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Geomechanics and Engineering Volume 16, Number 3, October30 2018 , pages 285-293 DOI: https://doi.org/10.12989/gae.2018.16.3.285 |
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Field and laboratory assessment of ground subsidence induced by underground cavity under the sewer pipe |
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Suk-Min Kong, Dong-Min Kim, Dae-Young Lee, Hyuk-Sang Jung and Yong-Joo Lee
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| Abstract | ||
| In densely populated urban areas with a large amount of infrastructure, ground subsidence events can result in massive casualties and economic losses. In South Korea, the incidence of ground subsidence in urban areas has increased in recent years and the number of underground cavities suspected of causing such events has significantly increased. Therefore, it is essential to develop techniques to prevent the occurrence of underground and ground subsidence. In this study, a field test, laboratory test, and numerical analysis were conducted to determine the optimal compaction degree of the upper support layer of any underground cavity below the level of sewer pipes in order to prevent such cavities from collapsing and leading to ground subsidence accidents. During the field test, an underground cavity was simulated using ice, and the generation of the cavity was confirmed using ground penetrating radar. The ground investigation was performed using a cone penetration test, and the compaction of the ground where ground subsidence occurred was evaluated with a laboratory test. The behaviour of the ground under various conditions was predicted using a numerical analysis based on the data obtained from the field test and previous studies. Based on these results, the optimal compaction degree of the ground required to prevent the underground cavity from causing ground subsidence was predicted and presented. | ||
| Key Words | ||
| ground subsidence; compaction; CPT; field test; laboratory test; numerical analysis | ||
| Address | ||
| Suk-Min Kong and Yong-Joo Lee: Department of Civil Engineering, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Korea Dong-Min Kim and Dae-Young Lee: Geotechnical Engineering Research Division, Korea Institute of Civil Engineering and Building Technology, 283, Goyang-daero, Ilsanseo-gu, Goyang-si, Gyeonggi-do, 10223, Korea Hyuk-Sang Jung: Department of Railroad Construction and Safety Engineering, Dongyang University, 145 Dongyangdaero, Punggi, Yeongju, Gyeongbuk, 750-711, Korea | ||