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Geomechanics and Engineering
  Volume 21, Number 2, April25 2020, pages 153-164

Determination of effective parameters on surface settlement during shield TBM
Dongku Kim, Khanh Pham, Sangyeong Park, Ju-Young Oh and Hangseok Choi

    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
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

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