山区高填方盖板涵涵顶应力集中影响因素研究
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摘要
高填方涵洞受力机理复杂,现行规范未能综合考虑山区中众多因素对涵顶垂直土压力的影响,致使高填方涵洞易出现不同程度的病害。为探明山区中多种因素对高填方盖板涵涵顶应力集中的影响,基于前期调研和数值仿真分析,研究了填土高度、结构尺寸、填土模量、地基土模量及地形条件对盖板涵涵顶垂直土压力集中系数Ks及涵顶内外差异沉降δ的影响,在此基础上提出相应的工程技术建议。研究结果表明:Ks与涵身跨径、涵顶侧填土模量、地基土模量及沟坡坡度呈负相关,与涵底地基土模量、沟坡宽度呈正相关,与填土高度的关系呈先增大后减小最终趋于稳定的变化趋势;Ks与δ关系密切,但并非呈简单的线性关系。根据研究结果,提出了利用现场地形条件及改进施工工艺减轻高填方涵洞涵顶应力集中现象的工程建议。
The mechanism of high fill culverts is complicated,and the current codes fail to take account of the influence of many factors on the vertical earth pressure of culverts,which results in different degrees of defects of high fill culverts.In order to find out the factors affecting the stress concentration on the top of slab culvert in mountainous area,based on investigations and numerical simulations and analysis,studies are carried out in terms of the impact of embankment height,structure size,soil modulus,soil modulus and topography on vertical earth pressure on the top of culvert concentration coefficient Ksand inner and outer of the culvert differential settlementδ.On the basis of the corresponding engineering technical advice is put forward.The results show that the Ksis negatively related to the top of the culvert span,side fill modulus,earth foundation modulus and gully slope,and is positively correlated with the culvert bottom soil modulus and the gully width,and increases first,then decreases and finally tends to be stable against the filling height;Ksandδare closely related,but not be in a simple linear relationship;and the recommendation that using terrain conditions and improving the construction process to reduce the high embankment culvert stress concentration is proposed.
The mechanism of high fill culverts is complicated,and the current codes fail to take account of the influence of many factors on the vertical earth pressure of culverts,which results in different degrees of defects of high fill culverts.In order to find out the factors affecting the stress concentration on the top of slab culvert in mountainous area,based on investigations and numerical simulations and analysis,studies are carried out in terms of the impact of embankment height,structure size,soil modulus,soil modulus and topography on vertical earth pressure on the top of culvert concentration coefficient Ksand inner and outer of the culvert differential settlementδ.On the basis of the corresponding engineering technical advice is put forward.The results show that the Ksis negatively related to the top of the culvert span,side fill modulus,earth foundation modulus and gully slope,and is positively correlated with the culvert bottom soil modulus and the gully width,and increases first,then decreases and finally tends to be stable against the filling height;Ksandδare closely related,but not be in a simple linear relationship;and the recommendation that using terrain conditions and improving the construction process to reduce the high embankment culvert stress concentration is proposed.
引文
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[6]郑俊杰,陈保国,张世飙.沟埋式涵洞非线性土压力试验研究与数值模拟[J].岩土工程学报,2008,(12):1771-1777.
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[8]陈保国,骆瑞萍,孙金山.上埋式盖板涵受力特性及影响因素研究[J].岩土力学,2011,(1):199-206.
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[10]李永刚,李珠,张善元.矩形沟埋涵洞顶部垂直土压力[J].工程力学,2008,(1):155-160.
[11]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.
[12]Kim K,Yoo C H.Design loading on deeply buried box culverts[J].Journal of Geotechnical and Geoenvironmental Engineering,2005,131(1):20-27.
[13]冯忠居.大型沟埋式蛋型管道土压力的非线性有限元分析[J].西安公路交通大学学报,1996,(4):23-27.
[14]冯忠居,顾安全.大型沟埋式管道侧向土压力的研究[J].西安公路交通大学学报,1995,(1):27-30.
[15]冯忠居,乌延玲,贾彦武,等.钢波纹管涵洞受力与变形特性模拟试验研究[J].岩土工程学报,2013,35(1):187-192.
[2]JTG/T D65-04-2007公路涵洞设计细则[S].北京:人民交通出版社,2007.
[3]顾安全.上埋式管道及洞室垂直土压力的研究[J].岩土工程学报,1981,(1):3-15.
[4]张卫兵,刘保健.西部山区高填路堤涵洞病害及其防治对策[J].中外公路,2007,(1):35-39.
[5]折学森,顾安全.沟谷地形中埋设管道的土压力研究[J].长安大学学报:自然科学版,1989,(4):33-39.
[6]郑俊杰,陈保国,张世飙.沟埋式涵洞非线性土压力试验研究与数值模拟[J].岩土工程学报,2008,(12):1771-1777.
[7]郑俊杰,赵建斌,陈保国.高路堤下涵洞垂直土压力研究[J].岩土工程学报,2009,(7):1009-1013.
[8]陈保国,骆瑞萍,孙金山.上埋式盖板涵受力特性及影响因素研究[J].岩土力学,2011,(1):199-206.
[9]李永刚,张善元.矩形沟埋涵洞顶部垂直土压力试验和理论研究[J].岩土力学,2008,(4):1081-1086.
[10]李永刚,李珠,张善元.矩形沟埋涵洞顶部垂直土压力[J].工程力学,2008,(1):155-160.
[11]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.
[12]Kim K,Yoo C H.Design loading on deeply buried box culverts[J].Journal of Geotechnical and Geoenvironmental Engineering,2005,131(1):20-27.
[13]冯忠居.大型沟埋式蛋型管道土压力的非线性有限元分析[J].西安公路交通大学学报,1996,(4):23-27.
[14]冯忠居,顾安全.大型沟埋式管道侧向土压力的研究[J].西安公路交通大学学报,1995,(1):27-30.
[15]冯忠居,乌延玲,贾彦武,等.钢波纹管涵洞受力与变形特性模拟试验研究[J].岩土工程学报,2013,35(1):187-192.