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Hybrid Analysis of Displacement Behavior and Numerical Simulation on Tunnel Design  

Jeong, Yun-Young (Tunnel Division, Chungsuk Eng.Co.)
Han, Heui-Soo (Dept. of Civil Engineering, Kumoh National of Technology)
Lee, Jae-Ho (School of Architecture & Civil Engineering, Kyungpook National University)
Publication Information
The Journal of Engineering Geology / v.20, no.1, 2010 , pp. 47-60 More about this Journal
Abstract
This study is focused on the analysis of tunnel behavior to estimate the stability on tunnel design. An estimation method was proposed as a hybrid consideration, which contains the displacement analysis by 3D numerical simulation, the maximum displacement obtained after field measurement, and an assessment of tunnel stability using a deformation analysis proposed by Sakurai(1988, 1997). The points of case study by Sakurai(1988, 1997) were replotted considering his analysis. From the new analysis of the tunnel case study, the trend line for analyzed points is analogized, which curve is divided into stable, unstable and failure zone. To evaluate the estimation method, a special shape of railway tunnel was selected, which are the Inchon international airport rail way connected to subway line 9 in Gimpo, Korea. The point s of upper and below track on the Inchon international airport rail way were satisfied to the stability of tunnel after reinforcing. Also the points shows the higher apparent Young's modulus, which resulted from improvement on shear strength by the micro silica grouting and the supporting of umbrella method. Therefore, if new analysis used, proper tunnel reinforcing method could be selected according to tunnel strain and geological property.
Keywords
Tunnel deformation; Hybrid analysis; Sakurai's case study; Critical strain; Apparent young's modulus;
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