碎石桩复合地基抗液化性能的数值模拟
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摘要
将饱和砂土视为土-水两相介质,以Biot动力固结方程为基础,编制完全耦合的三维排水有效应力动力反应分析程序,通过模型试验验证程序的正确性。利用该程序对碎石桩复合地基进行地震响应分析,探讨不同土层构成和不同附加压重等因素对抗液化性能的影响。结果表明:经碎石桩加固后,桩间土中的超孔压比比未加固前减小;随时间的延长,出现了明显的超孔压消散现象,距离碎石桩越近,超孔压消散现象越明显;附加压重对地基中超孔隙水压力的增长有明显地抑制作用,在进行工程设计时应该考虑附加压重的有利影响,适当增加桩间距。
Saturated sand is looked as soil-water two-medium,the fully coupled three-dimension effective-stress dynamic analysis procedure is developed on the base of Biot dynamic theory and the right of procedure was proved.Stone columns composite foundation is analyzed by the developed procedure,the influence of different soil layer and different additive pressure on anti-liquefaction characteristic of composite foundation is discussed.The research shows that the excess pore water press ratio in the soil around column is smaller than that of reinforcement before.With decreasing of input earthquake acceleration,the dissipation of excess pore water press is remarkable,the distance from stone columns is smaller,and the dissipation is more remarkable.Additive pressure can restrain the incensement of excess pore water pressure,this favourable factor should be considered in engineering design and the space of stone columns may be increscent.
Saturated sand is looked as soil-water two-medium,the fully coupled three-dimension effective-stress dynamic analysis procedure is developed on the base of Biot dynamic theory and the right of procedure was proved.Stone columns composite foundation is analyzed by the developed procedure,the influence of different soil layer and different additive pressure on anti-liquefaction characteristic of composite foundation is discussed.The research shows that the excess pore water press ratio in the soil around column is smaller than that of reinforcement before.With decreasing of input earthquake acceleration,the dissipation of excess pore water press is remarkable,the distance from stone columns is smaller,and the dissipation is more remarkable.Additive pressure can restrain the incensement of excess pore water pressure,this favourable factor should be considered in engineering design and the space of stone columns may be increscent.
引文
1 Finn W D L,Byrne P M,Martin G R.Seismic Response andLiquefaction of Sands.Journal of the Geotechnical EngineeringDivision,ASCE,1976,102(8):841-856
2 Seed H B,Martin P P,Lysmer J.Pore-Water Pressure Changes DuringSoil Liquefaction.Journal of the Geotechnical Engineering Division,ASCE,1976,102(4):323-346
3徐志英,周建.奥洛维尔土坝三维排水有效应力动力分析.水利学报,1991,(6):19-34
4盛虞,卢盛松,姜朴.土工建筑物动力固解的耦合振动分析.水利学报,1989,(12):31-42
5张建民.饱和砂土瞬态动力学理论及其实用研究:[博士学位论文].西安:陕西机械学院,1991
6黄明聪.复合地基振动反应与地震响应数值分析:[博士学位论文].杭州:浙江大学,1999
7林本海,谢定义.复合地基的液化检验理论及其应用.北京:中国水利水电出版社,1999
8 Ming Haiyan.Fully-Coupled Earthquake Response Analysis of EarthDams Using a Critical State Sand Model:[Ph.D.Thesis].HongKong:Hong Kong University of Science and Technology,2001
