| 列车振动荷载下路基-地基应力应变分析 |
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| 作者单位： | ;1.中铁第五勘察设计院集团有限公司 |
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| 摘 要： | 应力应变是路基-地基系统动态响应的重要指标,也是评价路基与地基行车安全及舒适度的重要依据,因此进一步研究其意义重大。以Biot理论为基础,用数值模拟的方法,分别用线弹性本构模型及弹塑性本构模型(Pastor-Zienkiewicz Mark Model III)分别描述弹性与弹塑性砂土的动力特性,以Mat Lab以及FSSI-CAS 2D等软件为工具,进一步研究富含地下水环境下的弹性、弹塑性砂土路基-地基系统在列车通过时的应力应变特征。通过计算得到路基-地基系统内部应力应变的具体值及其变化规律,为解决类似问题提供一个新的方法,并可应用于实践。
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| 关 键 词： | 应力应变 振动荷载 数值模拟 弹性 弹塑性 |
Stress and Strain Analysis of Subgrade-foundation under Train Vibrating Load |
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| Affiliation: | ,China Railway Fifth Survey and Design Institute Group Co.,Ltd. |
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| Abstract: | Stress and strain are the important factors reflecting the dynamic response of subgrade-foundation system and evaluating train running safety and ride comfort. Based on Biot theory and numerical simulation,this paper employs the linear elasticity model and elastic-plastic soil constitutive model( Pastor-Zienkiewicz Mark Model Ⅲ) to orderly simulate dynamic performance of elastic and elastic-plastic sand,and uses Mat Lab and FSSI-CAS 2D software to further analyze the dynamic response of elastic and elastic-plastic water sand foundation under train vibrating load. As a result,the specific numerical values and change laws of the subgrade-foundation are obtained via calculation,which may serve as a new and practical solution. |
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| Keywords: | Stress and strain Vibration load Numerical simulation Elasticity Elastoplasticity |
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