沟槽式深覆土减载明洞衬砌结构受力特性及截面设计研究
|
摘要
为了改善沟槽式高填黄土明洞衬砌结构内力,减小明洞衬砌厚度,文章通过数值模拟方法,从EPS板材料的力学性能和减载机制分析入手,研究了减载前后明洞各位置结构内力和结构衬砌厚度变化规律,以及边坡坡角对减载前后明洞结构内力和截面衬砌厚度的影响规律。结果表明,高填黄土明洞结构内力和结构衬砌厚度均随回填土高度的增加而增加;减载明洞结构内力和结构衬砌厚度减小效果均与EPS板厚度和EPS板材料的应力-应变曲线有关,在EPS板处于塑性阶段末期,减载效果最佳,并给出了该密度下EPS板减载的优化设计;边坡角度越大,减载前后明洞结构内力越小;除拱顶外,明洞衬砌截面厚度均有减小趋势;而减载后的洞顶衬砌厚度减小效果最明显,其余截面厚度减小量均呈加速减小趋势。文章最后建议对不同填土高度、不同边坡坡角的沟槽式高填明洞进行不同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-filled trench type open-cut tunnel in loess,it studies the variation law of internal forces and lining thickness of structure as well as the effect law of slope angle on internal force of open-cut tunnel and lining thickness before and after load reduction from the perspectives of mechanical behaviors and load reduction mechanism of EPS board by numerical simulation method.The result shows that the internal force and lining thickness of high-filled open-cut structure in loess increase with an increase of filling height;reduction effects of internal force and lining thickness of open-cut tunnel under load reduction are related to EPS board thickness and stress-strain curve,the load reduction effect is the best when EPS board is at the end of plastic stage,and an optimized design for load reduction of EPS board under this density was presented;the greater the slope angle,the smaller the structural internal force of open-cut tunnel before and after load reduction;the lining thickness of open-cut tunnel tends to decrease except the vault;thickness reduction effect of the lining at tunnel roof is most obvious after load reduction while the thickness reduction of other sections decreases in an accelerate way.It is suggested that designs for different EPS board density and thickness should be optimized regarding different filling heights and slope angles of trench type high-filled open-cut tunnels.
In order to improve the internal force of lining structure and reduce the lining thickness of high-filled trench type open-cut tunnel in loess,it studies the variation law of internal forces and lining thickness of structure as well as the effect law of slope angle on internal force of open-cut tunnel and lining thickness before and after load reduction from the perspectives of mechanical behaviors and load reduction mechanism of EPS board by numerical simulation method.The result shows that the internal force and lining thickness of high-filled open-cut structure in loess increase with an increase of filling height;reduction effects of internal force and lining thickness of open-cut tunnel under load reduction are related to EPS board thickness and stress-strain curve,the load reduction effect is the best when EPS board is at the end of plastic stage,and an optimized design for load reduction of EPS board under this density was presented;the greater the slope angle,the smaller the structural internal force of open-cut tunnel before and after load reduction;the lining thickness of open-cut tunnel tends to decrease except the vault;thickness reduction effect of the lining at tunnel roof is most obvious after load reduction while the thickness reduction of other sections decreases in an accelerate way.It is suggested that designs for different EPS board density and thickness should be optimized regarding different filling heights and slope angles of trench type high-filled open-cut tunnels.
引文
[1]范鹤,刘斌,范泽,等.高填土涵洞相似材料模型试验与数值模拟[J].吉林大学学报(工学版),2008,38(2):399-403.FAN He,LIU Bin,FAN Ze,et al.Model Test with Similar Material and Numerical Simulation of Culvert with High Fills[J].Journal of Jilin University(Engineering and Technology Edition),2008,38(2):399-403.
[2]RICHARD BENNETT,SCOTT M.WOOD,ERIC C DRUMM,et al.Vertical Loads on Concrete Box Culverts under High Embankments[J].Journal of Bridge Engineering,2005,10(6):643-649.
[3]KYUNGSIK KIM,CHAI H YOO.Design Loading on Deeply Buried Box Culverts[J].Journal of Geotechnical and Geoenvironmental Engineering,2005,131(1):20-27.
[4]LIECHENG SUN,TOMMY HOPKINS,TONY BECKHAM.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.
[5]L SUN,T C HOPKINS,T BECKHAM.Load Reduction by Geofoam for Culvert Extension:Numerical Analysis[C]//GeoCongress2006.Atlanta:Geotechnical Engineering in the Information Technology Age,2006.
[6]JUNSUK KANG,FRAZIER PARKER,CHAI H YOO.Soil-Structure Interaction and Imperfect Trench Installations for Deeply Buried Concrete Pipes[J].Journal of Geotechnical and Geoenvironmental Engineering,2007,133(3):277-285.
[7]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,LV Zhenfeng,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.
[8]谭永杰,匡亮.大跨超厚回填土明洞衬砌结构选型及设计优化研究[J].高速铁路技术,2017,8(3):32-36+62.TAN Yongjie,KUANG Liang.Study on Lining Structure Selection and Design Optimization for Large-span Super High Fill Open Cut Tunnels[J].High Speed Railway Technology,2017,8(3):32-36+62.
