弹塑性含水砂性地基-路基系统动力特性分析  

Dynamic Characteristics Analysis of Elastic-plastic Watering Sandy Foundation-subgrade System

作　　者：常世清 Chang Shiqing(China Railway Fifth Survey and Design Institute Group Co. Ltd. , Beijing 102600, China)

机构地区：[1]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《铁道建筑技术》2016年第12期67-72,77,共7页Railway Construction Technology

摘　　要：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。Drastic oscillating load is generated when a train is running on railway and it causes vibration of railway sub- grade and foundation. The excessive vibration of railway foundation would produce security risk of running train, negative impact on surrounding environment also makes passengers feel uncomfortable. Therefore, it is significant to further under- stand and study dynamic response to railway foundation and snbgrade. Based on the Blot＇ s theory and numerical modeling method, this paper selected elastic-plastic soil constitutive model （Pastor-Zienkiewicz Mark Model III） to simulate dynamic performance of elastic-plastic sand, adopted the softwares of FSSI-CAS-2D and Mat Lab to further research the dynamic re- sponse of elastic-plastic water sand foundation system under train vibrating load. According to the computational results, the changing rule for acceleration, velocity and displacement of interior railway foundation was obtained clearly.

关 键 词：振动荷载 数值模拟 弹塑性地基 铁路地基 动力特性 

分 类 号：U213.1[交通运输工程—道路与铁道工程]