Characteristics and prediction methods for tunnel deformations induced by excavations

Zheng, Gang; Du, Yiming; Cheng, Xuesong; Diao, Yu; Deng, Xu; Wang, Fanjun

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자료유형: 학술저널

저자정보: Zheng, Gang (MOE Key Laboratory of Coast Civil Structure Safety, Tianjin University) Du, Yiming (MOE Key Laboratory of Coast Civil Structure Safety, Tianjin University) Cheng, Xuesong (MOE Key Laboratory of Coast Civil Structure Safety, Tianjin University) Diao, Yu (MOE Key Laboratory of Coast Civil Structure Safety, Tianjin University) Deng, Xu (MOE Key Laboratory of Coast Civil Structure Safety, Tianjin University) Wang, Fanjun (MOE Key Laboratory of Coast Civil Structure Safety, Tianjin University)

저널정보: 테크노프레스 Geomechanics & engineering Geomechanics & engineering 제12권 제3호

발행연도: 2017.1

수록면: 361 - 397 (37page)

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The unloading effect from excavations can cause the deformation of adjacent tunnels, which may seriously influence the operation and safety of those tunnels. However, systematic studies of the deformation characteristics of tunnels located along side excavations are limited, and simplified methods to predict the influence of excavations on tunnels are also rare. In this study, the simulation capability of a finite element method (FEM) considering the small-strain characteristics of soil was verified using a case study. Then, a large number of FEM simulations examining the influence of excavations on adjacent tunnels were conducted. Based on the simulation results, the deformation characteristics of tunnels at different positions and under four deformation modes of the retaining structure were analyzed. The results indicate that the deformation mode of the retaining structure has a significant influence on the deformation of certain tunnels. When the deformation magnitudes of the retaining structures are the same, the influence degree of the excavation on the tunnel increased in this order: from cantilever type to convex type to composite type to kick-in type. In practical projects, the deformation mode of the retaining structure should be optimized according to the tunnel position, and kick-in deformation should be avoided. Furthermore, two methods to predict the influence of excavations on adjacent tunnels are proposed. Design charts, in terms of normalized tunnel deformation contours, can be used to quantitatively estimate the tunnel deformation. The design table of the excavation influence zones can be applied to determine which influence zone the tunnel is located in.

#deep excavation #tunnel #influence zone #deformation mode #prediction method

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