on concrete driven piles embedded in sandy soils. This research depended on analyzing and evaluating a large number of available load test curves of driven piles.
The variation of pile ultimate bearing capacity value is studied according to several parameters such as (relative density of sand, embedded length of pile and pile diameter). Depending on the obtained results a primary approximate relationship is suggested to calculate the ultimate bearing capacity of driven piles in sand. Then, a comparison is made between the suggested method and the other analytical calculation methods and also, with the obtained results from an available international codes of practice in America, Russia and Germany. The approximate relationship introduces a simple and easy method to calculate the bearing capacity of concrete driven piles in sands. Also, This suggested method may be considered as an introduction to developing the
researches to include different kinds of soils.
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