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http://dx.doi.org/10.5762/KAIS.2021.22.6.267

An Comparative Study on the Method of Determining Allowable Horizontal Bearing Capacity of Piles  

Lee, Seung-Hyun (Dept. of Civil Infrastructure Systems and Safety Engineering, Sunmoon University)
Han, Jin-Tae (Korea Institute of Construction Technology)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.22, no.6, 2021 , pp. 267-274 More about this Journal
Abstract
Among several methods for determining the allowable lateral resistances of piles, the subgrade reaction method and ultimate lateral resistance method are generally used. To determine the effects of the soil conditions, pile head restraint conditions, and pile lengths on determining the allowable lateral resistances of piles, computations of the allowable lateral resistances of piles using the two methods were executed, and the computation results were compared. For piles in soft cohesive soil, the pile design is governed by the allowable lateral resistance of a pile from subgrade soil reaction method regardless of the pile head restraints conditions and pile lengths. The allowable lateral resistance of a pile from the ultimate lateral resistance governs the design as the undrained shear strength increases. Except for the case of a short pile, which is installed in loose granular soil, the allowable lateral resistance of a pile from ultimate lateral resistance governs the design of laterally loaded piles. According to this study, computation of the ultimate lateral resistance of a pile is needed, even though some opinions suggest that the design of a laterally loaded pile is satisfied only by the subgrade reaction method. The pile width barely influences the coefficient of horizontal subgrade reaction. Realistically, the effect of the pile width can be disregarded in the condition of common pile widths of 20~90cm.
Keywords
Allowable Lateral Resistance of a Pile; Subgrade Reaction Method; Cohesive and Cohesionless Soil; Pile Head Restraint Condition; Coefficient of Subgrade Reaction;
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