碎石桩处理软土路基变形影响因素分析
|
摘要
采用有限元软件建立碎石桩处理软土路基计算模型,深入研究不同碎石桩埋深、碎石桩间距、地基弹性模量及路堤填方高度对路堤变形的影响,并针对路堤位移和应力变化规律进行探讨,分析结果表明:适宜的增大碎石桩埋深可以有效减小路堤变形;增大碎石桩间距会导致路堤较大的应力和位移变形;增大地基弹性模量可以有效降低路堤最大竖直位移,但路堤水平位移和应力会有所增大;增大路提填方高度会导致路堤发生较大的位移变形和应力变形;研究结果可为碎石桩处理软基工程提供理论参考。
In this paper,the calculation model of soft soil subgrade treated by gravel pile is established by using finite element software,and the influence of different gravel pile burying depth,gravel pile spacing,elastic modulus of foundation and embankment height on embankment deformation is deeply studied. The variation of displacement and stress of embankment is discussed. The results show that the deformation of embankment can be effectively reduced by increasing the buried depth of gravel pile. Increasing the distance between gravel piles will lead to large displacement and certain stress deformation of embankment, increasing the elastic modulus of foundation can effectively reduce the maximum vertical displacement of embankment, but the horizontal displacement and stress of embankment will increase. Increasing the height of road-lift fill will lead to the occurrence of embankment Large displacement deformation and stress deformation,the research results can provide reference for related projects.
In this paper,the calculation model of soft soil subgrade treated by gravel pile is established by using finite element software,and the influence of different gravel pile burying depth,gravel pile spacing,elastic modulus of foundation and embankment height on embankment deformation is deeply studied. The variation of displacement and stress of embankment is discussed. The results show that the deformation of embankment can be effectively reduced by increasing the buried depth of gravel pile. Increasing the distance between gravel piles will lead to large displacement and certain stress deformation of embankment, increasing the elastic modulus of foundation can effectively reduce the maximum vertical displacement of embankment, but the horizontal displacement and stress of embankment will increase. Increasing the height of road-lift fill will lead to the occurrence of embankment Large displacement deformation and stress deformation,the research results can provide reference for related projects.
引文
[1]姜兆华,文华.复杂地层中大功率振冲碎石桩施工参数分析[J].施工技术,2016,45(13):64-66.
[2]毕佳蕾,沈振中,旦增赤列.振冲碎石桩复合地基的等效渗透系数计算方法[J].水电能源科学,2017,35(11):87-90.
[3]杨涛,李超.刚性基础下组合渗流碎石桩-不排水桩复合地基固结分析[J].岩石力学与工程学报,2018,37(11):2631-2640.
[4]袁玉卿,刘文利,张得嵩.碎石桩控制粉砂土拼接路基沉降的数值模拟[J].公路,2017,62(10):57-61.
[5]王蕴嘉,孔郁斐,宋二祥.碎石桩加固带硬壳红黏土地基变形特性的数值分析[J].工业建筑,2016,46(08):109-114.
[6]欧阳芳,张建经,韩建伟,等.包裹碎石桩和碎石桩复合地基抗震性能对比试验研究[J].岩土力学,2016,37(04):998-1004+1012.
[7]Gao Wen-xue,Liu Hong-yang,Xiao Peng-fei,et al..Application research on using geogrid in semi-filling and semi-excavating roadbed engineering[C].Electric Technology and Civil Engineering(ICETCE),2011 International Conference on,2011.
[8]Y.Jafarian,B.Mehrzad,C.J.Lee,et al.Centrifuge modeling of seismic foundation-soil-foundation interaction on liquefiable sand[J].Soil Dynamics and Earthquake Engineering,2017,97:184-204.
[9]李歆.筋箍碎石桩复合地基桩土应力比及沉降计算[J].公路工程,2016,41(6):209-213.
[10]刘江波,李俊.软土路基病害机理及Boltzmann沉降模型应用研究[J].公路工程,2016,41(3):203-207.
[2]毕佳蕾,沈振中,旦增赤列.振冲碎石桩复合地基的等效渗透系数计算方法[J].水电能源科学,2017,35(11):87-90.
[3]杨涛,李超.刚性基础下组合渗流碎石桩-不排水桩复合地基固结分析[J].岩石力学与工程学报,2018,37(11):2631-2640.
[4]袁玉卿,刘文利,张得嵩.碎石桩控制粉砂土拼接路基沉降的数值模拟[J].公路,2017,62(10):57-61.
[5]王蕴嘉,孔郁斐,宋二祥.碎石桩加固带硬壳红黏土地基变形特性的数值分析[J].工业建筑,2016,46(08):109-114.
[6]欧阳芳,张建经,韩建伟,等.包裹碎石桩和碎石桩复合地基抗震性能对比试验研究[J].岩土力学,2016,37(04):998-1004+1012.
[7]Gao Wen-xue,Liu Hong-yang,Xiao Peng-fei,et al..Application research on using geogrid in semi-filling and semi-excavating roadbed engineering[C].Electric Technology and Civil Engineering(ICETCE),2011 International Conference on,2011.
[8]Y.Jafarian,B.Mehrzad,C.J.Lee,et al.Centrifuge modeling of seismic foundation-soil-foundation interaction on liquefiable sand[J].Soil Dynamics and Earthquake Engineering,2017,97:184-204.
[9]李歆.筋箍碎石桩复合地基桩土应力比及沉降计算[J].公路工程,2016,41(6):209-213.
[10]刘江波,李俊.软土路基病害机理及Boltzmann沉降模型应用研究[J].公路工程,2016,41(3):203-207.