胡中波;马建林;苏春晖;周俊;

• 1:西南交通大学土木工程学院

摘要(Abstract)：

科学、合理地预测桥梁桩基工后沉降量是高速铁路建设的关键环节。鉴于京沪高速铁路桥梁桩基沉降曲线在多级荷载作用下呈明显阶梯形基本特征,而常规沉降预测模型不能反映全过程的沉降与时间的关系,引入荷载系数的概念,建立了变形过程指数模型,介绍了模型的求解过程及参数的确定方法。并结合沉降实测资料,运用指数曲线模型和Logistic模型进行对比分析。结果表明,变形过程指数模型能将架梁前期的观测数据纳入分析时间段内,其预测精度高,误差小,预测结果与实测数据基本吻合。进一步对模型参数的计算值进行粗差分析及归类,给出了不同地基土层、不同荷载作用下参数β的建议值。

关键词(KeyWords)： 安全工程;沉降预测;变形过程指数模型;高速铁路;桥梁桩基

Abstract:

Keywords:

基金项目(Foundation): 铁道部京沪高速铁路科技重大专项(2008G31-B)

作者(Authors): 胡中波;马建林;苏春晖;周俊;

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