Do you want to publish a course? Click here

Analysis the Effect of Variation in Vertical Core Thickness on Stability of Earth Dams (Case Study: Dwesat dam)

تحليل تأثير سماكة النواة العمودية على استقرار السدود الترابية (حالة سد الدويسات)

1360   0   30   0 ( 0 )
 Publication date 2013
and research's language is العربية
 Created by Shamra Editor




Ask ChatGPT about the research

Therefore in this paper we will present the stability analysis carried out on the Dwesat dam with vertical core, its high is 33m, the downstream slope of 1V:2.75H and the upstream slope of 1V:3.0H. Thickness of the vertical core was varied from 1V:0.25H to 1V:2.0H, and also present the effect of the varied thickness on slope stability for both upstream and downstream under three design conditions i.e. during and end of construction, steady state seepage and rapid draw down by General Limit Equilibrium Method using GeoStudio software. It was observed from the analysis that by varying the thickness of vertical core of earth dam, thinner core up to 1V:1.30H gives more stability and further increase in thickness of core tends to sharp decline in factor of safety for both upstream and downstream slope under different design conditions.


Artificial intelligence review:
Research summary
تتناول هذه الدراسة تحليل تأثير سماكة النواة العمودية على استقرار السدود الترابية، مع التركيز على سد الدويسات كنموذج. تم استخدام طريقة التوازن الحدية العامة وبرنامج GeoStudio لتحليل استقرار السد في ثلاث حالات تصميمية: خلال فترة بناء السد، التسرب المستقر، والتقريخ السريع. أظهرت النتائج أن النواة ذات السماكة الأقل تعطي استقراراً أكبر، وأن زيادة السماكة تؤدي إلى انخفاض حاد في عامل الأمان للوجهين الأمامي والخلفي في الحالات الثلاثة المدروسة. تم تحليل البيانات باستخدام حزمتي البرامج seep/w وslope/w من Geo-Slope، وأظهرت النتائج أن السدود ذات النواة الأقل سماكة تعتبر أفضل من الناحية الاقتصادية، خاصة في المواقع التي تتوفر فيها كميات كبيرة من مواد البناء النفوذة وكميات ضئيلة من التربة الكتيمة.
Critical review
تعتبر الدراسة شاملة ومفصلة، حيث تناولت تحليل استقرار السدود الترابية من جوانب متعددة واستخدمت أدوات تحليل متقدمة. ومع ذلك، يمكن أن تكون هناك بعض النقاط التي تحتاج إلى توضيح أكثر، مثل تأثير العوامل البيئية الأخرى على استقرار السد، وكيفية التعامل مع التغيرات المناخية المحتملة. كما أن الدراسة قد تكون أكثر فائدة إذا تضمنت مقارنة مع دراسات أخرى مشابهة لتأكيد النتائج وتوسيع نطاق التطبيق.
Questions related to the research
  1. ما هي الحالات التصميمية الثلاث التي تم تحليلها في الدراسة؟

    الحالات التصميمية الثلاث هي خلال فترة بناء السد، التسرب المستقر، والتقريخ السريع.

  2. ما هي الطريقة المستخدمة لتحليل استقرار السدود في الدراسة؟

    تم استخدام طريقة التوازن الحدية العامة وبرنامج GeoStudio لتحليل استقرار السدود.

  3. ما هو تأثير زيادة سماكة النواة على استقرار السدود الترابية؟

    زيادة سماكة النواة تؤدي إلى انخفاض حاد في عامل الأمان للوجهين الأمامي والخلفي في الحالات الثلاثة المدروسة.

  4. لماذا تعتبر السدود ذات النواة الأقل سماكة أفضل من الناحية الاقتصادية؟

    تعتبر السدود ذات النواة الأقل سماكة أفضل من الناحية الاقتصادية لأنها تتطلب كميات أقل من التربة الكتيمة التي تكون عادة أكثر تكلفة من مواد البناء النفوذة.


