EPS板减载对宽坦式高填黄土明洞衬砌结构内力和厚度的影响分析
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摘要
为改善宽坦式高填黄土明洞衬砌结构内力,减少衬砌厚度,采用数值模拟方法,研究有无EPS板减载时高填黄土明洞不同位置处衬砌结构内力和厚度随回填土高度的变化规律。结果表明:无EPS板减载时,明洞衬砌结构内力随回填土高度的增加呈线性增长,拱顶至拱肩衬砌厚度呈非线性增长,其余位置呈线性增长;有EPS板减载时,明洞衬砌结构内力和厚度随回填土高度变化规律均与荷载作用下EPS板的应力—应变曲线有关,当EPS板处于塑性阶段时,内力与厚度变化率最大,减载效果最佳,当EPS板进入硬化阶段后,减载效果开始逐渐减弱;明洞的宽高比越大,衬砌结构内力和厚度越大,内力减载量也越大,减载效果越明显。建议针对不同回填土高度、宽高比的宽坦式高填黄土明洞,进行EPS板密度和厚度的优化设计。
In order to improve the internal force of lining structure and reduce the lining thickness of high fill loess open cut tunnel in wide and flat area,the variations of the internal force and thickness of the lining structure along with backfill height at different positions of the high fill loess open cut tunnel with and without the load reduction of EPS board were studied by numerical simulation method.Results show that,without the load reduction of EPS board,the internal force of lining structure increases linearly with the increase of backfill height,and the thickness of the lining structure from the vault to the spandrel of the arch increases nonlinearly,while those at the rest positions increase linearly.With the load reduction of EPS board,the variations of both the internal force and thickness of open cut tunnel lining structure with backfill height are related to the stress-strain curve of EPS board under load.When the EPS board is in plastic stage,the change rate of internal force and thickness is the maximum,and the load reduction effect is the best.When the EPS board is in hardening stage,the load reduction effect begins to weaken gradually.The greater the ratio of width to height of open cut tunnel,the greater the internal force and thickness of lining structure,the greater the load reduction of internal force,and the more obvious the load reduction effect.It is suggested to optimize the density and thickness of EPS board for high fill loess open cut tunnel in wide and flat area with different backfill heights and ratios of width to height.
In order to improve the internal force of lining structure and reduce the lining thickness of high fill loess open cut tunnel in wide and flat area,the variations of the internal force and thickness of the lining structure along with backfill height at different positions of the high fill loess open cut tunnel with and without the load reduction of EPS board were studied by numerical simulation method.Results show that,without the load reduction of EPS board,the internal force of lining structure increases linearly with the increase of backfill height,and the thickness of the lining structure from the vault to the spandrel of the arch increases nonlinearly,while those at the rest positions increase linearly.With the load reduction of EPS board,the variations of both the internal force and thickness of open cut tunnel lining structure with backfill height are related to the stress-strain curve of EPS board under load.When the EPS board is in plastic stage,the change rate of internal force and thickness is the maximum,and the load reduction effect is the best.When the EPS board is in hardening stage,the load reduction effect begins to weaken gradually.The greater the ratio of width to height of open cut tunnel,the greater the internal force and thickness of lining structure,the greater the load reduction of internal force,and the more obvious the load reduction effect.It is suggested to optimize the density and thickness of EPS board for high fill loess open cut tunnel in wide and flat area with different backfill heights and ratios of width to height.
引文
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[15]国家铁路局.TB10003—2016铁路隧道设计规范[S].北京:中国铁道出版社,2017.(National Railway Administration of the Peoples Republic of China.TB10003—2016Code for Design of Railway Tunnel[S].Beijing:China Railway Publishing House,2017.in Chinese)
[2] KARINSKI Y S,DANCYGIER A N,LEVIATHAN I.An Analytical Model to Evaluate the Static Soil Pressure on a Buried Structure[J].Engineering Structure,2003,25(1):91-101.
[3] BENNETT R M, WOOD S M,DRUMM E C,et al.Vertical Loads on Concrete Box Culverts under High Embankments[J].Journal of Bridge Engineering,2005,10(6):643-649.
[4] KIM K,CHAI H Y.Design Loading on Deeply Buried Box Culverts[J].Journal of Geotechnical and Geoenvironmental Engineering,2005,131(1):20-27.
[5]李祝龙,孙秀凯,胡滨,等.高填方路基钢波纹管涵洞分层土压力分析[J].中外公路,2014,34(1):40-44.
[6]刘刚.高填方路堤下钢波纹管涵洞受力与变形特性研究[D].西安:长安大学,2012.(LIU Gang.Study on the Stress and Deformation Characteristics of the Steel Corrugated Pipe Culvert under High Embankment[D].Xian:Changan University,2012.in Chinese)
[7]廖鑫.高填土大跨径钢波纹管涵的力学性能与设计方法研究[D].长沙:湖南大学,2014.(LIAO Xin.Study on Mechanical Property and Design Method of High-Backfill and Long-Span Corrugated Steel Pipes[D].Changsha:Hunan University,2014.in Chinese)
[8] SUN L,HOPKINS T,BECKHAM T.Stress Reduction by Ultra-Lightweight Geofoam for High Fill Culvert:Numerical Analysis[C]//Proceedings of the 13th Great Lakes Geotechnical and Geoenvironmental Conference.Milwaukee:American Society of Civil Engineers,2005:146-154.
[9] SUN L,HOPKINS T C,BECKHAM T.Load Reduction by Geofoam for Culvert Extension:Numerical Analysis[C]//GeoCongress 2006.Atlanta:Geotechnical Engineering in the Information Technology Age,2006:1-5.
[10] KANG J,PARKER F,YOO C H.Soil-Structure Interaction and Imperfect Trench Installations for Deeply Buried Concrete Pipes[J].Journal of Geotechnical and Geoenvironmental Engineering,2007,133(3):277-285.
[11]王晓谋,顾安全.上埋式管道垂直土压力的减荷措施[J].岩土工程学报,1990,12(3):83-89.
[12]顾安全,吕镇锋,姜峰林,等.高填土盖板涵EPS板减荷试验及设计方法[J].岩土工程学报,2009,31(10):1481-1486.(GU Anquan,LZhenfeng,JIANG Fenglin,et al.Load Reduction Tests and Design Methods for Culverts with High Fill Soil Using EPS Slabs[J].Chinese Journal of Geotechnical Engineering,2009,31(10):1481-1486.in Chinese)
[13]王明年,徐湉源,于丽,等.考虑基础刚度的新型高填方双层衬砌式明洞的动态力学特性[J].中国铁道科学,2017,38(1):68-76.(WANG Mingnian,XU Tianyuan,YU Li,et al.Dynamic Mechanical Property of New Type of High Fill Open Cut Tunnel with Bi-Layer Lining Considering Foundation Stiffness[J].China Railway Science,2017,38(1):68-76.in Chinese)
[14]李盛,王起才,马莉,等.黄土地区高填土明洞土拱效应及土压力减载计算[J].岩石力学与工程学报,2014,33(5):1055-1062.(LI Sheng,WANG Qicai,MA Li,et al.Earth Pressure and Soil Arch Effect for High Fill Open Cut Tunnel in Loess Area under Different Load Reduction Schemes[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(5):1055-1062.in Chinese)
[15]国家铁路局.TB10003—2016铁路隧道设计规范[S].北京:中国铁道出版社,2017.(National Railway Administration of the Peoples Republic of China.TB10003—2016Code for Design of Railway Tunnel[S].Beijing:China Railway Publishing House,2017.in Chinese)