列车运行时会产生激烈的振动荷载,会使铁路地基与路基发生振动。铁路地基过大的振动反应将会给列车运行带来安全隐患,降低乘车舒适性,同时也会给周边环境带来不良影响,因此进一步研究和认识铁路地基与路基的动力特性意义重大。文章以Bio...列车运行时会产生激烈的振动荷载,会使铁路地基与路基发生振动。铁路地基过大的振动反应将会给列车运行带来安全隐患,降低乘车舒适性,同时也会给周边环境带来不良影响,因此进一步研究和认识铁路地基与路基的动力特性意义重大。文章以Biot固结理论为基础,采用数值模拟的方法,用弹塑性土本构模型(Pastor-Zienkiewicz Mark Model III)描述弹塑性砂土的动力行为;以有限元软件FSSI-CAS 2D与Mat Lab为工具进一步研究富含地下水环境下的弹塑性砂土路基-地基系统在列车通过时所产生的动力特性。根据计算结果得到了地基内部加速度、速度及位移的变化规律。展开更多
Finite and infinite coupled element method was used to analyze the strength and deformation in layered soil foundation which was under the rectangular shallow footing subjected to vertical loads. In the numerical anal...Finite and infinite coupled element method was used to analyze the strength and deformation in layered soil foundation which was under the rectangular shallow footing subjected to vertical loads. In the numerical analysis, the footing was assumed to be elastic; the soil was assumed to be elastoplastic and the Drucker-Prager constitutive model was applied to describe its mechanic behavior. Corresponding program was employed to compute six kinds of layered soil foundations constituted by different soil layers. The conclusions which are useful in the theory and practice were made according to the analysis of the computation results.展开更多
文摘列车运行时会产生激烈的振动荷载,会使铁路地基与路基发生振动。铁路地基过大的振动反应将会给列车运行带来安全隐患,降低乘车舒适性,同时也会给周边环境带来不良影响,因此进一步研究和认识铁路地基与路基的动力特性意义重大。文章以Biot固结理论为基础,采用数值模拟的方法,用弹塑性土本构模型(Pastor-Zienkiewicz Mark Model III)描述弹塑性砂土的动力行为;以有限元软件FSSI-CAS 2D与Mat Lab为工具进一步研究富含地下水环境下的弹塑性砂土路基-地基系统在列车通过时所产生的动力特性。根据计算结果得到了地基内部加速度、速度及位移的变化规律。
基金Funded by Communication Construction Scientific Research Programme of the Western Region of China from the Communications Ministry of China (No.2002-318-000-26)
文摘Finite and infinite coupled element method was used to analyze the strength and deformation in layered soil foundation which was under the rectangular shallow footing subjected to vertical loads. In the numerical analysis, the footing was assumed to be elastic; the soil was assumed to be elastoplastic and the Drucker-Prager constitutive model was applied to describe its mechanic behavior. Corresponding program was employed to compute six kinds of layered soil foundations constituted by different soil layers. The conclusions which are useful in the theory and practice were made according to the analysis of the computation results.
