Abstract
To solve the problem of rational placement of measuring systems in concrete dams, the experience of full-scale observations of horizontal displacements and stresses in the body of the arch dam of Inguri HPP (Georgia) was used with the use of statistical processing of the results of observations and the Barlow-Hunter-Proshan mathematical model. The type of the law of distribution of horizontal displacements and arch stresses was established by analyzing the histograms of these measured indicators of the static state of the structure. It is established that the change of horizontal displacements along the dam height is well described by the one-sided normal distribution law, and the arch stresses in the controlled alignment - by the normal distribution law. The laws of distribution of random variables are established. Using the Barlow-Hunter-Proshan mathematical model enabled the use of economic criteria on the basis of the frequency characteristics of the indicators of trouble-free operation of the construction and obtain the recurrence relation for the sequence of coordinate points of the measuring systems. The results of calculations of the coordinates of the recommended location of straight plumb lines in the center console and tensometric rosettes in the measuring range of the Ingur dam at the level of 210 m for a rational placement scheme are presented. The calculation showed that the number of measuring systems installed in the body of the Ingur dam exceeds the optimum value.
Highlights
The design and construction of high hydropower facilities is closely related to in-situ observations and studies of their condition and operation, which are the most reliable and effective means of verifying the reliability of calculation methods and design decisions
To solve the problem of rational placement of plumb lines, the experience of observing the movements of the Ingur arch dam and the statistical method of analysis using the mathematical model of Barlow-Hunter-Proshan were applied
The distance between the strain Gauss sockets is determined by the normal Gauss distribution law and is expressed in terms of the Laplace function, which allows you to choose the sequence of their placement
Summary
The design and construction of high hydropower facilities is closely related to in-situ observations and studies of their condition and operation, which are the most reliable and effective means of verifying the reliability of calculation methods and design decisions. According to the results of field observations and studies during the construction and operation of dams, to monitor their condition with the help of measurement systems, laboratory tests and calculation methods, can be developed common methods of equipping facilities devices on a single principle. In the reports of the VI International scientific conference, held in November 2018 in Moscow in MISI-MGSU, much attention was paid to the necessity of equipping with modern measuring systems for monitoring the behavior of hydraulic structures from loads and external influences. For this purpose, a monitoring system (MS– Monitoring System) was developed. The experience of observing the overall deformation of the high dam: Ingur (Guziya), Vajont (Italy), Mauvoisin (Switzerland), Kurobe 4 (Japan), Chirkey (Russia), Sayano-Shushenskaya (Russia), Hoover (USA), Shoebuy (China) allows you to accurately and reliably estimate the static behaviour of the structure during reservoir filling and during operation [8,9,10]
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