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Research Article

Estimation of Permanent Displacement of Gravity Quay Wall Considering Failure Surface under Seismic Loading

지진 시 파괴면을 고려한 중력식 안벽의 영구변위 평가

Insuk Han1
,
Jae-Kwang Ahn2
,
Duhee Park3
,
Osoon Kwon4*
한 인숙1
,
안 재광2
,
박 두희3
,
권 오순4*
1Member, Researcher, Dept. of Coastal and Ocean Engrg., Korea Institute of Ocean Science and Technology
2Member, Researcher, Ph.D, Earthquake and Volcano Research Div., KMA.
3Member, Prof., Dept. of Civil and Environmental Engrg., Hanyang Univ.
4Member, Principal Researcher, Dept. of Coastal and Ocean Engrg., Korea Institute of Ocean Science and Technology
1정회원, 한국해양과학기술원 연구원
2정회원, 기상청 지진화산연구과 연구사
3정회원, 한양대학교 건설환경공학과 정교수
4정회원, 한국해양과학기술원 책임연구원
* Corresponding Author
30 April 2019. pp. 15-26
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Abstract

지진에 대한 중력식 안벽의 안정성은 구조물의 허용변위를 기준으로 평가하며, 외력으로 발생하는 변위를 계산하기 위하여 Newmark 활동블록 이론에 기초한 변위 경험식 혹은 수치해석을 사용한다. 수치해석의 경우 복잡한 지형 및 구조물에 대한 정밀한 분석이 가능하나 적절한 입력변수 및 환경설정의 어려움으로 전문가가 아니면 신뢰성 있는 결과 도출에 한계가 있다. Newmark 법의 변위 경험식은 지진파만을 가지고 영구변위를 추정하기에 수치해석보다 간편하여 널리 사용되고 있다. 하지만 변위 경험식들은 구조물의 특성과 활동면에 대한 파라메터가 없으며, 강체로 가정된 활동면에서 흙의 비선형 거동과 구조물과의 상호작용을 고려하지 않았다. 따라서 중력식 안벽의 지진 안정성 평가를 위해서는 앞서 언급한 한계점을 보완하는 새로운 변위 경험식이 필요하다. 본 연구에서는 수치해석을 통해 구조물 뒷채움재의 응답특성을 분석하여 최적의 활동면 산정법을 제시하고자 하였다. 이를 위해 유한요소해석을 수행하여 다양한 지진파에 따른 응답특성과 응력-변형률 관계를 분석하였다. 그 결과 뒷채움재의 응답특성과 활동면은 입력 지진파에 따라 달라지는 것으로 나타났다.

The stability of the gravity quay wall against earthquakes is evaluated on the basis of the allowable displacement of the wall. To estimate the displacement caused by external forces, empirical equations based on the Newmark sliding block method or numerical analysis are widely used. In numerical analysis, it is possible to analyze precisely a complicated site and structure, but difficult to set the appropriate parameters and environments; there are limitations in obtaining reliable results, depending on one’s level of expertise. The Newmark method, with only seismic motions, is widely used because it is simpler than numerical simulations when estimating permanent displacement. However, the empirical equations do not have any parameters for the response characteristics and sliding block of the structure, and sliding blocks being assumed as rigid bodies does not consider the nonlinear behavior of the soil and interaction with the structure. Therefore, in order to evaluate the seismic stability of the gravity quay wall, a newly-developed empirical equation is needed to overcome the above-mentioned limitations. In this study, numerical simulations are performed to analyze the response characteristics of the backfill of the structure, and to propose an optimal method of calculating the active area. For this purpose, finite element analyses were performed to analyze the response characteristics, and stress-strain relationships for various seismic motions. As a result, the response characteristics, sliding block, and failure surface of the backfill vary depending on the input seismic motions.

Keywords
Failure surface
Permanent displacement
Nonlinear
Seismic loading
Numerical Simulation

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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 : 35
  • No :4
  • Pages :15-26
  • Received Date : 2018-12-10
  • Revised Date : 2019-03-23
  • Accepted Date : 2019-04-02
  • DOI :https://doi.org/10.7843/kgs.2019.35.4.15
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