高速铁路桥梁桩基工后沉降机理与预估方法研究

项目名称： 高速铁路桥梁桩基工后沉降机理与预估方法研究

项目编号： No.51208518

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 建筑环境与结构工程学科

项目作者： 杨奇

作者单位： 中南大学

项目金额： 24万元

中文摘要： 桥梁桩基工后沉降控制是高速铁路设计和施工最为关键的技术之一，特别是在软土地区，这一问题更为突出,然而目前相关资料积累不多，计算理论还不成熟，研究远滞后于工程实践的需要。桥梁桩基工后沉降研究的关键问题包括桩基工后沉降产生的机理和预估计算方法。本项目拟应用现场测试、室内试验、理论分析和数值计算相结合的方法，对高速铁路桥梁桩基长期(工后)沉降变形演化规律、长期高速列车荷载对桩基工后沉降的影响规律和程度、恒载作用下桩端（间）土固结蠕变和桩基混凝土徐变对工后沉降影响规律和程度等问题进行系统深入研究，建立高速铁路桥梁桩基工后沉降预估计算方法，并在此基础揭示工后沉降产生机理。研究成果可为高速铁路桥梁桩基的设计和工后沉降计算提供理论依据，为评估桥梁桩基工后沉降、确定满足桥梁桩基工后沉降限值的合理辅轨时间提供方法和手段，为规范、指南的修订、完善提供重要科学依据。具有重要的理论意义和工程应用价值。

中文关键词： 高速铁路；桩基；工后沉降；流变固结；列车荷载

英文摘要： The settlement after acceptance control of pile foundation, especially in the soft ground, is a key technology in design and construction of high-speed railway. But the corresponding researches are far lagging behind the needs of engineering practice for lacking technology data and immature computation theory. The key problems include the mechanism and calculation methods of pile foundation. The methods of field tests, laboratory experiments, theoretical analysis and numeric calculation will be adopted systematically in this research to study on long-term evolution settlement law, the influence law and extent of the settlement after acceptance due to long-term high-speed train load，the influence law and extent of the settlement after acceptance for the creep and consolidation of soil and the creep of pile foundation concrete subjected to dead load. the calculation methods for the settlement after acceptance of pile foundation will be established. Based on it， the mechanism of the settlement after acceptance will be revealed . These achievements can provide the basis for the pile foundation design and calculation methods for the settlement after acceptance. The methods and means for evaluating the settlement after acceptance and ascertaining the reasonable time for laying tracks will be provided. The significant

英文关键词： high-speed railway；pile foundation；post-construction settlement；rheological consolidation；train loads