铁路盾构隧道单、双层衬砌纵向力学性能的模型试验研究
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摘要
以广深港客运专线狮子洋水下盾构隧道为背景工程,采用轴向等效刚度模型,开展盾构隧道单、双层衬砌纵向力学性能模型试验,并结合数值模拟计算,研究在软硬交替地层且地表有局部附加荷载的复杂情况下,单、双层衬砌隧道纵向沉降与弯矩的变化规律。结果表明:隧道处于软硬交界地层中时,单层衬砌的纵向沉降受地层条件的变化作用明显,较大的沉降量和沉降差均发生在软土侧;双层衬砌可在一定程度上抵御受地层条件的变化作用而产生的不均匀沉降,隧道纵向中心最大沉降量和沉降差均较小;管片衬砌内侧施加连续的混凝土内衬后,隧道所受纵向弯矩成倍增大,最大正弯矩出现在隧道中央偏向软土侧,且混凝土内衬承受绝大部分弯矩;当荷载距隧道轴线3倍洞径以内时,会对隧道的纵向变形及内力产生影响。
Taking Shiziyang underwater shield tunnel of Guangzhou-Shenzhen-Hongkong passenger dedicated line as engineering background,model tests on the longitudinal mechanical properties of single and double layered linings were conducted using equivalent axial stiffness model.Combined with numerical calculations,the variations of longitudinal settlement and bending moment of shield tunnels with single and double layered linings under the junction of hard and soft strata in the conditions that the surface upon the tunnel is partially loaded were studied.Results show that the longitudinal settlement of single-layered lining is significantly influenced by the change of strata when the tunnel is located at the junction of hard and soft strata.Both larger settlement and differential settlement occur on the side of soft strata.Double-layered lining can resist uneven settlement caused by the change of strata to some extent.Both the maximum settlement and differential settlement at the longitudinal center of tunnel are smaller.After concrete lining is continuously applied to the inner side of segment lining,the longitudinal bending moment of tunnel is doubled,and the maximum positive bending moment occurs slightly at the soft strata side of the tunnel center.Most bending moment is borne by concrete lining.When the load is located within three times of tunnel diameter from tunnel axis,the longitudinal deformation and internal force of tunnel will be affected.
Taking Shiziyang underwater shield tunnel of Guangzhou-Shenzhen-Hongkong passenger dedicated line as engineering background,model tests on the longitudinal mechanical properties of single and double layered linings were conducted using equivalent axial stiffness model.Combined with numerical calculations,the variations of longitudinal settlement and bending moment of shield tunnels with single and double layered linings under the junction of hard and soft strata in the conditions that the surface upon the tunnel is partially loaded were studied.Results show that the longitudinal settlement of single-layered lining is significantly influenced by the change of strata when the tunnel is located at the junction of hard and soft strata.Both larger settlement and differential settlement occur on the side of soft strata.Double-layered lining can resist uneven settlement caused by the change of strata to some extent.Both the maximum settlement and differential settlement at the longitudinal center of tunnel are smaller.After concrete lining is continuously applied to the inner side of segment lining,the longitudinal bending moment of tunnel is doubled,and the maximum positive bending moment occurs slightly at the soft strata side of the tunnel center.Most bending moment is borne by concrete lining.When the load is located within three times of tunnel diameter from tunnel axis,the longitudinal deformation and internal force of tunnel will be affected.
引文
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[12]夏才初,李永盛.地下工程测试理论与监测技术[M].上海:同济大学出版社,1999.
[13]何应道.铁路隧道管片衬砌纵向结构力学特征研究[D].成都:西南交通大学,2009.(HE Yingdao.Research on Longitudinal Mechanical Characteristics of Segment Lining of Railway Tunnel[D].Chengdu:Southwest Jiaotong University,2009.in Chinese)
[14]张文杰,徐旭,李向红,等.广义的盾构隧道纵向等效连续化模型研究[J].岩石力学与工程学报,2009,28(增2):3938-3944.(ZHANG Wenjie,XU Xu,LI Xianghong,et al.Research on Generalized Longitudinal Equivalent Continuous Mod-el of Shield Tunnels[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(Supplement 2):3938-3944.in Chinese)
[15]MROUEH H,SHAHROUR I.A Simplified 3DModel for Tunnel Construction Using Tunnel Boring Machines[J].Tunnelling and Underground Space Technology,2008,23(1):38-45.
