Method for determining stability of reservoir bank slope based on reservoir water level and displacement

Abstract

The invention belongs to the technical field of slope stability diction and slope disaster monitoring and precaution, and particularly relates to a method for detecting a displacement and reservoir water level coupling power prediction parameter and stability of a reservoir type slope geological disaster. According to the basic principle of damage mechanics, a skid resistance force and sliding force loading power parameter on the slope sliding face and a slope displacement response parameter are organically coupled, and the new method for determining the stability of the reservoir type slope is disclosed according to the organic coupling. The method can effectively overcome erroneous judgment or misjudgment caused by errors of slope physical and mechanics parameters, boundary conditions and the like in a traditional ultimate equilibrium mechanical evaluation method and meanwhile solves the problems that a traditional displacement time sequence prediction method cannot describe a slope power action mechanism in a quantitative mode and cannot stably unify instability criterion. The clear criterion is adopted to specifically express the stability state of the slope in different stages of the reservoir, and effective basis is provided for slope prediction forecast and precaution treatment.

Description

technical field [0001] The invention belongs to the technical field of slope stability detection and slope disaster monitoring and early warning, and in particular relates to a displacement and reservoir water level coupling dynamic prediction parameter and a stability detection method of reservoir-type slope geological disasters. Background technique [0002] The specific engineering characteristics of major water conservancy projects and the special regional geological environment and water environment conditions determine that reservoir-type slopes are potentially hugely influential, destructive and catastrophic. Especially in the past 20 years, with the rapid development of my country's economy, the demand for water conservancy power has also increased day by day. In this regard, my country has successively started construction of a series of major water conservancy projects with dam heights of 200-300m (Xiaowan Hydropower Station, 292m ; Xiluodu Hydropower Station, 278m;...

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Problems solved by technology

However, in the monitoring, early warning and prevention engineering practice of major catastrophic slopes, people have to admit that the limit equilibrium mechanics method only introduces the static equilibrium condition and the "Moore-Coulomb" criterion of material shear failure, avoiding the deformation coordination relationship and Corresponding constitutive relations, and the established model and parameters are static evaluation models without time parameters. Therefore, the limitations of this type of modeling often lead to accurate dynamic monitoring, early warning and evaluation of slopes with major complex boundaries and dynamic conditions. However, the traditional displacement monitoring and early warning method uses monitoring displacement and displacement rate and its change with time as the criterion and basis for judging whether the slope is stable or not. However, the time series relationship between displacement and displacement rate can only reflect The change law of slope deformation over time does not reflect the magnitude and change of the comprehensive sliding force that determines slope deformation and stability at all. Therefore, the above displacement prediction parameters and their changes are not sure about the slope stability state and evolution law. one-to-one correspondence

Because such methods and models cannot reflect the magnitude and change of slope dynamics, this determines that such prediction models can generally only explain the deformation and displacement process and law of slopes, but cannot explain the formation mechanism that causes slope deformation and instability. and mechanical dynamics, and there is no stable and unified instability criterion. Therefore, this also determines that the use of such methods in the prediction, prediction and prevention of major catastrophe slopes induced by complex water environment dynamics in major water conservancy projects must be greatly affected and affected. Especially for slopes whose displacement time-series curves are affected by hydrodynamic factors and environmental factors, showing multi-phase accelerated ladder-like oscillation changes, it will be extremely difficult to complete accurate forecasting, monitoring and early warning.

Liu Handong and Wang Sijing (2001) believed that since the law of slope displacement time series analysis is not based on the mechanism, it is difficult to make a direct analysis of the prediction results; American scholars B. Temel and Mualla (2005) pointed out that the statistical displacement prediction model It does not involve the mechanical characteristics and deformation mechanism of the slope, so its prediction results are often highly probable

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