Method for establishing engineering gravity ellipsoid

Abstract

The invention discloses a method for establishing an engineering gravity ellipsoid. The method includes the steps: determining the reference level elevation H0 of the engineering gravity ellipsoid andthe normal gravity value gamma e of the equatorial plane of the engineering gravity ellipsoid; and carrying out precise leveling in areas with high altitude and abnormally large space gravity; usingthe engineering gravity ellipsoid parameters to carry out leveling surface non-parallel correction calculation, wherein the absolute value of the correction value is much smaller than the magnitude ofthe correction value adopting a global gravity ellipsoid; only correction calculation is carried out in elevation control measurement, and correction calculation is not needed in construction measurement; and meanwhile, the problem that the height differences measured by different level routes are unequal is solved, so that the height difference correction calculation work in the construction period is greatly simplified, and the habit of not carrying out correction calculation in construction measurement is kept, and construction measurement is facilitated.

Description

technical field [0001] The invention relates to the technical field of precision leveling, in particular to a method for establishing an engineering gravity ellipsoid for unparallel correction of height difference levels. Background technique [0002] Due to the irregularity of the earth's surface and the uneven mass density inside the earth, the ground gravity changes, and the vertical distance between the two levels is not equal at different locations, that is, the natural phenomenon that the two levels are not parallel, resulting in different levels in leveling. The problem that the height difference between two points measured by the leveling line is not equal. [0003] According to the gravity field theory, the solution to this problem is to correct the non-parallel level of the height difference level. In the elevation system of normal height, the correction of level non-parallel is decomposed into two problems: correction of non-parallel normal level and correction o...

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Problems solved by technology

[0014] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art that the absolute value of the height difference correction number of the leveling survey obtained by using a global or national reference ellipsoid is too large, which will have an adverse effect on engineering construction, and provide a A method for establishing an engineering gravity ellipsoid, using the engineering gravity ellipsoid to correct the non-parallel level of the height difference level, can reduce the absolute value of the non-parallel correction of the normal level level and the correction value of the gravity anomaly, and make it easier to use in the construction measurement of the project It is not necessary to correct the height difference, so that it is convenient for construction application

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