支点法分析桩锚体系及基于监测的参数反演

Analysis of Pile-anchor System With Fulcrum Method and Parameter Backcalculation Based on Monitorint

以变形作为控制条件的基坑支护结构设计是一个十分复杂的工程问题,由于支点法具有计算模式明确、过程简单的优点,受到广大工程设计人员的欢迎。但是,支点法中土抗力系数m的选取是工程界的一大难题,在支点法计算中m值选取的准确性直接影响支护结构位移和内力的汁算结果,所以将支点法建模及反分析方法应用于实际工程,在开挖过程中考虑了支撑变形的非线性,开发了FORTRAN程序对支护结构进行了反演计算。通过反演分析m值并预测支护结构的变形,实现支护动态设计信息化施工。结果表明,位移反分析法进行深基坑工程中的参数反演与位移预测取得比较好的效果,说明该方法在深基坑开挖反演、预测方面是合理可行的。

Deformation as a control condition for supporting structure design in foundation pit is a very complex engineering problem, but fulcrum method is accepted by lots of engineers for its clear computing model and simple procedure. In fulcrum method calculation, the accuracy of the m-value effects the displacement and internal force results of supporting structure directly, so, this paper put the fulcrum method modeling inversion analysis used in actual project, in excavation process consides supporting deformation nonlinear. It develops FORTRAN program executing inversion calculating for supporting structure, getting m-value through inversion analysis and forecasting the deformation of supporting structure, realizing dynamic design and information construction. The results show that deformation inversion analysis obtains good results during parameter inversion and displacement prediction of deep foundation pit engineering, proving that the method is reasonable on inversion analysis and prediction during deep foundation pit excavation.