Assessment of the Twin-Tunnel Interaction Mechanism in Kenny Hill Formation Using Contraction Ratio Method
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TECHNICAL NOTE
Assessment of the Twin-Tunnel Interaction Mechanism in Kenny Hill Formation Using Contraction Ratio Method Darvintharen Govindasamy1 • Mohd Ashraf Mohamad Ismail1 • Mohd Faiz Mohammad Zaki1,2 • Tan Yih Ken1 • Frankie Cheah1 • Suched Likitlersuang3
Received: 16 September 2019 / Accepted: 6 January 2020 Ó Indian Geotechnical Society 2020
Abstract Volume loss during tunneling excavation leads to ground deformation, which can damage adjacent surfaces or subsurface structures. Thus, tunnel design with proper estimation of ground deformation and realistic geotechnical simulation is essential for large-scale urban underground construction. In this study, subsurface characterization of the tunnel excavation section in Kenny Hill Formation (KHF) was conducted to develop 3D ground model and tunnel-filtered models and obtain ground sections through the spatial interpolation of borehole data using the Inverse Distance Weighting (IDW) method. Six greenfield ground sections were selected by using the tunnel-filtered model’s configuration of tunnels and available tunneling-induced ground movement data. Conceptual
& Mohd Ashraf Mohamad Ismail [email protected] Darvintharen Govindasamy [email protected]
models for finite element modeling were developed based on soil profiles, and the corresponding soil parameters were determined from ground sections. The strength and stiffness parameters of the Hardening Soil (HS) model were established using data from site investigation, in situ and laboratory tests, and empirical correlations with standard penetration test. The effectiveness of empirical correlations was determined through back analysis of twin-tunnel excavation in 2D finite element analysis using the contraction method and verified with monitored ground movement data. The numerical back-analyzed results of twin-tunnel excavation simulation using HS parameters obtained from a selected empirical correlation showed good agreement with construction-monitored ground movements. The application range of the values of contraction ratio was from 0.3 to 0.95%. Keywords Kenny Hill Formation Hardening Soil (HS) model Twin tunnel Contraction method Finite Element Analysis
Mohd Faiz Mohammad Zaki [email protected] Tan Yih Ken [email protected]
Introduction
Frankie Cheah [email protected]
Urban tunneling is commonly performed at shallow overburden depths and underneath existing buildings. Thus, examining the interaction of tunnels and their influence on the overall ground and other substructures is important. Volume loss during tunneling excavation leads to surface settlement and ground deformation, which can damage adjacent surfaces or subsurface structures. Therefore, thorough evaluation of ground deformation before construction is crucial. Ground movement due to tunneling should be controlled to minimize the damage to adjacent buildings.
Suched Likitlersuang [email protected] 1
School of Civil Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malay
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