隧道纤维混凝土二衬承载机理及受力计算方法研究
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摘要
充分考虑和发挥纤维混凝土的韧性性能是目前隧道二衬结构设计的热点和难点。通过素混凝土、钢纤维及玄武岩纤维混凝土的室内试验发现:纤维的掺入,对混凝土的增韧效果远超增强效果。基于纤维混凝土优异的韧性特征,将纤维混凝土二衬裂缝视为塑性铰,提出隧道纤维混凝土二衬的承载机理:围压作用下,衬砌出现第一个塑性铰,随着围压继续增大,塑性铰发生转动并引起更多塑性铰出现,至结构由超静定变为可转动机构时,二衬结构破坏。基于此,探讨了隧道纤维混凝土二衬裂后结构受力计算方法,推导了相应的计算公式,并通过模型试验予以验证。研究成果可为纤维混凝土在地下工程中的推广应用提供理论支撑。
Sufficient exploitation of the toughness of fiber reinforced concrete is the hot and difficult topic for the design of tunnel second lining. Based on the laboratory tests on plain concrete, steel fiber reinforced concrete and basalt fiber reinforced concrete, it is found that the addition of fibers has a far better impact on the toughness of concrete than the strength of concrete. In view of the excellent toughness of fiber reinforced concrete, the cracks of secondary lining of fiber reinforced concrete are regarded as plastic hinges, and the bearing mechanism of tunnel secondary lining of fiber reinforced concrete is proposed. Under the confining pressure, the first plastic hinge occurs in the lining, and with the increase of the confining pressure, the plastic hinges may rotate, which further lead to the occurrence of more plastic hinges. When the structure transforms from the statically indeterminate state to a rotating mechanism, the secondary lining structure is damaged. Furthermore, the stress calculation method for the cracked tunnel secondary lining of fiber reinforced concrete is discussed, and then the calculation formula is derived and validated based on model tests. Research results can be referred for popularization and application of fiber reinforced concrete to underground engineering.
Sufficient exploitation of the toughness of fiber reinforced concrete is the hot and difficult topic for the design of tunnel second lining. Based on the laboratory tests on plain concrete, steel fiber reinforced concrete and basalt fiber reinforced concrete, it is found that the addition of fibers has a far better impact on the toughness of concrete than the strength of concrete. In view of the excellent toughness of fiber reinforced concrete, the cracks of secondary lining of fiber reinforced concrete are regarded as plastic hinges, and the bearing mechanism of tunnel secondary lining of fiber reinforced concrete is proposed. Under the confining pressure, the first plastic hinge occurs in the lining, and with the increase of the confining pressure, the plastic hinges may rotate, which further lead to the occurrence of more plastic hinges. When the structure transforms from the statically indeterminate state to a rotating mechanism, the secondary lining structure is damaged. Furthermore, the stress calculation method for the cracked tunnel secondary lining of fiber reinforced concrete is discussed, and then the calculation formula is derived and validated based on model tests. Research results can be referred for popularization and application of fiber reinforced concrete to underground engineering.
引文
[1]RILEM TC 162-TDF Text and design methods for steel fibre reinforced concrete[S].Paris:RILEM,2003
[2]DIN 1045-1 Plain,reinforced and prestressed concrete structures[S].Berlin:DIN,2001
[3]EN 1992-1-1 Eurocode 2:design of concrete structures part 1-1:general rules and rules for buildings[S].Paris:CEN,2004
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[5]松尾庄二,松岡茂,益田彰久,等.SFRCの引張軟化曲線の推定法に関する一研究[J].コンクリート工学年次論文報告集,1995,17(1):457-462
