三点法（也称固结度对数配合法）对于高铁桥梁沉降数据趋势预测，具有稳定性好，回归相关系数高，预测误差小，对异常数据敏感等突出特点。但是三点法受起始点选取，数据平滑质量，时间间隔选取等因素影响而准确程度较差。论文引入序列二次规划法、高阶拟合模型和修正双曲线等3种方法对三点法进行改进，并通过实验数据对改进结果进行了对比分析，验证了改进方法的有效性。该方法在同类桥梁沉降预测中具有一定的工程应用价值。%Three-point-method ( also called consolidation logarithmic fitting method ) for the high-speed railway Bridges’ settlement prediction has a lot outstanding characteristics ,such as good stability,high correlation coefficient, small prediction error , sensitive to abnormal data .But the three point method is a starting point , the quality of data smoothing ,the choice of time interval and other factors and the degree of accuracy is poor .The sequences of two quadrat-ic programming method ,high order fitting model and the modified hyperbolic three methods such as the three point meth-od was improved ,and the improved results were compared and analyzed by means of experimental data .The method has certain engineering application value prediction for similar bridges in the subsidence .
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