Analysis of Coefficient of Dynamic Horizontal Subgrade Reaction and Correlation Factor (α) Considering Shear Wave Velocity of Soil

Gun-Woo Kim; Hyun-Sung Lim; Su-Min Song; Sang-Seom Jeong

doi:10.7843/kgs.2020.36.11.7

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2020 Vol.36, Issue 11 Next Page

Research Article

Analysis of Coefficient of Dynamic Horizontal Subgrade Reaction and Correlation Factor (α) Considering Shear Wave Velocity of Soil 지반의 전단파 속도를 고려한 동적 수평지반반력계수와 보정계수(α) 분석

30 November 2020. pp. 7-20

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Abstract

In this study, the dynamic behavior of a single pile foundation was investigated by using an analytical and numerical studies. The emphasis was given on quantifying a function about the coefficient of dynamic horizontal subgrade reaction from 3D analysis. Based on the numerical analysis, a modified correction factor (α), which is used to obtain the coefficient dynamic horizontal subgrade reaction, was proposed by considering shear wave velocity of soil and confining stress. It was found that the prediction by pseudo-static analysis using the proposed coefficient is in good agreement with the general trends observed by dynamic analysis, and it represents a practical improvement in the prediction of behavior for pile foundations subjected to dynamic loads.

Keywords

Coefficient of dynamic horizontal subgrade reaction

Correction factor (α)

Pile foundation

Pseudo- static analysis

Shear wave velocity

본 연구에서는 말뚝기초를 대상으로 지반조건을 고려한 동적 수평지반반력계수를 제안하기 위하여 수치해석을 수행하였다. 3차원 유한차분 프로그램을 사용하여, 다양한 지반의 전단파 속도에 따라 동적수치해석을 수행하였다. 수치해석 결과로부터 동적 p-y 곡선을 도출하여 동적 수평지반반력계수를 계산하는 데 필요한 보정계수(α)를 산정하였다. 분석결과, 본 연구에서 산정된 보정계수(α)는 기존 도로교 설계기준(2015)에 제시된 획일적인 값(α=2)이 아니라 지반의 전단파 속도와 구속압에 매우 큰 영향을 받는 것을 알 수 있었으며 이를 고려한 함수식으로 제안하였다. 제안된 α의 적용성 분석을 위해 서로 다른 해석 기법(등가정적해석방법과 동적해석방법)에서의 적용성을 비교하였다. 그 결과, 제안된 보정계수(α)를 사용하는 방법은 기존 동적 수평지반반력계수를 사용하는 방법에 비해 지반-말뚝 시스템의 수평거동 특성을 비교적 적절하게 예측함을 알 수 있었다.

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Information

Publisher :The Korean Geotechnical Society
Publisher(Ko) :한국지반공학회
Journal Title :Journal of the Korean Geotechnical Society
Journal Title(Ko) :한국지반공학회 논문집
Volume : 36
No :11
Pages :7-20
Received Date : 2020-07-12
Revised Date : 2020-11-08
Accepted Date : 2020-11-08
DOI :https://doi.org/10.7843/kgs.2020.36.11.7

Journal of the Korean Geotechnical Society ISSN:1229-2427(Print) 2288-646X(Online) 한국지반공학회 논문집

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