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Geomechanics and Engineering Volume 21, Number 2, April25 2020, pages 153-164 DOI: http://dx.doi.org/10.12989/gae.2020.21.2.153 |
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Determination of effective parameters on surface settlement during shield TBM |
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Dongku Kim, Khanh Pham, Sangyeong Park, Ju-Young Oh and Hangseok Choi
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| Abstract | ||
| Tunnel excavation in shallow soft ground conditions of urban areas experiences inevitable surface settlements that threaten the stability of nearby infrastructures. Surface settlements during shield TBM tunneling are related to a number of factors including geotechnical conditions, tunnel geometry and excavation methods. In this paper, a database collected from a construction section of Hong Kong subway was used to analyze the correlation of settlement-inducing factors and surface settlements monitored at different locations of a transverse trough. The Pearson correlation analysis result revealed a correlation between the factors in consideration. Factors such as the face pressure, advance speed, thrust force, cutter torque, twin tunnel distance and ground water level presented a modest correlation with the surface settlement, while no significant trends between the other factors and the surface settlements were observed. It can be concluded that an integrated effect of the settlement-inducing factors should be related to the magnitude of surface settlements. | ||
| Key Words | ||
| shield TBM tunneling; surface settlement; effective parameter; Pearson correlation; twin tunnel | ||
| Address | ||
| Dongku Kim, Khanh Pham, Sangyeong Park and Hangseok Choi: School of Civil, Environmental and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, Republic of Korea Ju-Young Oh: Infrastructure ENG Team, Infra Construction ENG Group, Samsung C&T, 500 Sangil-ro, Gangdong-gu, Seoul, Republic of Korea | ||