Adjustment of particle accelerator tunnel control network based on partial parameter constraints
To control the error accumulation problem and improve the accuracy of the adjustment of tunnel control network,this study designed three constraint schemes.Firstly,considering the non-parallelism between the plumb-lines of the station,the angle of the plumb-line between the station and the storage ring center was calculated based on the control network.This constraint condition was taken into account during adjustment,making the adjustment model more rigorous.Secondly,in order to improve the plane accuracy of the tunnel control network,a total station was used to measure the long side angle of the control points that were far away,and the angle constraint was added in the adjustment process.Thirdly,the first-order levelling measurement was carried out for tunnel ground points.Based on the results of levelling,the control network was transformed to the horizontal plane by using the least square transformation method to further improve the vertical accuracy of the control network.Finally,a simulation experiment was conducted on a tunnel control network with a circumference of 1 360 m.The results indicate that considering the difference of the plumb-line between stations and benchmark leveling or elevation difference and adjustment value can improve the vertical accuracy of the control network.Adding the constraints of the angle of the long side can improve the plane accuracy of the control network.Simultaneously considering the angle of the plumb-line between stations,long side angle observation values,and benchmark leveling or elevation difference and adjustment value can improve the accuracy of control point positions,verifying the effectiveness of constraint conditions.The research results can provide a reference for the deployment of control networks in related engineering projects.
free stationingtunnel control networkerror accumulationadjustment of three-dimensional control network
万方数据
维普
