基坑监测数据缺失的动态数学模型-参数插值恢复方法

Dynamic Mathematical Model-parameter Interpolation Recovery Method for Monitoring Data Missing of Foundation Pits

本文提出了一种恢复因短暂监测中断而缺失的基坑侧壁变形数据的方法,称之为动态数学模型-参数插值法。基坑侧壁变形受多种因素影响,但支护结构类型和约束情况是主要因素,因此,本文主要研究侧壁无约束和顶部有约束两种情况下的深层水平位移随深度变化规律,提出了分别采用对数型和正态分布型动态曲线模型,并对模型参数进行拟合插值,最终求解获得缺失数据期的监测数据。与常用的平均法恢复数据对比后发现,测斜孔上部2/3深度部位的深层水平位移,动态数学模型-参数插值法计算结果更接近实际监测值,但测斜孔下部1/3深度部位的深层水平位移,平均法计算结果更接近实际监测值。

In the paper,a method of restoring missing foundation pit side wall deformation data due to short monitoring interruption is proposed. It is called dynamic mathematical model-parameter interpolation method. The foundation pit side wall deformation is affected by many factors. However,supporting structure type and constraint condition are the main factors. Therefore,the deep horizontal displacement change law with depth under the two conditions of no constraint on the side wall and constraint at the top is mainly studied in the paper. It is proposed that logarithmic and normal distribution dynamic curve models are adopted respectively for fitting interpolation on model parameters. Finally,the monitoring data during the data missing period is solved and obtained. The method is compared with the average method through data recovery. It is discovered that the deep horizontal displacement in the deep part 1/3 above the inclined hole is measured.The calculation result of the dynamic mathematical model-parameter interpolation method is closer to the measured value.However—when the deep horizontal displacement in the deep part 1/3 above the inclined hole is measured. The calculation result of the average method is closer to the measured value.