改进的平均间隙法在地铁结构变形监测网稳定性分析中的应用

Application of Improved Average Gap Method in Stability Analysis of Subway Structure Deformation Monitoring Network

结合南京某地铁监测实例,提出了一种改进的平均间隙法,其基本思想是:首先利用附有条件的间接平差法对多期平面控制网观测数据进行联合平差,得到各期的坐标平差值,然后利用数学上的组合法将平差后的数据进行排列组合计算出单位权方差的F统计量,判断出有变动点的周期,最后找出变动点。结果表明该方法可以准确判断出有变动点的周期以及变动的点。

Combining with the monitoring instance of a subway in Nanjing, an improved average gap method is proposed here. Its basic idea is that the joint adjustment for the observational data of multi-phase plane control network is carried out by the conditional indirect adjustment method to get the coordinate adjustment value of each period. Then, the per- mutation and combination for the data after the adjustment are carried out to calculate the F statistic of unit weight vari- ance and analyze the change point period. Finally, the change point is found out. The results show that this method carl accm＇ately determine the change point in the cycle and the change in the point.