Model and method for studying landslide surge propagation law and predicting dam life

Abstract

The invention belongs to the field of hydraulic engineering, and provides a model and a method for studying landslide surge propagation rules and predicting the service life of a dam, and aims to build a landslide surge model which can embody interaction of a landslide mass and a water body and can take features of the landslide surge in river channels into consideration on the premise that materials and movement states of the landslide mass are considered. According to the method, a reservoir landslide surge calculation model is built on the basis of a water wave model algorithm adopting an N-S (Navier-Stokes) equation, with combination of a numerical simulation and landslide surge model test and with use of source data acquired by relevant instruments, the rationality and universality of the built landslide surge calculation model are verified through multiple landslide surge model schemes, a lost boundary surface is introduced for consideration of a dam damage effect, not only are the landslide surge propagation rules disclosed, but also one method for predicting the residual life of the dam is worked out, and theoretical basis and scientific evidence are provided for further study of the landslide surge propagation rules and reasonable prediction of the service life of the dam.

Description

technical field [0001] The invention belongs to the field of water conservancy engineering, and in particular relates to a model and a method for studying landslide surge propagation law and dam life prediction. Background technique [0002] In water conservancy projects, landslides on the bank of reservoirs caused by extreme precipitation caused by global warming occur from time to time, and the surges caused by landslides entering the water are likely to cause damage to waterway projects, ports and water conservancy facilities, and people's lives and property in nearby areas. cause major geological disasters. The swell generated by large-scale high-speed landslides not only spreads in the upstream and downstream of the river and causes timely damage, but more seriously, the spread and superposition of swell may cause floods, flooding of dams and other reservoir accidents, channel blockage, ship capsizing, etc. ACCIDENT. [0003] After the dam is built, it will be affecte...

AI Technical Summary

Problems solved by technology

The swell generated by large-scale high-speed landslides not only spreads in the upstream and downstream of the river and causes timely damage, but more seriously, the spread and superposition of swell may cause floods, flooding of dams and other reservoir accidents, channel blockage, ship capsizing, etc. ACCIDENT

[0003] After the dam is built, affected by many factors such as temperature, humidity, and load, the performance of the material will deteriorate, and the strength, stiffness, and resistance of the concrete material will decay with the accumulation of damage, which will eventually lead to a decrease in the performance and life of the structure, or even damage

If extreme precipitation causes floods and landslides occur in the reservoir area, once the high water level formed in a short period of time and the landslide surge generate water wave coupling and superimposition, in addition to causing flooding accidents, the high-speed flowing water and shock waves may also cause damage to large areas. Dam structural safety causes further dynamic damage

If the dam fails to withstand the above loads, the consequences will be disastrous

[0004] Once a large reservoir is impounded, due to the impact of the high water level of the reservoir and its operational effects, the slopes with geological hazards in the reservoir area are likely to be exposed and cause disasters, resulting in large-scale landslides and reservoir water surges

The Qianjiangping landslide that occurred in the Three Gorges Reservoir area in July 2003 was induced by the water storage of the reservoir. The landslide’s highest surge reached 39m, and the landslide spread as far as 30km in the reservoir, causing a large number of casualties and property losses.

[0005] At present, there are many studies on the formation mechanism of landslide surges in the reservoir area, the prevention of dam damage and the measures to prolong the life of the dam. However, in the traditional landslide model, the landslide body is regarded as a rigid body, and the landslide body is not considered. The problem of the interaction between water body and gas, in the study of the landslide surge parent, also focuses on the free channel to discuss the propagation of the water wave in the free straight channel after the landslide enters the water, and does not study the relative closure of one end (the downstream dam ), the problem of wave propagation in a curved channel with a relatively free end, and no research on the random oscillation of the wave bounded by the irregular boundary and the impact reflection of the wave on the dam

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