邻近斜坡地基地震承载力计算新方法
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摘要
研究了地震荷载作用下邻近斜坡时条形基础地基动承载力的计算方法.通过假定靠斜坡边地基潜在的滑动面为由直线、对数螺线和直线组合而成的复合滑动面,基于统一强度理论,利用拟静力和极限平衡的分析方法,得到了考虑中间主应力影响的该类型斜坡地基地震承载力的计算方法.算例计算结果表明,考虑中间主应力时该类斜坡地基静、动承载力比不考虑时要大,可分别提高17%~45%和22%~49%.同时,探讨了各计算参数对该类斜坡地基静、动承载力的影响.
A new calculation method for!the seismic bearing capacity of shallow strip footings close to slope was proposed,which assumed that a composite failure surface was composed of planar,log-spiral and planar.Based on the unified strength theory,by using the pseudostatic approach and the method of limit equilibrium,the expressions of the seismic bearing capacity that took the effect of intermediate stress into account were obtained.The results of the given calculation example show that the static or seismic bearing capacity that takes the effect of intermediate stress into account is bigger than the one without considering the effect of intermediate stress,and the values of static and seismic bearing capacity increase by 17%～45% and 22%～49% respectively.In the end,the influence of computation parameters on the results was discussed.
A new calculation method for!the seismic bearing capacity of shallow strip footings close to slope was proposed,which assumed that a composite failure surface was composed of planar,log-spiral and planar.Based on the unified strength theory,by using the pseudostatic approach and the method of limit equilibrium,the expressions of the seismic bearing capacity that took the effect of intermediate stress into account were obtained.The results of the given calculation example show that the static or seismic bearing capacity that takes the effect of intermediate stress into account is bigger than the one without considering the effect of intermediate stress,and the values of static and seismic bearing capacity increase by 17%～45% and 22%～49% respectively.In the end,the influence of computation parameters on the results was discussed.
引文
[1]RICHARDS R,ELMS D G,BUDHU M.Seismic bearing capaci-ty and settlement of foundations[J].Geotech Eng ASCE,1993,119(4):662-674.
[2]DORMIEUX L,PECKER A.Seismic bearing capacity of founda-tions on cohesionless soil[J].Geotech Eng ASCE,1995,121(3):300-303.
[3]SOUBRA A H.Upper bound solutions for bearing capacity offoundations[J].Geotech Geoenviron Eng ASCE,1999,125(1):59-69.
[4]唐谚哲.基于统一强度理论斜坡地基动承载力研究[D].长沙:湖南大学土木工程学院,2007.TANG Y Z.A study on seismic bearing capacity of sloping groundbased on unified strength theory[D].Changsha:College of CivilEngineering of Hunan University,2007.(In Chinese)
[5]俞茂宏.岩土类材料的统一强度理论及其应用[J].岩土工程学报,1994,16(2):1-10.YU M H.Unified strength theory and it’s application of geotech-nical material[J].Chinese Journal of Geotechnical Engineering,1994,16(2):1-10.(In Chinese)
[6]范文.基于统一强度理论的地基极限承载力公式[J].岩土力学,2005,26(10):1617-1622.FAN W.Formula of ultimate bearing capacity of shallow founda-tion based on unified strength theory[J].Rock and Soil Mechan-ics,2005,26(10):1617-1622.(In Chinese)
[7]俞茂宏,廖红建,张永强.本构模型从单剪到三剪到双剪到统一[J].岩石力学与工程学报,1998,17(增):739-743.YU M H,LIAO H J,ZHANG Y Q.From single-shear to tri-shear to twin to unification[J].Chinese Journal of Rock Mechan-ics and Engineering,1998,17(supplement):739-743.(In Chi-nese)
[8]DEEPANKAR C,KANAKAPURA S S,SUBBA RAO.Seismicbearing capacity of shallow strip footings[J].Geotechnical andGeological Engineering,2005,23:403-418.
[2]DORMIEUX L,PECKER A.Seismic bearing capacity of founda-tions on cohesionless soil[J].Geotech Eng ASCE,1995,121(3):300-303.
[3]SOUBRA A H.Upper bound solutions for bearing capacity offoundations[J].Geotech Geoenviron Eng ASCE,1999,125(1):59-69.
[4]唐谚哲.基于统一强度理论斜坡地基动承载力研究[D].长沙:湖南大学土木工程学院,2007.TANG Y Z.A study on seismic bearing capacity of sloping groundbased on unified strength theory[D].Changsha:College of CivilEngineering of Hunan University,2007.(In Chinese)
[5]俞茂宏.岩土类材料的统一强度理论及其应用[J].岩土工程学报,1994,16(2):1-10.YU M H.Unified strength theory and it’s application of geotech-nical material[J].Chinese Journal of Geotechnical Engineering,1994,16(2):1-10.(In Chinese)
[6]范文.基于统一强度理论的地基极限承载力公式[J].岩土力学,2005,26(10):1617-1622.FAN W.Formula of ultimate bearing capacity of shallow founda-tion based on unified strength theory[J].Rock and Soil Mechan-ics,2005,26(10):1617-1622.(In Chinese)
[7]俞茂宏,廖红建,张永强.本构模型从单剪到三剪到双剪到统一[J].岩石力学与工程学报,1998,17(增):739-743.YU M H,LIAO H J,ZHANG Y Q.From single-shear to tri-shear to twin to unification[J].Chinese Journal of Rock Mechan-ics and Engineering,1998,17(supplement):739-743.(In Chi-nese)
[8]DEEPANKAR C,KANAKAPURA S S,SUBBA RAO.Seismicbearing capacity of shallow strip footings[J].Geotechnical andGeological Engineering,2005,23:403-418.
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