References used
BISHOP A.W., BLIGHT G.E., -Some aspects of effective Stress in Saturated and unsaturated soils, Geotechnique, VOL. 13 , No 3, 1963
BISHOP A.W., MORGENSTREN N.R., - Stability coefficients for earth slopes, Geotechnique , VOL. 10 , No. 4. 1960
FREDLUND D. G., RAHARDIO H., - Soil Mechanics for un saturated soils, John wiley & sons , Newyork. 1993
rate research

Read More

This research includes analytical study by Finite Element Method about the effect of earthquakes in the stability of ALBASEL DAM, so we have set a numerical model suitable by using programs Slope/W, Quake/W. We run the model and we got the results of the simulation, which summarized in calculation factors of safety for verification the final stability of the dam under the effect of different intensity earthquakes. And then were compared between the two cases static and dynamic model showing the effect of the shear variables of the soil angle of internal friction and tendency of slops dam and the different situations of the lake water levels and the high of dam in addition to the effect of the construction material of the dam on the stability of the body of the dam. After the study each case depending on the parameters, that are entered, and based on the resulting factors of safety, the diagrams are painted to appear the positive or the negative effects to increase or decrease any variable of the dam variables in each of the static case and the dynamic case. And then we studied the effect of seismic Amplification resulting from the body of the dam on both the two horizontal and vertical component of seismic acceleration. The results will help us in a perfect choice for variables of Embankment dams for design.
The scientific and practical value of this research appears in recognizing the characteristics of the clay soil, which is located in Alnabeck, and used in constructing ALwagar earth fill dam. We will study five samples chosen from the materials site Hofar ALmlagea and which will be used in constructing ALwagar earth fill dam through which some Geo-geometrical characteristics like (Liquid Limit, Plasticity Limit, plasticity index, Consistency Index, Liquidity Index, Clay activity, collapse degree) will be determined. Depending on the Results of this study, we used international classifications (Casagrande classification – Unified Soil Classification System) to study the soil of the studied area. We made use of the results of the experimental study to determine the position of soil according to the international classification, and we suggested some solutions to improve the characteristics of the soil which is used in constructing soil dams.
The stability of the upstream shell of the dams is changed under the rapid drawdown condition where the pore water pressure has a different values according to the soil permeability. This paper considers the stability of the upstream shell of the " Braddon" dam with many types of soil and analyses each type under two rapid drawdown programs, the first program is when the discharge happens, according to the irrigation outlet by 25 m3/s, and the second program is when the discharge happens according to the tunnel conversion of the river by 500 m3/s. The obtained results show, that the stability of the upper slope under considered boundary conditions changed according to the soil type. Some soil have good stability factor while other soil collapsed .Accordingly, we can conclude that the type of soil of the upper dam slope is important and we could chose the appropriate type which does not cause dangerous during the rapid drawdown. Also the study shows that: the highest values of the safety factors result when the slopes are formed of high permeability soils as well as the slopes of homogeneous soil, while the soils formed of materials between them appeared decreasing values of safety factors.
This research study the cause failure earth dams After that it show the more important problems which dams exposure. During its construction and compassingthe importance causes of this case and how we can processing it , and show also the necessar y of earth dams observerand the necessary reportsto showing that the work of dam is good. The research also discusses the analysis of earth dam using the Geo slope program. We have chosen many parameters as total stresses, vertical strain , and pore water pressure to study change of this parameters with elevation in the upstream , downstream , and core of dam and draw the requisite graphsgraphs to compare this design values with reading of observer devices to be sure of typical work of dam. Finaly we showing the results and suggest many recommendations.
Asphalt concrete was used for the first time in Syria as a tightening material for dam Sourani. It was used in this dam as a surface facing on the front slope. Use of asphaltic concrete under climatic conditions prevailing in Syria, particularly h igh temperatures, is discussed in the paper. To achieve this goal, a number of bituminous concrete mixes, designed using the same constituent components in Sourani dam, were experimentally tested and analyzed. To determine the effect of the expected maximum temperatures for Sourani dam, a program depending on Energy balance was developed. Possible methods of reducing the effect of the high temperature in order to increase the stability of the asphalt surface facing are analyzed. In this context, the facing was plastered by a light-color, which led to a decrease in the temperature of the asphalt surface facing by about 20 degrees Celsius. The facing was also plastered by placing a concrete layer above it, which led to a decrease in the temperature of the asphalt surface facing by about 25 degrees Celsius.
comments
Fetching comments Fetching comments
Sign in to be able to follow your search criteria
mircosoft-partner

هل ترغب بارسال اشعارات عن اخر التحديثات في شمرا-اكاديميا