Displacement monitoring method for judging dam stability

Abstract

The invention relates to the field of stability estimation, monitoring and early warning of water conservancy projects, in particular to the technical field of stability monitoring and estimation of a reservoir dam. A displacement monitoring method for judging dam stability includes steps of (1) determining an integral range of a dam body and detection reticles; (2) setting a dam displacement reference monitoring point; (3) installing a monitoring device and acquiring data; (4) determining dam trend displacement statistical magnitude r; (5) determining integral trend displacement critical statistical magnitudecriterion rd of the dam; (6) analyzing and judging the integral trend displacement r of the dam; (7) calculating and determining the integral trend displacement rate k of the dam; (8) estimating the integral stability of the dam and warning instability risk. The displacement monitoring method can warn instability of the dam by levels and provides reference for protection and management of the dam.

Description

technical field [0001] The invention relates to the field of stability evaluation and monitoring and early warning of water conservancy projects, in particular to the technical field of stability monitoring and evaluation of reservoir dams. Background technique [0002] As a key hub project of a major water conservancy project, the stability and safety of the dam is directly related to the normal operation of other auxiliary projects of the entire water conservancy project, and directly affects and determines the overall safety and design benefits of the major water conservancy project. Its stability and safety are directly related to the life and property safety of the people in the downstream area, social and economic construction and ecological environment safety. External factors such as extreme flood pressure fluctuations caused by extreme rainfall, earthquakes, and man-made loads, as well as internal weak links such as dam materials, aggravate the stability of the dam ...

AI Technical Summary

Problems solved by technology

Defects in engineering design and limitations of human knowledge lead to the risk of dam failure. How to effectively monitor the stability of the dam and make scientific and accurate predictions of its stability evolution trend and dam failure risk based on the monitoring results Important issues and difficult problems to be solved urgently in the field of hydraulic engineering safety evaluation

[0003] At present, domestic and foreign reservoir safety evaluation techniques and methods are mainly divided into three types: traditional qualitative criterion method, comprehensive evaluation analysis method (comprehensive scoring method, analytic hierarchy process, risk assessment analysis method and fuzzy comprehensive evaluation method) and mathematical model: traditional The qualitative criterion method is to diagnose the defects of the dam and qualitatively identify the safety level of the dam through the regular inspection of the dam safety, but it is only suitable for evaluating a single project, and does not consider various uncertain factors that affect the safety of the dam. The evaluation conclusions are not clearly pertinent, and the reference value is limited; the comprehensive evaluation analysis method refers to the comprehensive evaluation of the multi-level and multi-objective structural system of dam safety through targeted evaluation methods, and the evaluation index set of dam safety influencing factors It is not easy to determine, the construction of the evaluation system is not perfect, and the selection of the comprehensive safety evaluation method is unreasonable. Although the influence degree and weight of some influencing factors can be quantitatively considered through some calculation methods, the consideration of the influencing factors is not complete, and the evaluation results are still not enough. Reliable, the evaluation conclusion is very unreasonable; the mathematical model belongs to the form of display function, through the physical interpretation of each component in the model to predict and analyze the dam, the mathematical model needs to be established on the basis that the mathematical expectations of the observation error are all Under the assumption that the observations are zero, each observation is independent of each other, and the observation errors are normally distributed, the accuracy of the model depends on the selection of modeling factors, which leads to problems such as poor prediction effect and deviation from the development trend in the prediction analysis.

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