Effect of the Blocking Water and Limiting Discharge and Surrounding Rock Permeability on the Stability of Subsea Tunnel
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ORIGINAL PAPER
Effect of the Blocking Water and Limiting Discharge and Surrounding Rock Permeability on the Stability of Subsea Tunnel Genxiao Li . Chang Wang . Gang Wang . Zhiyong Xiao Feng Jiang
. Xianlong Wu .
Received: 23 April 2020 / Accepted: 7 September 2020 Ó Springer Nature Switzerland AG 2020
Abstract The influence of the sealing degree of the lining structure and the permeability of surrounding rock on the stability of the tunnel has always been the main topic concerned by the relevant engineering researchers. Based on the research background of the tunnel project of Qingdao metro line 1 and the in-depth analysis of the existing research results, this paper makes a systematic analysis and research on the influence mechanism of the sealing degree of the lining structure and the permeability of surrounding rock on the stability of the tunnel by the numerical simulation. The results show that the safety coefficient of each part of lining structure decreases with the increasing degree of tunnel sealing, which is manifested by the increase of the settlement of the vault and the convergence of the arch foot. In addition, the stability of surrounding rock becomes worse with the increase of permeability coefficient of surrounding G. Li G. Wang Z. Xiao (&) X. Wu F. Jiang Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao 266590, China e-mail: [email protected] C. Wang Shandong Donghai Real Estate Development Group Co., Ltd, Dezhou 253000, China G. Wang State Key Laboratory Breeding Base for Mine Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China
rock, which means the higher pore pressure and larger displacement of rock around the chamber. At the same time, the influence of the sealing degree of the lining structure on the stability of the tunnel will increase with the permeability of the surrounding rock. The works in this paper have guiding significance for the construction of submarine tunnel under different characteristics of surrounding rock and the selection of sealing degree of lining structure. Keywords Subsea tunnel Plugging degree Permeability coefficient Surrounding rock stability
1 Introduction With the advancement of science and technology, the undersea tunnel project has become the main way for people to break through geographical barriers, and their operational capabilities have brought great value to society. However, more attention should be paid to the overall stability of the tunnel and the stress of the lining structure due to their important on human transportation (Li et al. 2020a, b, 2013; Tan et al. 2018; Wu et al. 2005; Xin et al. 2014). In terms of the seepage field of subsea tunnels, many scholars have made some theoretical analytical solutions. Based on the basic principle of superposition, Harr (1963) obtained the influence of tunnel construction on the seepage field of su
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