Influences of Lining Stiffness Distribution on Frost Heave Pressure on Cold Regional Tunnels
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摘要: 为保证衬砌结构具有合理的安全度,考虑冻胀水体、衬砌和围岩之间的共同作用特征,提出了约束冻胀模型和冻胀压力的理论计算式,并采用考虑围岩抗力的荷载-结构模型求解衬砌刚度分布.在此基础上,以结构安全度为度量指标,探讨了冻胀压力与衬砌刚度之间的关系.结果表明:等厚衬砌断面结构刚度在拱顶及仰拱中部较小,边墙部位较大;增大衬砌厚度使衬砌刚度增大,导致冻胀压力增大,同时也提高了衬砌承载能力;增大衬砌厚度导致的冻胀压力增大不如衬砌承载能力的提高显著,因此,增大衬砌厚度是提高衬砌抗冻能力的有效措施.Abstract: To ensure that lining has a suitable safety degree,a constrained frost heave model was proposed based on the interaction characteristic of frozen water body,lining and surrounding rock,and the corresponding analytical expression of frost heave pressure was give.A load-structure model was adopted to analyze the distribution of lining stiffness.In addition,the relationship between frost heave pressure and lining stiffness was investigated by taking the structure safety degree as an assessment index.The research result shows that the stiffness distribution of lining with identical thickness is uneven-lining stiffness is small at the arch crown of a tunnel and middle part of its inverted arch,while it is large along its side walls.The increase in the thickness of lining will make lining stiffness raise to result in a great frost heave pressure and the load-bearing capacity of lining increase significantly.As a result,increasing the thickness of lining is still an effective measure to improve the anti-freeze ability of cold regional tunnels.
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王建宇,胡元芳.隧道衬砌冻胀压力问题初探[J].铁道工程学报,2004(1):87-93.WANG Jianyu,HU Yuanfang.A discussion on frost heave force action on tunnel lining[J].Journal of Railway Engineering Society,2004(1):87-93.[2] 张祉道,王联.高海拔及严寒地区隧道防冻设计探讨[J].现代隧道技术,2004(3):1-6.ZHANG Zhidao,WANG Lian.Discussion on the design of tunnels in high elevation and bitter cold region[J].Modern Tunnelling Technology,2004(3):1-6.[3] 范磊,曾艳华,何川,等.寒区硬岩隧道冻胀力的量值及分布规律[J].中国铁道科学,2007,28(1):44-49.FAN Lei,ZENG Yanhua,HE Chuan,et al.Magnitude and distribution of frost heave force for cold region strong sock tunnels[J].China Railway Science,2007,28(1):44-49.[4] 张德华,王梦恕,谭忠胜,等.风火山隧道围岩冻胀对支护结构体系的影响[J].岩土工程学报,2003,25(5):571-573.ZHANG Dehua,WANG Mengshu,TAN Zhongsheng,et al.Effect of frost heaving on tunnel supporting systems of Fenghuoshan railway tunnel[J].Chinese Journal of Geotechnical Engineering,2003,25(5):571-573.[5] 赖远明,吴紫旺.寒区隧道渗水围岩冻胀对衬砌的影响和防冻胀设计计算研究[R].兰州:中国科学院寒区旱区环境与工程研究所,2000.[6] 中华人民共和国交通部.JTG D70-2004 公路隧道设计规范[S].北京:人民交通出版社,2004.[7] 中华人民共和国铁道部.TB 10003-2005 铁路隧道设计规范[S].北京:中国铁道出版社,2005.
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