子午线收敛角在煤矿测量中的应用

子午线收敛角在煤矿测量中应用广泛，特别是在矿区跨度范围较大的情况下，子午线收敛角尤为重要。煤矿测量中通常需要加测陀螺定向边来提高井下巷道测量精度，主要参数有陀螺方位角、坐标方位角、子午线收敛角、仪器常数等。采用中天法，通过对豫省东部某煤矿实测数据的计算和精度评定，测定所求井下陀螺定向边的坐标方位角，根据定向边的坐标方位角指导煤矿顺利贯通，保证煤矿安全生产。点位坐标决定子午线收敛角大小。实测中必须精确计算子午线收敛角，并对仪器常数和陀螺方位角进行精度评定。

Application of meridian convergence angle in coal mine survey

The meridian convergence angle is widely used in coal mine measurement，especially in the case of a large span of mines，the meridian convergence angle is particularly important.In the coal mine measurement，it was usually necessary to add the gyro-oriented edge to improve the measurement accuracy of the underground roadway.The main parameters were gyro azimuth，coordinate azimuth，meridian convergence angle，instrument constant and so on.Through the Zhongtian method，through the calculation and accuracy evaluation of the measured data of a coal mine in the eastern part of Henan Province，the coordinate azimuth of the directional side of the downhole gyro was determined and the coal mine was smoothly penetrated according to the coordinate azimuth of the directional edge to ensure the safe production of the coal mine.The point coordinates determine the size of the meridian convergence angle.In the actual measurement，the meridian convergence angle must be accurately calculated，and the instrument constant and the gyro azimuth angle should be accurately evaluated.