The Calculation Method of Apparent Earth Pressure in Multi-Layered Ground with Clay and Sand

Byung-Il Kim; Kang-Han Hong; Jin-Hae Kim; Sang-Jae Han

doi:10.12814/jkgss.2021.20.1.021

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2021 Vol.20, Issue 1 Preview Page Next Page

Research Article

The Calculation Method of Apparent Earth Pressure in Multi-Layered Ground with Clay and Sand 점토와 모래가 포함된 다층지반의 경험토압 산정방법에 관한 연구

30 March 2021. pp. 21-34

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Abstract

In this study, to solve a problem that cannot consider the contribution effect of each layers when the apparent earth pressure in homogeneous ground is applied to multi-layered ground, the measured earth pressures at World were investigated and analyzed. It has been confirmed that the apparent earth pressure in mulit-layered ground is different from single ground and that the extra layer's contribution to the earth pressure cannot be considered. The conventional method of calculating the apparent earth pressure for single ground was extended to mulit-layered ground, and proposed and verified the applicable method for both single and mulit-layered ground. The proposed methods predicted the earth pressure closer to the measurements at the excavation depth of 0.1Z/H or below, and the prediction reliability was evaluated to be better than the conventional method. Among the proposed methods, the method of considering the area ratio of the active failure has a geotechnical validity and predicts the most similar results to the actual earth pressure. To confirm the applicability of the proposed methods, it was presented by comparing and analyzing the results of the proposed methods with the conventional method for the actual case.

Keywords

Apparent earth pressure

Multi-layered ground

Active failure

Thickness

단일지반에서의 경험토압을 다층지반에 적용할 때 각 지층이 토압에 기여하는 효과를 고려할 수 없는 문제 등을 해결하고자 국내외에서 지반굴착시 측정된 토압을 조사하고 분석하였다. 다층지반의 토압은 단일지반의 경험토압과 상이하고, 대표 토질이 아닌 지층의 토압 기여 효과를 고려할 수 없음을 확인하였다. 본 연구에서는 기존의 단일지반에 대한 경험토압 산정방법을 다층지반까지 확장하여 단일지반과 다층지반 모두 적용 가능한 방법을 제안하고 검증하였다. 제안방법은 굴착심도 0.1Z/H 이하에서 실측값에 더 근접한 토압을 예측하는 등 기존 단일지반의 토압보다 예측 신뢰도가 우수한 것으로 평가되었다. 제안방법 중 주동상태에서의 파괴면적비를 고려하는 방법이 지반공학적 타당성을 갖추고도 실측토압과 가장 유사한 결과를 도출하였다. 또한, 제안방법의 적용성을 확인하고자 실제 설계사례에 대해 제안방법과 기존 방법의 설계 결과를 비교 분석하여 제시하였다.

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Information

Publisher :Korean Geosythetics Society
Publisher(Ko) :한국지반신소재학회
Journal Title :Journal of the Korean Geosynthetics Society
Journal Title(Ko) :한국지반신소재학회 논문집
Volume : 20
No :1
Pages :21-34
Received Date : 2020-12-21
Revised Date : 2021-02-24
Accepted Date : 2021-03-08
DOI :https://doi.org/10.12814/jkgss.2021.20.1.021

Journal of the Korean Geosynthetics Society ISSN:2508-2876(Print) 2287-9528(Online) 한국지반신소재학회 논문집

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