寒区隧道衬砌结构设计方法

发布时间：2019-01-28 18:03

【摘要】：在寒区冬冻夏融周期变化的环境下,冻害问题常影响到隧道结构及运营安全。为提高寒区隧道设计水平,节约工程建设成本,同时保证隧道安全正常运营,本文提出了新的寒区隧道衬砌结构设计思路:在提出寒区隧道衬砌设计流程的基础上,给出了不同冻土段衬砌结构选型的建议:冻岩隧道可采用三层复合式衬砌结构,工程冻土段隧道可采用柔性支护体系的复合式衬砌;系统总结了多年冻土段和工程冻土段的冻胀力控制措施;从结构设计角度,分析了铺设保温层的必要性取决于:冻胀力的量值和衬砌结构的耐久性;最后将提出的寒区隧道衬砌结构设计方法应用于实际工程,定量评估了姜路岭隧道围岩冻胀力控制措施的效果,且目前隧道现场科研监测未测到冻胀力;根据本文研究成果,优化了白茫雪山1号隧道衬砌结构的设计,考虑到保温层铺设成本较高且延缓了施工速度,调整了衬砌保温结构设计,减少保温层铺设长度3 810 m。
[Abstract]:Under the environment of winter freezing and summer thawing cycle in cold region, the problem of freezing damage often affects the tunnel structure and operation safety. In order to improve the design level of tunnel in cold area, save the construction cost and ensure the safe and normal operation of tunnel, this paper puts forward a new design idea of tunnel lining structure in cold area: based on the design flow of tunnel lining in cold area, Some suggestions are given for the selection of lining structure in different frozen soil sections: the three-layer composite lining structure can be used in frozen rock tunnel and the composite lining with flexible supporting system can be used in engineering frozen soil section tunnel; The control measures of frost heave force of permafrost section and engineering frozen soil section are summarized systematically, and the necessity of laying insulation layer is analyzed from the point of view of structure design: the value of frost heave force and the durability of lining structure; Finally, the design method of tunnel lining structure in cold region is applied to practical engineering, and the effect of frost heaving force control measures of surrounding rock of Jiangluling tunnel is quantitatively evaluated, and the frost heave force is not detected in the field research and monitoring of tunnel at present. According to the research results of this paper, the design of the lining structure of the No. 1 tunnel of Baimanxue Mountain is optimized. Considering the high cost of the insulation layer and the delay of the construction speed, the design of the lining insulation structure is adjusted and the laying length of the insulation layer is reduced to 3 810 m.
【作者单位】：同济大学地下建筑与工程系;岩土及地下工程教育部重点实验室(同济大学);福建省建筑科学研究院;中交第一公路勘察设计研究院有限公司;
【基金】：国家自然科学基金(41472248) 国家科技支撑计划项目(2014BAG05B05)
【分类号】：U455.91

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