Wall displacement prediction of circular,D shaped and modified horseshoe tunnels in non-hydrostatic stress fields |
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| Affiliation: | 1. Department of Mining Engineering, Faculty of Engineering, University of Kurdistan, Sanandaj, Iran;2. Department of Mining Engineering, Shahid Bahonar University of Kerman, Kerman, Iran;1. Center for Hypergravity Experiment and Interdisciplinary Research, Zhejiang University, Hangzhou 310058, China;2. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China;3. ENN Natural Gas Co., Ltd., Langfang 065001, China;4. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;5. State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University, Nanchang 330013, China |
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| Abstract: | The prediction of the magnitude and development of the expected displacements has an important impact on a large number of issues during tunnel construction. Convergence confinement method (CCM) is based on the analysis of the stress and strain state that develops in the rock around a circular tunnel capable of determining wall displacement. The radial displacement given by RocSupport that is based on convergence-confinement method (CCM) is valid for the tunnel circular cross section driven in the hydrostatic state of stress. In this paper several equations and graphs are presented using numerical modeling (FLAC3D) to obtain corrective coefficients to be applied to the values of wall displacement of circular tunnels in hydrostatic state of stress given by analytical method (RocSupport) for the prediction of maximum wall displacement and displacements of different parts of circular, D shaped and modified horseshoe tunnels in non-hydrostatic stress fields. |
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