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建筑地基沉降预测的Usher-Spillman组合模型研究

Keywords: 数学模型,沉降,地基,实测资料

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Abstract:

从40处现场地基沉降实测资料中选取有代表性的17处资料,对建筑地基沉降-时间曲线进行了优化的拟合分析.针对建筑地基的沉降特性,提出了Usher-Spillman组合数学模型.对17处实测资料的拟合表明,Usher-Spillman组合模型对台阶型、L型、S型、凹型、微凹型、直线型曲线都有高的拟合精度,相关系数R为0.99768~1,平均为0.99924;该模型拟合效果比双曲线模型、Usher曲线模型、Spillman曲线模型的都要好;基于该组合数学模型的建筑地基沉降的计算值与实测值的误差一般为±0.96918%.结果表明,本文提出的Usher-Spillman组合数学模型适应性强,它对建筑地基沉降-时间曲线的拟合是较为可靠的,利用这些拟合方程式能对建筑地基沉降进行预测.

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