Assessment of strut forces for braced excavation in clays from numerical analysis and field measurements |
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| Institution: | 1. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Ministry of Education, Chongqing 400045, China;2. School of Civil Engineering, Chongqing University, Chongqing 400045, China;3. School of Civil and Environmental Engineering, Nanyang Technological University, 639798, Singapore;4. IIIBIT-Sydney, Federation University, NSW 2000, Australia;5. Geotechnical and Tunnels Division, Land Transport Authority, 219428, Singapore;1. Glenn Department of Civil Engineering, Clemson University, Clemson, SC 29634, USA;2. National Central University, Jhongli City, Taoyuan County 32001, Taiwan, ROC;3. Trinity Foundation Engineering Consultants, Co., Ltd., Taipei, Taiwan, ROC;1. Department of Civil Engineering, National Kaohsiung University of Applied Sciences, 415, Chen Kung Road, Kaohsiung 807, Taiwan;2. Department of Civil and Construction Engineering, National Taiwan University of Science and Technology (Taiwan Tech), 43, Sec. 4, Keelung Rd., Taipei 106, Taiwan;3. Department of Civil Engineering, National Cheng Kung University, 1, University Rd., Tainan 701, Taiwan;1. School of Highway, Chang’an University, Xi’an, Shaanxi 710054, China;2. Institute of Geotechnical Engineering, Southeast University, Nanjing 211189, China;3. School of Engineering, University of Warwick, Coventry CV4 7AL, UK;1. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing, China;2. School of Civil Engineering, Chongqing University, Chongqing, China;3. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore;1. Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand;2. Geotechnical Research Unit, Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand |
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| Abstract: | One important consideration in the design of a braced excavation system is to ensure that the structural bracing system is designed both safely and economically. The forces acting on the struts are often determined using empirical methods such as the Apparent Pressure Diagram (APD) method developed by Peck (1969). Most of these empirical methods that were developed from either numerical analysis or field studies have been for excavations with flexible wall types such as sheetpile walls. There have been only limited studies on the excavation performance for stiffer wall systems such as diaphragm walls and bored piles. In this paper, both 2D and 3D finite element analyses were carried out to study the forces acting on the struts for braced excavations in clays, with focus on the performance for the stiffer wall systems. Subsequently, based on this numerical study as well as field measurements from a number of reported case histories, empirical charts have been proposed for determining strut loads for excavations in stiff wall systems. |
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| Keywords: | Apparent pressure diagram Braced excavation Clay Strut forces Finite element analysis Stiff walls |
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