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Article
Stability Analysis of an Earth Dam Using GEO-SLOPE Model under Different Soil Conditions

Authors: Usama R. Mishal --- Thair Sh. Khayyun
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 5 Part (A) Engineering Pages: 523-532
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Numerical models are used to check the stability of earth dams and to simulate the effects of all the parameters, which affect its safety. The physical properties of the materials used in the construction of an earth dam are one of these important parameters. The finite element analysis software used for numerical modeling in this study is GeoStudio 2007(SEEP/W and SLOPE/W). The total number of finite elements used to simulate the standard model is 13508 (triangular elements with global size = 2m), while the total number of nodes is 6939. The selected case study is Al-Adhaim dam, which is an earth dam, located in Diyala governorate at the eastern part of Iraq, crossing Al-Adhaim River with a total length of (3.1 km). The major objective of this study is to derive an empirical equation to calculate the factor of safety for earth dams of similar geometries and materials without the need for sophisticated analysis, by assuming different soil conditions. In addition to the soil parameters (the total weight density ɣ, the angle of internal friction ϕ, the cohesive strength C) for the shell, core and filter within the dam, more parameters have been taken into consideration in predicting the critical factor of safety against slope failure to derive the empirical equation, which are: water depth H (m), coefficient of permeability k (m/s) and Seepage rate Qs (m3/s/m). The values of the computed factor of safety (Fs) using nine installed slope stability methods: Ordinary, Bishop, Morgenstern-Price, Janbu Generalized, Lowe-Karafiath, Corps of Engineers #1 and #2, Spencer and General Limit Equilibrium (GLE) are close to the safety factors values calculated using the general empirical equation which is a function of the soil and hydraulic parameters of the shell, core and filter within the dam.


Article
Earthquake Rating of Pore Water Pressure Generation– Induced Liquefaction of Earth Fill Embankments by Numerical Simulation
تقييم الهزة الارضية لضغط الماء المتولد المكون لتسيل سد املائي باستخدام المحاكاة العددية

Authors: Kareem Hassan Alwan --- Hussein Yousif Aziz --- Baydaa Hussain Maula
Journal: Muthanna Journal of Engineering and Technology(MJET) مجلة المثنى للهندسة والتكنولوجيا ISSN: 25720317 25720325 Year: 2017 Volume: 5 Issue: 3 Pages: 1-13
Publisher: Al-Muthanna University جامعة المثنى

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Abstract

The collapse of embankments, dams and slopes in the Arab world has become a phenomenon need to stand on the causes and consequences. The magnitude of the devastation due to Liquefaction phenomenon need to take the necessary precautions to reduce potential losses. Investigation of the (naturalist and imitation) of slopes and embankments stability is a hard geotechnical errand. Therefore embankments numerical study is implementing to diminish the situation of falling flat slants and rashes during shaking through appropriate FEM software. The FOS and liquefaction potential trend are obtained using finite element technique "Newmark" deformation analysis. The conformity of the analysis is verified by inquiry a layered slope of two altered soil deposits exposed to earthquake shaking. The conclusion from the study proved that the soil stratified trend has an immediate influence on the stability of the slope due to shaking and it is the simplest technique to reduce shaking effect. All combined phenomena which have delivered serious harm all over the world concentrated under quake examined under a record of 0.1 to 0.5g with particular case study to explore liquefaction zones due to the quake. Changeability of textural properties of soil layers affecting FOS and liquefaction has been examined for embankments. This study comes to put a highlight on Mosul Dam problem and give some suggestion and conclusions to its problems.

أصبح انهيار السدود والمنحدرات في العالم العربي ظاهرة تتطلب الوقوف على اسبابها وتبعاتها. ان حجم الدمارالذي تخلفه ظاهرة تسييل تحتاج إلى اتخاذ الاحتياطات اللازمة للحد من الخسائر المحتملة. التنبؤ و التحقيق في ديمومة المنحدرات (الطبيعية والاصطناعية) اصبح من اصعب المهمات الجيوتقنية,لذلك تساهم الدراسة العددية للمنحدرات في الحد من حالة انهيارها بسبب الاهتزازات من خلال برنامج مناسب للعناصر المحددة . ان معامل الامان لاستقرارية المنحدرات وظاهرة التسييل يتم بحثها من خلال محاكاة ميول متكونة من طبقتين من ترب المتغيرة الخواص والمعرضة للهزة الارضية عدديا باستخدام تقنية (نيومارك).الاستنتاج من هذه الدراسة أثبت أن التربة الطبقية الاتجاه له تأثير فوري على استقرار المنحدر خلال الهز حيث يمكن اعتبارها من أبسط الطرق لتقليل تأثير اهتزاز. ركزت هذه الدراسة على جميع الظواهر المصاحبة لظاهرة التسييل في ظل قوة هزة ارضية تتراوح ما بين(0.1-0.5) حيث تأتي هذه الدراسة لوضع تسليط الضوء على مشكلة سد الموصل وإعطاء بعض الاقتراحات والاستنتاجات الخاصة لمشكلة ذلك السد .

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