쉴드터널 라이닝 세그멘트의 해석과 거동 특성

Abstract

The shield tunneling method in downtown construction is increasingly used to minimize environmental damages and civil complaint at the residential overcrowding area. The lining segment which is the main structure of the shield tunnel consists of joints, not continua. Past international and domestic design data have been commonly used for design practices without specific verification about the structural analysis model, design load, and affection of the soil constant of the lining segment. In this study, the propriety is estimated through the comparison between analytical solution and numerical solution for segment analysis and design models of the shield tunnel which is being used internationally and domestically. As a result, the full-circumferential beam jointed spring model (1R-S0) is suggested by considering aspects of convenient use, application to field condition, and accuracy of analysis result. With suggested model, the parameter analysis was conducted for joint stiffness, ground rigidity, joint distribution, and joint number. From the result, this study shows that bending moments of jointed lining segments converge into at the certain rate of the value of bending moment which is generated at non-jointed continuous lining segments where ground rigidity is beyond certain value. Also, the bending moment in crown and invert than in springline and the vertical displacement than horizontal displacement in regard to joint distribution are the more largely affected by the smaller joint stiffness.