基坑冠梁水平位移监测数据的增补分析方法研究

Research on Supplementary Analysis Method of Horizontal Displacement Monitoring Data for Foundation Pit Crown Beam

基坑冠梁水平位移是基坑支护结构稳定性判定的关键参数之一,但目前的监测手段主要对冠梁局部特征点进行变形监测,可能错过实际变形最大区段。结合某工程实例,给出了一种利用支撑轴力监测数据增补水平位移监测数据的计算方法;同时,提出了一种利用已知数据推算冠梁全段水平位移变化的有限元建模分析方法。实例计算表明:本文方法推算的最大水平位移值偏于安全,可用于辅助判断基坑冠梁稳定性;模型推算的水平位移分布曲线与利用Spline函数插值得到的水平位移分布曲线具有较高相似度,在不具备建模条件时,可用Spline插值函数结合文章给出的监测数据增补方法进行分析。

The horizontal displacement of the foundation pit crown beam is one of the key parameters for judging the stability of the foundation pit supporting structure.However,the current monitoring methods mainly monitor the deformation of the local characteristic points of the crown beam,and may miss the maximum deformation section.Based on a project example,a calculation method for supplementing horizontal displacement monitoring data with supporting axial force monitoring data is presented.At the same time,a finite element modeling analytical method is used to estimate the horizontal displacement of the crown beam using the known data.The example calculations show that the maximum horizontal displacement value estimated by the method in this paper is more secure and can be used to help judge the stability of the foundation pit crown beam.The horizontal displacement distribution curve calculated by the model has a high similarity with the curve obtained by interpolation with Spline function.When the modeling conditions are not available,the Spline interpolation function can be used in combination with the monitoring data supplement method given in this paper for analysis.