时速400 km高铁CPⅢ网形优化及其精度仿真计算分析

CPⅢNetwork Optimization and Accuracy Simulation Analysis of 400 km/h High-speed Railway

目前,正在建设的成渝中线高铁预留有时速400 km的条件,为研究具有自主知识产权且能够满足更高速度高铁轨道平顺性测控精度要求的CPⅢ平面网优化网形,提出4种优化CPⅢ测量网形,用以提高测量精度。为验证优化后网形相较于标准自由测站边角交会网的相对点位精度增益情况,设计仿真计算实验。模拟计算5种平面控制网(标准CPⅢ平面网+4种优化网)相邻点相对点位中误差和最弱点点位中误差。其中,对5种平面控制网分别模拟1 km、4 km两种长度各100组,并与对应的小范围实测结果进行对比分析。研究表明,提出的CPⅢ平面网Ⅱ类和Ⅳ类优化网形相邻点相对点位中误差较标准网提高约30%,Ⅰ类优化网形相邻点相对点位中误差较标准网提高约10%,前者可用于更高速度高铁的CPⅢ平面网测量,后者对于提高现行CPⅢ平面网的精度和可靠性效果显著。

At present,the Chengdu-Chongqing High-speed Railway under construction has a speed increase space of 400 km/h.In order to study the CPⅢplane network optimization network with independent intellectual property rights and meet the requirements of higher speed high-speed rail track smoothness measurement and control accuracy,four optimized CPⅢmeasurement network shapes were proposed to improve the measurement accuracy.To verify the relative point accuracy gain of the optimized network shape compared with the standard free station side-angle intersection network,a simulation calculation experiment was designed.Five kinds of plane control network(standard CPⅢplane network+four kinds of optimization network)adjacent point relative error and the weakest point error were simulated and calculated.Among them,100 groups of 1 km and 4 km lengths were simulated for 5 kinds of plane control networks,and compared with the corresponding small-scale measured results.The research shows that,the relative error of the adjacent points of typeⅡand type IV optimized network is about 30%higher than that of the standard network,and the relative error of the adjacent points of the I optimized network is about 10%higher than that of the standard network.The former can be used for CPⅢplane network measurement of higher speed high-speed railway,and the latter also has a significant effect on improving the accuracy and reliability of the current CPⅢplane network.