反复荷载作用下软土地基长期沉降机理研究

项目名称： 反复荷载作用下软土地基长期沉降机理研究

项目编号： No.U1304526

项目类型： 联合基金项目

立项/批准年度： 2014

项目学科： 建筑科学

项目作者： 师旭超

作者单位： 河南工业大学

项目金额： 30万元

中文摘要： 近年来，随着粮食物流建设的迅猛发展，对筒仓、油罐等地基变形的控制要求越来越高。同时在集装箱码头、堆场等地也存在长期反复荷载的作用。由于软土固结理论落后于工程实践的发展，使得长期低频反复荷载引起的软土地基累积沉降问题日益突出。本项目将依托中国粮食流通建设项目重点工程，拟以郑州等地软土为研究对象，考虑其所受荷载的特殊性，从土体固结释水角度出发，综合运用室内土工试验、理论分析、数值模拟以及现场监测等技术手段，探究软土释水固结与反复变形等宏观行为下的微观机理与内在联系，揭示长期低频反复荷载作用下饱和软土地基的固结流变特性与变形规律，建立理论分析模型，并提出一套能够较为真实地反映长期低频反复荷载下饱和软土地基沉降的计算方法。通过本项目的实施，不仅可以完善该类软土地基的设计理论，实现土力学的发展，而且对于河南乃至我国粮食物流设施建设及其运营安全具有十分重要的工程指导意义。

中文关键词： 软土地基；反复荷载；固结变形；长期沉降；试验研究

英文摘要： In recent years, with the development of grain logistics construction, civil engineers often encounter cyclic deformation of soft clay due to the application of repeated loading. The demands for deformation control of soft clay foundation about the silos and oil tanks are becoming higher and higher. At the same time the foundation of container terminal and yard also often subject to long-term repeated loading. Because the consolidation theory of soft clay is drop behind the engineering practice, the accumulation settlement and deformation of soft clay foundation caused by the long-term repeated loading has become a very outstanding question. The researcher would study the settlement mechanism of soft clay of zhengzhou and other places under long term repeated loading relying on the key projects of China's grain circulation construction. In term of the specialty of the repeated loading, the technique route of this research includes several kinds of method or means, general analytic method and numerical method or test and field monitoring to solve deformation mechanism problems of soft clay. The chief content of this research mainly includes development of low frequency repeated loading system, constitutive model analysis about the primary consolidation and secondary consolidation deformation of soft clay soil

英文关键词： soft clay foundation；repeated loading；consolidation deformation；long term settlement；experiment research