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| Research on theDesignMethods ofComposite TunnelLining on Consideration of Environmental Effect |
| XIAO M ing-qing1, SUN W en-hao2 |
| 1. Southwest Jiaotong University, Chengdu, Sichuan 610031, China; 2. China Railway Siyuan Survey and Design Group Co., Ltd, Wuhan, Hubei 430063, China |
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Abstract Research purposes: The various influencesof the environmentaleffectson preliminary bracing and secondary lining ofmountain composite lining tunnels exis,t especially on young sprayed concrete. As the young sprayed concrete is thin, the influence of the leakage corrosion on thematerial isnotnegligible, exceptnecessarily considering the contact corrosion of the environmen.t Thispaperpointsout that the designmethodsofcomposite lining need consideration of the particularenvironmenteffects according to the features of tunnel construction.
Research conclusions:As the leakage corrosion is very severewhen the thickness ofyoung sprayed concrete is thin and the hydraulic pressure isbig, so itshould be considered in the design. Because the preliminary bracing permanencewill be influenced differently in the differentenvironmentconditions, so the designmethods should synthetically consider the environment corrosion, hydraulic pressure, watermagnitude, etc; For the design method of taking the preliminary bracing asmain bearing structure, only the supervisory results during tunnel construction is notenough to evaluate the tunnel security of thewhole service life.
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Received: 07 September 2009
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2009, Vol. 26 
