Мелиорация и гидротехника (Nov 2023)
The results of field studies of the settlement of an earthfill dam body
Abstract
The purpose: to conduct field studies to determine the vertical settlement in the body and assess the safety of the earthfill dam of the Lyangar reservoir. One of the ways to ensure the safe condition of earthfill dams during operation is to conduct field studies in the facility. One of the factors leading to the overflow over the structure crest is the settlement of the earthfill dam body. Excessive settlement of the earthfill dams of reservoirs are assessed on the basis of observational data and design documentation. In practice, the settlement of earthfill dams during the operational period should not exceed the values specified in the project. The quantitative determination of the settlement of the earthfill dam body was carried out on the basis of the requirements specified in the regulatory documents. Materials and methods. In the process of research, theoretical and generally accepted detection methods of vertical deformations on the crest of an earthfill dam using geometric leveling were used. The research and verification of tools was carried out in accordance with regulatory documents before carrying out the work. Results. Geodetic measurements were carried out on the example of the earthfill dam of the Lyangar reservoir. Repeated geodetic measurements (the second cycle) for determining the settlement of the earth dam crest were carried out. The longitudinal profile of the crest of the object under consideration was constructed on the results of geodetic measurements. During the observation period, the settlement of the earthfill dam crest was 15 mm in the first cycle and 18 mm in the second cycle. Conclusions. The indicators obtained as a result of geodetic measurements, when compared with the indicators given in the regulatory documents, testify that the safe state of the structure is ensured, which does not lead to water overflowing over the earthfill dam crest.
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