Evaluation of Lateral Subgrade Reaction Coefficient Considering Empirical Equation and Horizontal Behavior Range of Large Diameter Drilled Shaft

IF 0.4 Q4 ENGINEERING, GEOLOGICAL
Woo-Yeol Yang, T. Hwang, Bumjoo Kim, Seong-Bak Park, K. Lee
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引用次数: 1

Abstract

The lateral bearing characteristics of large diameter drilled shaft depend greatly on the stiffness of the pile, horizontal subgrade reaction of adjacent ground. In particular, the empirical evaluation results of the horizontal subgrade reaction coefficient which are widely used in pile design are very important factors in evaluating the lateral bearing capacity of drilled shaft because the difference in bearing capacity depends on the estimated result. Nevertheless, the evaluation of the horizontal subgrade reaction coefficient on the large diameter drilled shaft is insufficient. In addition, although the range of influence and the location of the maximum moment which is the weaken zone on the pile may be correlated and relationship of these are major consideration in determining the reinforced zone of drilled shaft, the previous studies have not been evaluated it. In this study, the field test and nonlinear analysis of large diameter drilled shaft were performed to evaluate the horizontal subgrade reaction coefficient and to investigate the relationship between the influence range 1/ of the pile and the location of the maximum moment zm. In the result, the lateral bearing capacity of drilled shaft showed a difference in results by about 190% according to the empirical equation on the horizontal subgrade reaction coefficient. And the relationship between the influence range of the pile and the location of the maximum moment was evaluated as a linear relationship depending on the soil density.
考虑经验方程和大直径钻杆水平行为范围的横向路基反力系数评价
大直径钻孔井的横向承载特性在很大程度上取决于桩的刚度、邻近地面的水平路基反力。特别是水平路基反力系数的经验评价结果,是评价钻孔竖井横向承载力的重要因素,在桩基设计中得到了广泛的应用。然而,对于大直径钻孔井的水平路基反力系数的评价还不够充分。此外,虽然影响范围和最大弯矩在桩上的位置(即软弱区)可能是相互关联的,并且它们之间的关系是确定钻孔井加固区的主要考虑因素,但以往的研究尚未对其进行评价。本研究通过大直径钻孔井的现场试验和非线性分析,评估水平路基反力系数,探讨桩的影响范围1/与最大弯矩zm位置的关系。结果表明,根据水平路基反力系数经验方程,钻孔竖井的横向承载力计算结果相差约190%。并将桩的影响范围与最大弯矩位置之间的关系评价为随土密度的线性关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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