基于最小二乘的深基坑立柱竖向位移预测

Prediction of Vertical Displacement of Column in Deep Foundation Pit Based on Least Square Method

大型工程施工中不可避免会有大量的深基坑工程,为保证深基坑安全顺利施工,需要对基坑进行支护。基坑支护的设计方案很多,对于大型深基坑目前国内多使用内支撑围护结构进行支护,该支护结构包括竖向立柱、内支撑和围护结构三部分,组成一个三维支护体系。在基坑开挖过程中,需要对基坑支护结构进行变形监测,其中基坑立柱竖向位移监测是基坑变形监测的一项重要工作。支撑梁的应力变化和立柱的竖向位移有一定的数学相关性,通过获取支撑梁的应力变化和立柱的竖向位移监测数据,应用最小二乘理论,拟合竖向位移的曲线模型,达到通过监测支撑梁的应力变化来预测立柱竖向位移的目的。

A large number of deep foundation pit projects are inevitable in the construction of large-scale projects.In order to ensure the safety and smooth construction of deep foundation pit,it is necessary to support the foundation pit.There are many design schemes of foundation pit support.At present,internal support structure is widely used in large-scale deep foundation pit in China.The support structure consists of three parts:vertical column,internal support and support structure,forming a three-dimensional support system.In the process of foundation pit excavation,it is necessary to monitor the deformation of foundation pit supporting structure,and the vertical displacement monitoring of foundation pit column is an important work of foundation pit deformation monitoring.There is a certain mathematical correlation between the stress change of the support beam and the vertical displacement of the column.By obtaining the stress change of the support beam and the vertical displacement monitoring data of the column,the least square theory is applied to fit the curve model of the vertical displacement,so as to achieve the purpose of predicting the vertical displacement of the column by monitoring the stress change of the support beam.