[9]杨雄,华科,琚国全,等.超大跨度超高回填荷载明洞衬砌结构选型探讨[J].高速铁路技术,2013,4(3):62-67.YANG Xiong,HUA Ke,JU Guoquan,et al.Research on Selection of Structure Patterns for Open-cut Tunnel with Super Large-span and Ultra High Backfill Load[J].High Speed Railway Technology,2013,4(3):62-67.
[10]匡亮,陈赤坤,谭永杰,等.沟谷山区城市超厚填土铁路明洞设计[J].铁道工程学报,2013,30(12):51-56.KUANG Liang,CHEN Chikun,TAN Yongjie,et al.Design of Extra-high Filling Urban Railway Open Cut Tunnel in Valley Mountain Area[J].Journal of Railway Engineering Society,2013,30(12):51-56.
[11]徐湉源,王明年,于丽.超高填方明洞采用双层衬砌型式的可行性研究[J].铁道标准设计,2017,61(3):108-112.XU Tianyuan,WANG Mingnian,YU Li.Research on Feasibility of Bi-Layer Lining Adopted in the Design of High-Fill Open Cut Tunnel[J].Railway Standard Design,2017,61(3):108-112.
[12]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 BiLayer Lining Considering Foundation Stiffness[J].China Railway Science,2017,38(1):68-76.
[13]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.
[14]李盛,马莉,王起才,等.高填黄土明洞卸载结构土压力模型试验和数值模拟分析[J].岩土工程学报,2016,38(4):636-642.LI Sheng,MA Li,WANG Qicai,et al.Model Tests and Numerical Simulations of Earth Pressure for Unloading Structures of High Fill Open Cut Tunnel[J].Chinese Journal of Geotechnical Engineering,2016,38(4):636-642.
[2]RICHARD BENNETT,SCOTT M.WOOD,ERIC C DRUMM,et al.Vertical Loads on Concrete Box Culverts under High Embankments[J].Journal of Bridge Engineering,2005,10(6):643-649.
[3]KYUNGSIK KIM,CHAI H YOO.Design Loading on Deeply Buried Box Culverts[J].Journal of Geotechnical and Geoenvironmental Engineering,2005,131(1):20-27.
[4]LIECHENG SUN,TOMMY HOPKINS,TONY BECKHAM.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.
[5]L SUN,T C HOPKINS,T BECKHAM.Load Reduction by Geofoam for Culvert Extension:Numerical Analysis[C]//GeoCongress2006.Atlanta:Geotechnical Engineering in the Information Technology Age,2006.
[6]JUNSUK KANG,FRAZIER PARKER,CHAI H YOO.Soil-Structure Interaction and Imperfect Trench Installations for Deeply Buried Concrete Pipes[J].Journal of Geotechnical and Geoenvironmental Engineering,2007,133(3):277-285.
[7]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,LV Zhenfeng,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.
[8]谭永杰,匡亮.大跨超厚回填土明洞衬砌结构选型及设计优化研究[J].高速铁路技术,2017,8(3):32-36+62.TAN Yongjie,KUANG Liang.Study on Lining Structure Selection and Design Optimization for Large-span Super High Fill Open Cut Tunnels[J].High Speed Railway Technology,2017,8(3):32-36+62.
[9]杨雄,华科,琚国全,等.超大跨度超高回填荷载明洞衬砌结构选型探讨[J].高速铁路技术,2013,4(3):62-67.YANG Xiong,HUA Ke,JU Guoquan,et al.Research on Selection of Structure Patterns for Open-cut Tunnel with Super Large-span and Ultra High Backfill Load[J].High Speed Railway Technology,2013,4(3):62-67.
[10]匡亮,陈赤坤,谭永杰,等.沟谷山区城市超厚填土铁路明洞设计[J].铁道工程学报,2013,30(12):51-56.KUANG Liang,CHEN Chikun,TAN Yongjie,et al.Design of Extra-high Filling Urban Railway Open Cut Tunnel in Valley Mountain Area[J].Journal of Railway Engineering Society,2013,30(12):51-56.
[11]徐湉源,王明年,于丽.超高填方明洞采用双层衬砌型式的可行性研究[J].铁道标准设计,2017,61(3):108-112.XU Tianyuan,WANG Mingnian,YU Li.Research on Feasibility of Bi-Layer Lining Adopted in the Design of High-Fill Open Cut Tunnel[J].Railway Standard Design,2017,61(3):108-112.
[12]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 BiLayer Lining Considering Foundation Stiffness[J].China Railway Science,2017,38(1):68-76.
[13]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.
[14]李盛,马莉,王起才,等.高填黄土明洞卸载结构土压力模型试验和数值模拟分析[J].岩土工程学报,2016,38(4):636-642.LI Sheng,MA Li,WANG Qicai,et al.Model Tests and Numerical Simulations of Earth Pressure for Unloading Structures of High Fill Open Cut Tunnel[J].Chinese Journal of Geotechnical Engineering,2016,38(4):636-642.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |