复合式衬砌隧道总安全系数设计法修正与应用研究
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摘要
为评价复合式衬砌这一整体结构的安全性,对以往所建立的复合式衬砌隧道总安全系数设计法的不合理之处进行修正,并再次分析不同铁路隧道的安全性,同时与挪威Q法支护参数进行对比,最后结合案例说明该方法在断面形式比选方面的应用。结果表明:1)所建立的总安全系数设计法可以为初期支护和复合式衬砌的支护构件选择、量化设计和整体优化设计提供一定的理论基础。2)采用总安全系数设计法对不同铁路隧道安全系数计算的结果与现场实际施工情况、既有隧道病害情况基本相符。3)挪威Q法提出的支护参数如果用于我国时速350 km的高速铁路双线隧道,Ⅲ、Ⅳ级围岩总安全系数满足要求且较为经济,但Ⅴ级围岩安全系数偏低;采用耐久性锚杆有利于充分发挥锚杆-围岩承载拱的支护作用,从而可以减少喷层和二次衬砌的强度,提高经济性。4)总安全系数设计法可以用于隧道断面形式与支护参数的精细比选。
The unreasonableness of the design method for total safety factor of composite lining tunnel established in the past is modified; the safety of different railway tunnels is analyzed; the method is compared with the support parameters of the Norwegian Q method; and the method is applied to the comparison and selection of tunnel cross-sections of a tunnel. The results show that:(1) The total safety factor design method can provide a theoretical basis for the selection, quantitative design and overall optimization design of support components for primary support and composite lining.(2) The calculation results of safety factors of different railway tunnels by using the total safety factor design method are basically consistent with the actual construction conditions and the existing tunnel diseases.(3) The support parameters proposed by Q method in Norway applied to 350 km/h high-speed double-track railway tunnel in Grade Ⅲ and Grade Ⅳ surrounding rock in China can meet the safe and economic requirements, and that applied to 350 km/h double-track high-speed railway tunnel in Grade Ⅴ surrounding rock in China is with low safety factor; the durable bolts are conducive to giving full play to the supporting role of bolt-surrounding rock bearing arch, thus reducing strength of the shotcrete layer and the secondary lining so as to improve the economic efficiency.(4) The total safety factor design method can be used for the precise selection of tunnel cross-section form and support parameters.
The unreasonableness of the design method for total safety factor of composite lining tunnel established in the past is modified; the safety of different railway tunnels is analyzed; the method is compared with the support parameters of the Norwegian Q method; and the method is applied to the comparison and selection of tunnel cross-sections of a tunnel. The results show that:(1) The total safety factor design method can provide a theoretical basis for the selection, quantitative design and overall optimization design of support components for primary support and composite lining.(2) The calculation results of safety factors of different railway tunnels by using the total safety factor design method are basically consistent with the actual construction conditions and the existing tunnel diseases.(3) The support parameters proposed by Q method in Norway applied to 350 km/h high-speed double-track railway tunnel in Grade Ⅲ and Grade Ⅳ surrounding rock in China can meet the safe and economic requirements, and that applied to 350 km/h double-track high-speed railway tunnel in Grade Ⅴ surrounding rock in China is with low safety factor; the durable bolts are conducive to giving full play to the supporting role of bolt-surrounding rock bearing arch, thus reducing strength of the shotcrete layer and the secondary lining so as to improve the economic efficiency.(4) The total safety factor design method can be used for the precise selection of tunnel cross-section form and support parameters.
引文
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[9] 肖明清. 采用总安全系数法对几个隧道设计问题的探讨[J]. 铁道工程学报, 2019(1): 65.XIAO Mingqing. Discussion on several problems in tunnel design with the total safety factor method[J]. Journal of Railway Engineering Society, 2019(1): 65.
[10] 肖明清, 徐晨. 基于总安全系数法的隧道围岩压力代表值研究[J]. 铁道工程学报, 2019(2): 64.XIAO Mingqing, XU Chen. Study of representative value of tunnel surrounding rock pressure based on total safety factor method[J]. Journal of Railway Engineering Society, 2019(2): 64.
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[13] 中国铁路经济规划研究院有限公司. 时速350公里客运专线双线铁路隧道复合式衬砌: 通隧(2008)0301[Z]. 北京: 中国铁路经济规划研究院有限公司, 2008.China Railway Economic and Planning Research Institute. Composite lining of double track railway tunnel for passenger dedicated line with speed of 350 kilometers per hour: Tongsui(2008)0301[Z]. Beijing: China Railway Economic and Planning Research Institute, 2008.
[14] 罗建春, 高菊如. 既有线铁路隧道病害分级方法与评价体系研究[J]. 现代隧道技术, 2016, 53(6): 12. LUO Jianchun, GAO Juru. A defect classification and evaluation system for existing railway tunnels[J]. Modern Tunnelling Technology, 2016, 53(6): 12.
[15] Barton N. Rock mass classification and tunnel reinforcement selection using the q-system[C]// Symposium on Rock Classification Systems for Engineering Purposes.[S.l.]: [s.n.], 1988.
[2] 蔡美峰, 何满潮, 刘东燕. 岩石力学与工程[M]. 北京: 科学出版社, 2002.CAI Meifeng, HE Manchao, LIU Dongyan. Rock mechanics and engineering[M]. Beijing: Science Press, 2002.
[3] 关宝树. 隧道工程设计要点集[M]. 北京: 人民交通出版社, 2003.GUAN Baoshu. Key points of tunnel design[M]. Beijing: China Communications Press, 2003.
[4] 闫莫明, 徐祯祥, 苏自约. 岩土锚固技术手册[M]. 北京: 人民交通出版社, 2008,.YAN Moming, XU Zhenxiang, SU Ziyue. Geotechnical anchorage technical manual[M]. Beijing: China Communications Press, 2008.
[5] 肖明清. 复合式衬砌隧道的总安全系数设计方法探讨[J]. 铁道工程学报, 2018, 35(1): 84.XIAO Mingqing. Discussion on design method of general safety factor of composite lining tunnel[J]. Journal of Railway Engineering Society, 2018, 35(1): 84.
[6] 肖明清, 王少锋, 陈立保, 等. 基于荷载结构法的隧道初期支护设计方法研究[J]. 铁道工程学报, 2018, 35(4): 60.XIAO Mingqing, WANG Shaofeng, CHEN Libao, et al. Research on the design method of primary support of tunnel based on the load-structure method[J]. Journal of Railway Engineering Society, 2018, 35(4): 60.
[7] 肖明清, 陈立保, 徐晨, 等. 高速铁路隧道支护参数的计算研究[J]. 隧道建设(中英文), 2018, 38(3): 406.XIAO Mingqing, CHEN Libao, XU Chen, et al. Calculation study of support parameters of high-speed railway tunnel[J]. Tunnel Construction, 2018, 38(3): 406.
[8] 肖明清, 徐晨, 王少锋. 我国铁路隧道通用图结构安全性的计算研究[J]. 铁道标准设计, 2019, 63(1): 92.XIAO Mingqing, XU Chen, WANG Shaofeng. Calculation and study of the structure safety of railway tunnel standard drawings in China[J]. Railway Standard Design, 2019, 63(1): 92.
[9] 肖明清. 采用总安全系数法对几个隧道设计问题的探讨[J]. 铁道工程学报, 2019(1): 65.XIAO Mingqing. Discussion on several problems in tunnel design with the total safety factor method[J]. Journal of Railway Engineering Society, 2019(1): 65.
[10] 肖明清, 徐晨. 基于总安全系数法的隧道围岩压力代表值研究[J]. 铁道工程学报, 2019(2): 64.XIAO Mingqing, XU Chen. Study of representative value of tunnel surrounding rock pressure based on total safety factor method[J]. Journal of Railway Engineering Society, 2019(2): 64.
[11] 铁路隧道设计规范: TB 10003—2016[S]. 北京: 中国铁道出版社, 2017.Code for design of railway tunnel: TB 10003-2016[S]. Beijing: China Railway Publishing House, 2017.
[12] 公路隧道设计细则: JTG/T D70—2010[S]. 北京: 人民交通出版社, 2010. Guidelines for design of highway tunnel: JTG/T D70-2010[S]. Beijing: China Communications Press, 2010.
[13] 中国铁路经济规划研究院有限公司. 时速350公里客运专线双线铁路隧道复合式衬砌: 通隧(2008)0301[Z]. 北京: 中国铁路经济规划研究院有限公司, 2008.China Railway Economic and Planning Research Institute. Composite lining of double track railway tunnel for passenger dedicated line with speed of 350 kilometers per hour: Tongsui(2008)0301[Z]. Beijing: China Railway Economic and Planning Research Institute, 2008.
[14] 罗建春, 高菊如. 既有线铁路隧道病害分级方法与评价体系研究[J]. 现代隧道技术, 2016, 53(6): 12. LUO Jianchun, GAO Juru. A defect classification and evaluation system for existing railway tunnels[J]. Modern Tunnelling Technology, 2016, 53(6): 12.
[15] Barton N. Rock mass classification and tunnel reinforcement selection using the q-system[C]// Symposium on Rock Classification Systems for Engineering Purposes.[S.l.]: [s.n.], 1988.