When studying deformations of engineering structures by geodetic methods, special attention is paid to the process of assigning measurements accuracy. The choice of the method and means of measurement, material and labor costs, reliability of the obtained data depend on the results of accuracy assignment. The notion of deformation measurements accuracy has a double meaning. It can refer both to initial accuracy of determination of deformation value itself and to accuracy of geodetic measurements themselves. In particular, as applied to monitoring, it is possible to speak about an error of definition of deformations of buildings and constructions and to solve a problem of finding excesses in cycles of leveling, and then assignment of the corresponding class of leveling. At the stage of design works, the class of leveling is assigned in accordance with the necessary accuracy of vertical movements on the basis of the requirements of normative and technical documentation. The existing procedure leads to assignment of a higher class of leveling without sufficient justification, which leads to overestimation of labor costs and the cost of field observations at oil and gas production sites.
Oil Company Rosneft proposed a methodology that allows to improve the quality of design decisions in the construction of leveling networks and the appointment of the optimal class of leveling while maintaining the required accuracy of measurements. The calculation methodology is based on the construction of the optimal configuration of the leveling network and selected preliminary calculation of the network accuracy, the calculation of the mean square error of the weakest point of the leveling network, based on which the desired accuracy of geodetic observations and leveling class are calculated. The methodology will increase the reliability of the obtained observation results, which will be carried out with the necessary reasonable accuracy, and will also reduce the operating costs of geodetic observation production.
References
1. Klyushina E.B., Mikheleva D.Sh., Barkov D.P., Praktikum po prikladnoy geodezii (Workshop on applied geodesy), Moscow: Nedra Publ., 1993, 368 p.
2. Zhukova B.N., Rationing the accuracy of geodetic measurements during the construction of structures, installation of equipment and monitoring their condition (In Russ.), Izvestiya vuzov. Geodeziya i aerofotos"emka, 1983, no. 4, pp. 28–35.
3. Gruzin N.E., Miskovets V.K., On the required accuracy of measuring deformations of building structures (In Russ.), Inzhenernaya geodeziya,1981, no. 24, pp. 42–44.
4. Shekhovtsov G.A., On the accuracy of geodetic observations of deformations of structures (In Russ.), Geodeziya, kartografiya i aerofotos"emka, 1975, V. 22, pp. 88–93.
5. Shekhovtsov G.A., On the required accuracy of geodetic observations of deformations of structures (In Russ.), Izvestiya vuzov. Geodeziya i aerofotos"emka, 1976, no. 1, pp. 25–30.
6. Zhukov B.N., Skripnikov V.A., Skripnikova M.A., Prikladnaya geodeziya. Geodezicheskiy kontrol' sooruzheniy i oborudovaniya v protsesse stroitel'stva i ekspluatatsii (Applied geodesy. Geodetic control of structures and equipment during construction and operation), Novosibirsk: Publ. of SGUGiT, 2018, 86 p.
