Case Studies of Ground Subsidence Risk Ratings (GSRp) Applied to the Excavation Sites

Sang-Sik Shin; Myeong-Hyek Ihm; Hak Joon Kim

doi:10.9720/kseg.2019.3.289

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2019 Vol.29, Issue 3 Preview Page Next Page

Research Article

Case Studies of Ground Subsidence Risk Ratings (GSRp) Applied to the Excavation Sites 지반함몰 위험등급 분류(GSRp)의 굴착현장 사례 연구

30 September 2019. pp. 289-302

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Abstract

As the occurrence of ground subsidence near the excavation site increases recently, studies are being conducted to predict the possibility of ground subsidence prior to excavation. In this study, the ground subsidence risk rating for pre-excavation (GSRp) developed by the previous study was applied to actual excavation sites to verify its applicability. The final results for the evaluation of the ground subsidence risk level for five excavation sites revealed that GSRp scores were calculated between 40 and 79 points and classified mainly into grades II (Good Ground)~III (Fair Ground). In order to verify the evaluation method, the obtained GSRp grades were compared with the measured horizontal displacements. The horizontal displacements measured in five excavation sites were between 25% and 47% of the allowable displacement, which were well agreed with the low subsidence risk level obtained from GSRp calculation. It is expected that the GSRp method can be used as an evaluation tool for predicting the risk of ground subsidence before excavation if GSRp is verified and supplemented through the additional research for the poor soil with the high risk of ground subsidence.

Keywords

ground subsidence

ground subsidence risk ratings

GSRp

최근 굴착현장 인근의 지반함몰 발생사례가 증가함에 따라 사전에 지반함몰 가능성을 예측할 수 있는 연구가 진행되고 있다. 본 연구에서는 기존 연구에 의해 개발된 굴착 전 지반함몰 위험등급 평가 시트인 GSRp를 실제 굴착 현장에 적용하여 현장 적용성을 검증하였다. 각각 다른 지반조건을 가진 5개 굴착현장에 대하여 지반함몰 위험등급을 평가한 결과, GSRp 점수는 40~79점으로 산출되어 대부분 II등급(우수지반)~III등급(양호지반)으로 분류되었다. 평가방법의 신뢰성 검증을 위하여 계측결과에 의해 실측된 수평변위량과 비교 분석하였다. 본 연구현장의 수평변위량은 허용치의 25~47%로 나타나 지반함몰 위험이 낮게 평가된 GSRp 결과와 일치하였다. 향후 지반함몰 위험성이 높은 불량한 지반을 대상으로 하는 현장 적용에 대한 연구가 진행되어 검증과 보완이 이루어진다면 GSRp 평가방법이 굴착 전 지반함몰 위험도를 예측하는 평가 도구로 활용될 수 있을 것으로 기대된다.

키워드

반함몰

지반함몰 위험등급

GSRp

References

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Information

Publisher :Korean Society of Engineering Geology
Publisher(Ko) :대한지질공학회
Journal Title :The Journal of Engineering Geology
Journal Title(Ko) :지질공학
Volume : 29
No :3
Pages :289-302
Received Date : 2019-09-02
Revised Date : 2019-09-18
Accepted Date : 2019-09-19
DOI :https://doi.org/10.9720/kseg.2019.3.289

The Journal of Engineering Geology ISSN:1226-5268(Print) 2287-7169(Online) 지질공학

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