东庄水利枢纽施工控制网测量研究

Study on Construction Control Network Survey of Dongzhuang Water Conservancy Project

为了满足陕西省泾河东庄水利枢纽工程主要建筑物测设精度要求,在东庄水利枢纽区利用一点一方位加抵偿高程面方法建立了独立坐标系,确定了边长投影变形量最小时抵偿高程面的最优值,对多种抵偿高程面独立坐标系成果进行试算,将不同的试算成果反算边长和夹角与TS60全站仪实测的边长和夹角进行了比较。结果表明:利用一点一方位加高程面方法建立的独立坐标系可以有效减小边长投影变形值,由于该项目地处高山峡谷,考虑大坝主施工区测设精度,可使长度投影变形尽可能小,投影面高程取860.00 m建立的独立坐标系较为合理,可最大限度的减小施工放样时由控制点带来的误差。研究成果对大高差地区施工独立坐标系的建立有参考意义。

In order to meet the survey and design accuracy requirements of the main structures of the Dongzhuang Water Conservancy Project in Jinghe,Shaanxi Province,an independent coordinate system is established in the project area using the one-point-one-axis plus compensation elevation surface method.The optimal value of the compensation elevation surface under the smallest side length projection deformation is determined.The results of various independent coordinate systems of compensation elevation surfaces are calculated,and the side lengths and angles calculated from different trial calculation results are compared with the side lengths and angles surveyed by the TS60 total station.The results show that the independent coordinate system established using the one-point-one-axis plus elevation surface method can effectively reduce the side length projection deformation value.Since the project is located in a high mountain valley,considering the survey and design accuracy of the main construction area of the dam,to minimize the length projection deformation,the independent coordinate system established with the projection surface elevation of 860.00 m is reasonable,which can minimize the error caused by the control point during construction layout survey.The study results are of reference significance for the establishment of independent coordinate systems for construction in areas with large elevation differences.