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[15]刘新荣,祝云华,李晓红,等.隧道钢纤维喷射混凝土单层衬砌试验研究[J].岩土力学,2009,30(8):2319-2323(Liu Xinrong,Zhu Yunhua,Li Xiaohong,et al.Experimental research on single-layer tunnel lining of steel fiber shotcrete[J].Rock and Soil Mechanics,2009,30(8):2319-2323(in Chinese))
[16]杜国平,刘新荣,李晓红,等.隧道单层衬砌结构稳定性现场试验及变形控制[J].重庆大学学报,2013,36(12):79-85,91(Du Guoping,Liu Xinrong,Li Xiaohong,et al.Field test and deformation controlling for single tunneling lining stability[J].Journal of Chongqing University,2013,36(12):79-85,91(in Chinese))
[17]景诗庭,朱永全,宋玉香.隧道结构可靠度[M].北京:中国铁道出版社,2002
[18]关宝树.隧道工程设计要点集[M].北京:人民交通出版社,2003
[2]DIN 1045-1 Plain,reinforced and prestressed concrete structures[S].Berlin:DIN,2001
[3]EN 1992-1-1 Eurocode 2:design of concrete structures part 1-1:general rules and rules for buildings[S].Paris:CEN,2004
[4]六郷恵哲,内田裕一,加藤英德,等.鋼繊維補強コンクリートの曲ば破壊性状と引張軟化曲線[J].土木学会論文集,1993,460(18):57-64
[5]松尾庄二,松岡茂,益田彰久,等.SFRCの引張軟化曲線の推定法に関する一研究[J].コンクリート工学年次論文報告集,1995,17(1):457-462
[6]CECS 38-2004纤维混凝土结构技术规程[S].北京:中国计划出版社,2004(CECS 38-2004 Technical specification for fiber reinforced concrete structures[S].Beijing:China Planning Press,2004(in Chinese))
[7]JGJ/T 221-2010纤维混凝土应用技术规程[S].北京:中国建筑工业出版社,2010(JGJ/T 221-2010Technical specification for application of fiber reinforced concrete[S].Beijing:China Architecture&Building Press,2010(in Chinese))
[8]王帅帅,高波,李志业,等.钢筋钢纤维混凝土地下结构构件承载力计算方法研究[J].现代隧道技术,2015,52(5):1-9(Wang Shuaishuai,Gao Bo,Li Zhiye,et al.Calculation methods for the bearing capacity of SFRC underground structure members[J].Modern Tunnelling Technology,2015,52(5):1-9(in Chinese))
[9]高丹盈,史科,赵顺波.钢筋钢纤维高强混凝土梁柱节点承载力计算方法[J].建筑结构学报,2014,35(2):71-79(Gao Danying,Shi Ke,Zhao Shunbo.Calculation method for bearing capacity of steel fiber reinforced high-strength concrete beam-column joints[J].Journal of Building Structures,2014,35(2):71-79(in Chinese))
[10]赵国藩,彭少民,黄承逵,等.钢纤维混凝土结构[M].北京:中国建筑工业出版社,1999
[11]高丹盈,刘建秀.钢纤维混凝土基本理论[M].北京:科学技术文献出版社,1994(Gao Danying,Liu Jianxiu.Basic theory of steel fiber reinforced concrete[M].Beijing:Scientific and Technical Documentation Press,1994(in Chinese))
[12]王志杰.钢纤维混凝土隧道衬砌破坏模式及承载能力研究[J].铁道科学与工程学报,2007,4(6):40-43(Wang Zhijie.Bearing capacity and collapse behavior of steel fiber reinforced concrete tunnel lining[J].Journal of Railway Science and Engineering,2007,4(6):40-43(in Chinese))
[13]郭艳华.钢纤维混凝土增韧性能研究及韧性特征在地下结构计算中的应用[D].成都:西南交通大学,2008(Guo Yanhua.Research on the ductility of the steel fiber reinforced concrete and its application in the underground structure calculation[D].Chengdu:Southwest Jiaotong University,2008(in Chinese))
[14]胡元芳.钢纤维喷混凝土隧道衬砌作用机理的探讨[J].现代隧道技术,2002,39(3):35-38(Hu Yuanfang.Discussion on support behavior of steel fiber reinforced shotcrete lining in tunneling[J].Modern Tunnelling Technology,2002,39(3):35-38(in Chinese))
[15]刘新荣,祝云华,李晓红,等.隧道钢纤维喷射混凝土单层衬砌试验研究[J].岩土力学,2009,30(8):2319-2323(Liu Xinrong,Zhu Yunhua,Li Xiaohong,et al.Experimental research on single-layer tunnel lining of steel fiber shotcrete[J].Rock and Soil Mechanics,2009,30(8):2319-2323(in Chinese))
[16]杜国平,刘新荣,李晓红,等.隧道单层衬砌结构稳定性现场试验及变形控制[J].重庆大学学报,2013,36(12):79-85,91(Du Guoping,Liu Xinrong,Li Xiaohong,et al.Field test and deformation controlling for single tunneling lining stability[J].Journal of Chongqing University,2013,36(12):79-85,91(in Chinese))
[17]景诗庭,朱永全,宋玉香.隧道结构可靠度[M].北京:中国铁道出版社,2002
[18]关宝树.隧道工程设计要点集[M].北京:人民交通出版社,2003