Study on Construction Control Network Survey of Dongzhuang Water Conservancy Project
In order to meet the survey and design accuracy requirements of the main structures of the Dongzhuang Water Conservancy Pro-ject 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 sur-face 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 inde-pendent coordinate systems for construction in areas with large elevation differences.
Dongzhuang Water Conservancy Projectconstruction control networkGNSS surveyingtriangulateration network surveyingprojection elevation surface
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