An-Najah Staff

Excavations of soil and rock are one of the most important elements in laying the subsurface structures. These excavations usually require excavation support systems that have fundamental influence on the safety, profitability, speed and quality of construction projects. Despite the great importance of the support systems, most designers and contractors know very little about their design and construction and they rely heavily on experience. The goal of this paper is to present a review of excavation support systems available worldwide and to survey the current state of practice in the local area (Nablus - Palestine), including available types, reasons for failure, and methods of design and construction of excavation support systems. This paper also suggested new techniques that may be adopted locally as an excavation support system. Conclusions of this study are presented and recommendations are suggested to identify what research and development should be carried out to improve the process of design and construction of excavation support systems.

Many excavation support systems are available, bored cast in-situ reinforced concrete cantilever sheet pile wall is the support system under consideration in this paper. There is no specific design and analysis procedure for such excavation support system and most designers rely on experience rather than on engineering methods. The aim of this paper is to present a simplified analysis and design method to the proposed excavation support systemin clayey soil, which will provide valuable design parameters, such as, penetration depth of the sheet pile, maximum bending moment and shear force, and maximum deflection at the top of the cantilever sheet pile for various arrangements of bored piles that form sheet piling. Key Words: Excavation Support Systems, Bored Cast in-situ Sheet Piles, Maximum Bending Moment, Penetration Depth, Deflection of Sheet Pile.

ملخص
الحفريات في التربة أو الصخر هي من أهم عناصر بناء المنشآت تحت سطح الأرض. إن هذه الحفريات بحاجة إلى نظام دعم مناسب؛وبالرغم من أهمية هذه العملية إلا أن معظم المصممين والمقاولين لا يعرفون إلا القليل عن تحليلها وتصميمها ويعتمدون بشكل أساسي على الخبرة السابقة. يهدف هذا البحث إلى وضع تحليل مبسط للاوتاد الكابولية المستخدمة لدعم دفع التربة الطينية الجانبي وذلك لتصميم هذا النظام. إن هذا البحث يعطي مقدار عمق اختراق الاوتاد للتربة والقيم القصوى لكل من قوى العزم والقص وكذلك القيمة الكبرى للازاحة الجانبية. فبذلك يقدم هذا البحث طريقة مبسطة وسهلة لمهندسي التصميم بدون الحاجة لفهم التحليل الدقيق والمعقد لنظام الدعم المقترح.