9 Zienkiewicz O C,Leunf K H,Hinton E,et al.Earth Dam Analysis forEarthquake:Numerical Solution and Constitutive Relations for Non-Linear(Damage)Analysis//Proc.Int.Conf.on Dams and Earthquake.London:1981,179-194
10 Zienkiewicz O C,Pastor M,Chan A H C,et al.ComputationalApproaches to the Dynamics and Static of Saturated and UnsaturatedSoils//Advanced Geotechnical Analysis.Banerjee P K,Butterfield R,Eds.London and New York:Elssevier Applied Science,1991:1-46
11 Lacy S J,Prevost J H.Nonlinear Seismic Response Analysis of EarthDams.Soil Dyn.Earthquake Engng,1987,6(1):48-67
12刘汉龙,井合进,一井康二.大型沉箱式码头岸壁地震反应分析.岩土工程学报,1998,20(2):26-30
13邵生俊,小(口)介,福井卓雄.堤坝砂土地基液化的数值模拟.西安理工大学学报,2001,17(4):138-142
14杨军,宋二祥,等.饱和土动力分析的无条件稳定交叉迭代法.清华大学学报,2001,41(6):28-34
15 Zienkiewicz O C,Chang C T,Bettess P.Drained,Undrained,Consolidating and Dynamic Behaviour Assumpations in Soils;Limits ofValidity.Getoechnique,1980,30:385-395
16 Akiyoshi T,Fuchida K,Fang H L.Absorbing Boundary Conditions forDynamic Analysis of Fluid-Saturated Porous Media.Soil Dynamics andEarthquake Engineering,1994,13:387-397
17张艳美.碎石桩复合地基抗液化性能数值模拟及应用研究:[博士学位论文].北京:北京交通大学,2006
18黄春霞.碎石桩复合地基抗液化性能试验研究:[博士学位论文].北京:北京交通大学,2005
2 Seed H B,Martin P P,Lysmer J.Pore-Water Pressure Changes DuringSoil Liquefaction.Journal of the Geotechnical Engineering Division,ASCE,1976,102(4):323-346
3徐志英,周建.奥洛维尔土坝三维排水有效应力动力分析.水利学报,1991,(6):19-34
4盛虞,卢盛松,姜朴.土工建筑物动力固解的耦合振动分析.水利学报,1989,(12):31-42
5张建民.饱和砂土瞬态动力学理论及其实用研究:[博士学位论文].西安:陕西机械学院,1991
6黄明聪.复合地基振动反应与地震响应数值分析:[博士学位论文].杭州:浙江大学,1999
7林本海,谢定义.复合地基的液化检验理论及其应用.北京:中国水利水电出版社,1999
8 Ming Haiyan.Fully-Coupled Earthquake Response Analysis of EarthDams Using a Critical State Sand Model:[Ph.D.Thesis].HongKong:Hong Kong University of Science and Technology,2001
9 Zienkiewicz O C,Leunf K H,Hinton E,et al.Earth Dam Analysis forEarthquake:Numerical Solution and Constitutive Relations for Non-Linear(Damage)Analysis//Proc.Int.Conf.on Dams and Earthquake.London:1981,179-194
10 Zienkiewicz O C,Pastor M,Chan A H C,et al.ComputationalApproaches to the Dynamics and Static of Saturated and UnsaturatedSoils//Advanced Geotechnical Analysis.Banerjee P K,Butterfield R,Eds.London and New York:Elssevier Applied Science,1991:1-46
11 Lacy S J,Prevost J H.Nonlinear Seismic Response Analysis of EarthDams.Soil Dyn.Earthquake Engng,1987,6(1):48-67
12刘汉龙,井合进,一井康二.大型沉箱式码头岸壁地震反应分析.岩土工程学报,1998,20(2):26-30
13邵生俊,小(口)介,福井卓雄.堤坝砂土地基液化的数值模拟.西安理工大学学报,2001,17(4):138-142
14杨军,宋二祥,等.饱和土动力分析的无条件稳定交叉迭代法.清华大学学报,2001,41(6):28-34
15 Zienkiewicz O C,Chang C T,Bettess P.Drained,Undrained,Consolidating and Dynamic Behaviour Assumpations in Soils;Limits ofValidity.Getoechnique,1980,30:385-395
16 Akiyoshi T,Fuchida K,Fang H L.Absorbing Boundary Conditions forDynamic Analysis of Fluid-Saturated Porous Media.Soil Dynamics andEarthquake Engineering,1994,13:387-397
17张艳美.碎石桩复合地基抗液化性能数值模拟及应用研究:[博士学位论文].北京:北京交通大学,2006
18黄春霞.碎石桩复合地基抗液化性能试验研究:[博士学位论文].北京:北京交通大学,2005
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