[2]周宁,袁勇.越江盾构隧道纵向变形曲率与管环渗漏的关系[J].同济大学学报:自然科学版,2009,37(11):1446-1501.(ZHOU Ning,YUAN Yong.Correlation of Cross-River Shield Tunnel between Longitudinal Deformation Curvatureand Segment Leakage[J].Journal of Tongji University:Natural Science,2009,37(11):1446-1501.in Chinese)
[3]丁祖德,彭立敏,陈松洁.盾构隧道基底软硬过渡地段列车振动响应分析[J].郑州大学学报:工学版,2010,31(3):87-91.(DING Zude,PENG Limin,CHEN Songjie.Analysis of Train Vibratory Response of Shield Tunnels in ComplexUneven Soft-Hard Strata Transition Sections[J].Journal of Zhengzhou University:Engineering Science,2010,31(3):87-91.in Chinese)
[4]赵伯明,苏彦.盾构隧道的纵向地震响应[J].中国铁道科学,2009,30(5):59-64.(ZHAO Boming,SU Yan.The Longitudinal Seismic Response of Shield Tunnel[J].China Railway Science,2009,30(5):59-64.in Chinese)
[5]蒋建群,卢慈荣,沈林冲,等.盾构法隧道纵向地震响应特性[J].中国铁道科学,2005,26(6):84-88.(JIANG Jianqun,LU Cirong,SHEN Linchong,el at.Characteristics of the Longitudinal Seismic Response ofShield Tunnel[J].China Railway Science,2005,26(6):84-88.in Chinese)
[6]叶飞,朱合华,丁文其.基于弹性地基梁的盾构隧道纵向上浮分析[J].中国铁道科学,2008,29(4):65-69.(YE Fei,ZHU Hehua,DING Wenqi.Longitudinal Upward Movement Analysis of Shield Tunnel Based on ElasticFoundation Beam[J].China Railway Science,2008,29(4):65-69.in Chinese)
[7]余占奎,黄宏伟,徐凌,等.软土盾构隧道纵向设计综述[J].地下空间与工程学报,2005,1(2):315-318.(YU Zhankui,HUANG Hongwei,XU Ling,el at.Characteristics of the Longitudinal Seismic Response of ShieldTunnel[J].Chinese Journal of Underground Space and Engineering,2005,1(2):315-318.in Chinese)
[8]小泉淳,村上博智,西野健三.ツ—ルドトネルの轴方向特性のモデルイヒにつぃて[C]//土木学会论文集.日本:日本土木学会,1988:79-88.
[9]志波由纪夫,川岛一彦,大日方尚己,等.答变位法にょるツ—ルドトンネルの耐震设计法[J].土木技术资料,1986,28(5):45-50.
[10]林永国,廖少明,刘国彬.地铁隧道纵向变形影响因素的探讨[J].地下空间与工程学报,2000,20(4):264-267.(LIN Yongguo,LIAO Shaoming,LIU Guobin.A Discussion of the Factors Effecting on Longitudinal Deformationof Subway Tunnel[J].Chinese Journal of Underground Space and Engineering,2000,20(4):264-267.in Chi-nese)
[11]洪开荣,杜闯东,王坤.广深港高速铁路狮子洋水下盾构隧道修建技术[J].中国工程科学,2009,11(7):53-58.(HONG Kairong,DU Chuandong,WANG Kun.Shield Tunneling Technology of Shiziyang Subaqueous Tunnel ofGuangzhou-Shenzhen-Hongkong High-Speed Railway[J].Engineering Sciences,2009,11(7):53-58.in Chi-nese)
[12]夏才初,李永盛.地下工程测试理论与监测技术[M].上海:同济大学出版社,1999.
[13]何应道.铁路隧道管片衬砌纵向结构力学特征研究[D].成都:西南交通大学,2009.(HE Yingdao.Research on Longitudinal Mechanical Characteristics of Segment Lining of Railway Tunnel[D].Chengdu:Southwest Jiaotong University,2009.in Chinese)
[14]张文杰,徐旭,李向红,等.广义的盾构隧道纵向等效连续化模型研究[J].岩石力学与工程学报,2009,28(增2):3938-3944.(ZHANG Wenjie,XU Xu,LI Xianghong,et al.Research on Generalized Longitudinal Equivalent Continuous Mod-el of Shield Tunnels[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(Supplement 2):3938-3944.in Chinese)
[15]MROUEH H,SHAHROUR I.A Simplified 3DModel for Tunnel Construction Using Tunnel Boring Machines[J].Tunnelling and Underground Space Technology,2008,23(1):38-45.
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