非对称地形条件下高填方盖板涵偏载效应研究
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摘要
采用有限元分析软件Midas/GTS,分析了非对称沟谷宽度及沟谷坡度对涵洞涵周土压力、涵顶填土差异沉降及基底沉降量的影响。研究结果表明:受边坡坡体与填土间摩擦作用影响,沟谷地形非对称会产生明显的偏载效应,即涵顶垂直土压力、涵顶填土沉降量及基底沉降等均呈非对称分布,且随着涵身两侧坡体坡度差及沟谷宽度差的增大而增加;当涵身两侧坡体沟谷宽度相差3倍、坡体坡度差大于45°后偏载效应逐渐趋于稳定;基底两端差异沉降受偏载效应影响比涵顶垂直土压力更为明显,当涵身两侧沟谷宽度相差7.5倍、坡体坡度差为90°时,基底两端沉降量分别相差30.7%和35.5%。因此,由地形条件非对称引起的高填方涵洞偏载效应应引起充分重视。
By using the finite element analysis software Midas/GTS,the influence of asymmetric gully width and gully slope on the earth pressure of culvert culvert,the difference settlement of culvert top filling soil and the settlement of the base is analyzed. The results show that the slope and soil friction effect,the asymmetric valley terrain will produce partial load effect,namely the vertical earth pressure,culvert settlement and settlement are asymmetric distribution,and with the culvert on both sides of the slope and gully slope difference is wide variation law of nonlinear increase degree difference increases,When the width of the gully on both sides of the culvert body is 3 times times and the slope gradient is more than 45 o,the deflection effect tends to stabilize gradually. The difference settlement between the two ends of the substrate is more obvious than the verticalsoil pressure of the culvert roof,when the width of the gully on both sides is 7. 5 times times,the slope is 90 o,the settlement of the base is 30. 7% and 35. 5% respectively. Therefore,due to the asymmetry of terrain conditions,the deflection effect of high fill culvert should be paid attention to.
By using the finite element analysis software Midas/GTS,the influence of asymmetric gully width and gully slope on the earth pressure of culvert culvert,the difference settlement of culvert top filling soil and the settlement of the base is analyzed. The results show that the slope and soil friction effect,the asymmetric valley terrain will produce partial load effect,namely the vertical earth pressure,culvert settlement and settlement are asymmetric distribution,and with the culvert on both sides of the slope and gully slope difference is wide variation law of nonlinear increase degree difference increases,When the width of the gully on both sides of the culvert body is 3 times times and the slope gradient is more than 45 o,the deflection effect tends to stabilize gradually. The difference settlement between the two ends of the substrate is more obvious than the verticalsoil pressure of the culvert roof,when the width of the gully on both sides is 7. 5 times times,the slope is 90 o,the settlement of the base is 30. 7% and 35. 5% respectively. Therefore,due to the asymmetry of terrain conditions,the deflection effect of high fill culvert should be paid attention to.
引文
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[2]公路涵洞设计细则:JTG/T D65-04-2007[S].北京:人民交通出版社,2007.
[3]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,2008,30(12):1771-1777.
[4]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.
[5]Chen Baoguo,Zheng Junjie,Lu Yan’er.Soil-structure interaction of unsymmetrical trench installation culvert[J].Journal of Southeast University(English Edition),2009,25(1):94-98.
[6]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,2007,27(1):35–39.
[7]康佐,杨晓华,谢永利,等.高填路堤下涵洞病害机理[J].长安大学学报(自然科学版),2006,26(2):22-26.
[8]康佐,谢永利,冯忠居,等.应用离心模型试验分析涵洞病害机理[J].岩土工程学报,2006,28(6):784-788.
[9]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.
[10]冯忠居,任文峰,谢富贵,等.公路路基特长箱涵顶进模拟试验[J].交通运输工程学报,2007(4):74-78.
[11]冯忠居,张新占.涵洞土压力与填土沉降差关系分析[J].内蒙古公路与运输,2002(1):21-23