有砟轨道线路精测网控制法误差研究

Study on Precision Measurement Network Control Method Error of Ballasted Track Line

对有砟轨道精测网线形控制中存在的误差进行研究,分析精测网线形控制引起测站坐标轨道不平顺指标的误差大小,其误差产生来源主要包括两个方面:三维平差误差、点位变化误差。计算不同位置、不同数量的CPⅢ点发生变化时本测站、相邻测站平面坐标、高程误差,以及轨道平顺性指标受到的影响。结果表明:测站坐标误差随着CPⅢ点坐标变化量增大而增大,控制点距离测站越近,则其变化,对测站坐标的影响越大,与测站相距较远的控制点,其变化,对测站坐标的影响不敏感;本测站坐标误差最大值分别为1.732,1.668,1.626 mm,相邻测站坐标误差最大值分别为1.500,1.397,1.343 mm;轨道不平顺指标中,误差最大的为轨向,其次为轨距和水平,误差最小的为高低;距离测站最近的CPⅢ点各方向坐标变化量为1.0 mm时,轨距、水平、高低、轨向误差最大值分别为0.559,0.534,0.479,0.582 mm。

The precision measurement network control method is based on the plane coordinates of the line and the elevation of the railway line alignment control method.According to China's track precision control measurement system and the principle of the precision measurement network control method,the sources of error analysis of the precision measurement network control method mainly include two aspects of three-dimensional adjustment error and point change error.The results of calculating the plane coordinates,elevation error,and track smoothness index of the measured station and adjacent stations when the CPⅢpoints change at different positions and different numbers show that the coordinate error of the measuring station increases with the increase of CPⅢpoint coordinate change.The closer the control point is to the measured station,the greater the impact of its change on the coordinates of the measured station is;and the changes of the control point farther away from the measured station are not sensitive to the influence of the station coordinates;the maximum value of the coordinate error of the station are 1.732,1.668,1.626 mm respectively;the maximum coordinate error of adjacent stations are 1.500,1.397,1.343 mm;among track irregularity index,the largest error is the track direction,followed by the gauge and level,the smallest error is the height;When the coordinate change of the nearest CPⅢpoint from the station is 1.0 mm in each direction,the maximum values of track pitch,level,height,and track direction errors are 0.559,0.534,0.479,0.582 mm,respectively.