【摘要】 为了合理分析可液化场地桥梁桩基侧向承载力进行了改进m值法的研究。基于振动台试验和m值法,建立了桩-土相互作用体系有限元分析模型;引入反映可液化砂层侧向承载力衰减状态的孔压比指标值Ru;将不同时刻对应墩顶配重惯性力作为体系外部激励施加于墩顶;通过不断试算液化过程中砂土的m值,保证桩的弯矩计算值与试验值吻合较好。建立了考虑孔压比效应的砂土m值衰减因子p与Ru之间关系式。最后,推荐给出可液化场地桥梁桩基侧向承载性能分析的改进m值法。更多还原

【Abstract】 A modified m-value method is studied,in order to reasonably analyze the lateral bearing capacity of bridge pile foundation in liquefiable ground.The FE analytical model of pile-soil interaction system is established based on shaking table test and the m-value method.The pore pressure ratio indicator is introduced to reflect the attenuation state of the lateral bearing capacity of liquefiable sand;and the inertial force,from the counter weights on the pier at different times,on the top of the pile as the external excitation is directly applied to pile-soil interaction system.The calculated pile bending moments are insured to be in good agreement with the recorded results through trying m-values of sand continualling during liquefaction.The relational expression between the attenuation factor p of m-value and the indicator is established.Finally,the modified m-value method is brought out and recommended to analyze the lateral bearing capacity of bridge pile foundation in liquefiable ground.更多还原