高速铁路桩网结构低矮路堤动力失效机理研究

项目名称： 高速铁路桩网结构低矮路堤动力失效机理研究

项目编号： No.51308547

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 建筑科学

项目作者： 蔡德钩

作者单位： 中国铁道科学研究院

项目金额： 25万元

中文摘要： 桩网结构是高速铁路普遍采用的一种地基处理方法，能够较好的控制高速铁路路基工后沉降，但对动荷载循环作用下桩网结构低矮路堤的失效机理研究较少，国外相关规范仅对动荷载作粗略地规定，国内尚无相应的设计规范，导致工程应用的盲目和保守，及运营期间加筋网垫层的潜在破坏，以及养护维修缺乏指导。本项目拟采用数值分析和缩比动态模型试验研究桩网结构中路基土拱的动力特性，采用单元结构模型试验研究动荷载循环作用下加筋网垫层的变形特性与破坏机理，采用整体模型试验和数值模拟方法研究动荷载作用下桩网结构体系相互作用和荷载传递规律,建立桩网结构低矮路堤动荷载循环作用下的失效模式。研究成果将深化对动荷载作用下桩网结构荷载传递规律及失效机理的系统认识，发展和完善桩网结构设计理论，为指导桩网结构工程实践和养护维修提供技术和理论支持，提升我国地基沉降变形控制理论和水平。

中文关键词： 桩网结构；低矮路堤；动荷载；失效机理；

英文摘要： The gosynthetics reinforced and pile supported embankment (GRPSE) is a common way of ground treatment. It can control the post-construction settlement of high speed railway effectively. But now there is less research on the dynamic load transfer law and failure mechanism of GRPSE. There is only roughly rule in foreign regulation and no relative regulation in the domestic standard. This led to blind and conservation during the construction and even may cause the rein-forced cushion failure. This project studies the dynamic characteristics of soil arching of GRPSE by using the way of shrink ratio model experiment and numerical simulation, and studies the deformation and failure mechanism of rein-forced cushion under dynamic load by the way of unit structure model test. The research also studies the interactions and load transfer law of low embankment for GRPSE under dynamic load by integral model test and numerical analysis. The research results will deepen realization of load transfer law and failure mechanism under the dynamic load, develop the design theory of the GRPSE, provide the theory and technology support for engineering practice and maintenance, and promote the theory level of the control of subgrade settlement.

英文关键词： Geosynthetics Reinforced Pile Supported Embankment；Low Embankment；Dynamic Load；Failure Mechanism；