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Longitudinal Arching Characteristics Around the Face of a Soil-Tunnel with Crown and Face-Reinforcement  

Kwon Oh-Yeob (School of Dept. of Civil Engrg., Koonkuk Univ.)
Choi Yong-Ki (Chairman, soil Co. Ltd.)
Lee Sang-Duk (School of Dept. of Environmental & Urban Engrg. Ajou Univ.)
Kim Young-Gun (Busan Cable Tunnel Const., Korea Electronic Power Copr.)
Publication Information
Journal of the Korean Geotechnical Society / v.20, no.9, 2004 , pp. 133-144 More about this Journal
Abstract
Pre-reinforcement ahead of a tunnel face using long steel or FRP (Fiberglass Reinforced Plastic) pipes in NATM(New Austrian Tunnelling Method), known as the RPUM(Reinforced Protective Umbrella Method) or UAM (Umbrella Arch Method), is the promising method to sustain the stability of a shallow tunnel face and reduce the ground settlements. In addition, horizontal reinforcing of the face is recently emphasized to improve the stability of the face. However, the characteristics on longitudinal arching around the face have not yet been established quantitatively with the RPUM (crown-reinforcing) and/or the face horizontal reinforcing. In this study, therefore, the behavior of cohesionless soil around the face reinforced by the reinforcing member representing the RPUM and horizontal reinforcing is investigated through two-dimensional laboratory model tests. A series of tests were carried out on various conditions by changing lengths and angles of the reinforcing members. Based on the vertical pressure around the face, the characteristics of longitudinal arching have been found for the case of the non-reinforced and the reinforced.
Keywords
Crown-reinforced; Face-reinforced; Horizontal pressure; Longitudinal arching; Settlement ratio; Vertical pressure;
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