地震荷载作用下饱和砂土的p—y关系
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摘要
利用给土层施加反压的方法控制饱和砂土中的超孔隙水压力,以此模拟受地震荷载作用饱和砂土具有残余孔压时的状态,进而对具有不同状态饱和砂土与桩的相互作用进行模型试验,研究p—y关系随饱和砂土中残余孔压的变化规律。结果表明,可以按照具有残余孔压饱和砂土的强度确定其极限抗力以及土层反力模量系数,进而确定受震动荷载作用的饱和砂土p—y关系。
The excess pore water pressure in saturated sands was controlled by applying the back pressure to the stratum,which was used to simulate the saturated sand with the residual pore water pressure under seismic loads.Model tests of the soil-pile interaction were conducted to research variations of p-y curves of saturated sands with different states with an increase of the residual pore water pressure.Research results showed that the ultimate lateral resistance and the subgrade reaction modulus coefficient can be determined based on strength parameters of saturated sand with residual pore water pressures.p-y curves of saturated sands were further determined under seismic loads.
The excess pore water pressure in saturated sands was controlled by applying the back pressure to the stratum,which was used to simulate the saturated sand with the residual pore water pressure under seismic loads.Model tests of the soil-pile interaction were conducted to research variations of p-y curves of saturated sands with different states with an increase of the residual pore water pressure.Research results showed that the ultimate lateral resistance and the subgrade reaction modulus coefficient can be determined based on strength parameters of saturated sand with residual pore water pressures.p-y curves of saturated sands were further determined under seismic loads.
引文
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[2]American Petroleum Institute.Recommended practice forplanning,designing,and constructing fixed offshore plat-forms-working stress design[S].Washington:RP 2A-WSD,2000.
[3]Liu L,Dobry R.Effect of liquefaction on lateral response ofpiles by centrifuge model tests[J].National Center for Earth-quake Engineering Research Bulletin,1995,9(1):7-11.
[4]Abdoun T.Modeling of seismically induced lateral sprea-ding of multi-layered soils and its effects on pile foundations[D].New York:Rensselaer Polytechnic Institute,1997.
[5]Wilson D W,Boulanger R W,Kutter B L.Seismic lateralresistance of liquefying sand[J].Journal of Geotechnicaland Geoenvironmental Engineering,ASCE,2000,126(10):898-906.
[6]王建华,冯士伦.液化土层中桩基水平承载特性分析[J].岩土力学,2005,26(10):1 597-1 601.
[7]Ashour M,Norris G.Modeling lateral soil-pile response onsoil-pile interaction[J].Journal of Geotechnical and Geoen-vironmental Engineering,ASCE,2000,129(5):404-414.
[8]王建华,戚春香,余正春,等.弱化饱和砂土中桩的p-y曲线与极限抗力研究[J].岩土工程学报,2008,30(3):309-315.
[9]王建华,戚春香.按强度参数确定弱化土层水平极限抗力的探讨[J].天津大学学报,2008,41(4):454-460.
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