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Article
Time-Dependent Behavior of Excavation in Cohesive Soils Using the Bounding Surface Model
التصرف الزمني للحفريات في الترب الطينية باستخدام نموذج السطح المحيط

Author: Dr. Qassun S. Mohammed Shafiqu قاسيون سعدالدين محمد شفيق قاسيون سعدالدين محمد
Journal: AL-NAHRAIN JOURNAL FOR ENGINEERING SCIENCES مجلة النهرين للعلوم الهندسية ISSN: 25219154 / eISSN 25219162 Year: 2011 Volume: 14 Issue: 1 Pages: 1-12
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

The study was to investigate the behavior of excavation in cohesive soils using the bounding surface model. The model and the finite element formulation are described and verified. Then the ground movements were predicted around an excavation in several types of cohesive soils. The results of the analysis demonstrate the effects of the consolidation process and permeability on the stability of the excavation and that the displacements at excavation boundaries increase with increasing permeability and time but at a lower rate as the permeability value decreased. Also the study shows a significant influence of the critical state parameters on the behavior of excavation in normally consolidated clay comparing with the surface configuration and hardening parameters of the model. Thus the modified Cam-clay model which employs a lower number of parameters can be used for the problems of excavation in normally consolidated clay.

الدراسه الحاليه هي لبحث تصرف الحفرة في الترب الطينيه باستخدام نموذج السطح المحيط. النموذج وقوانين طريقة العناصر المحدده تم شرحها وتدقيقها. ثم تم ايجاد الازاحات حول الحفرة في عده انواع من الترب الطينيه. نتائج التحليل اظهرت تاثيرات عملية الانضمام والنفاذية على استقراريه الحفرة وان الازاحات عند حدود الحفرة تزداد بزيادة النفاذية والزمن ولكن بنسب تقل مع نقصان قيم النفاذية. ايضا الدراسة اظهرت التاثير الواضح لمعاملات الحاله الحرجة على تصرف الحفر في الترب الطينية طبيعيه الانضمام مقارنة مع تاثير معاملات ترتيب السطح ومعاملات التصلب للنموذج. لهذا فان نموذج (Cam-Clay) المعدل والذي يستخدم معاملات اقل يمكن استخدامها في مسائل الحفر في الترب الطينيه طبيعيه الانضمام


Article
Simulation of Deep Excavation in Sand by Finite Element Using Hardening Soil Model (HSM)

Author: Zuhair Abd Hacheem
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2011 Volume: 29 Issue: 15 Pages: 3079-3096
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Deep excavation is very important problem in geotechnical engineering and use in construction of tunnel and underground structure. This paper study the deep excavation using Plaxis V8.2 engineering program and simulation the soil behavior by Hardening soil model (HSM) that very sensitive to descript the stress path of deep excavation and the model distinguishes between loading and unloading stiffness compares to The Mohr-Coulomb Model (MCM). The parametric study adopt the variation of sand density (loose, medium, and dense), and excavation width (B = 10,20, 40, 60, and 80 m). The result conclusions this parameter it's very important on horizontal wall deflection, bending moment of wall, interface stress between soil and wall, heave, and settlement of near ground surface, to make the deep excavation and don’t failureand reduce of on horizontal wall deflection, bending moment of wall, heave and settlements of near surface and contort on the near building to attainment the safe design and easy construction with optimum dimensions

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