Three-Parameter Slope Stability Evaluation Method
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Solution Overview
Problem
Traditional slope stability evaluation methods fail to accurately consider the differential contributions and attenuations of cohesion, internal friction angle, and tensile strength in slope instability, leading to insufficient theoretical basis and inaccurate comprehensive safety factor calculations.
Innovation Solution
A three-parameter strength reduction method that reduces cohesion, internal friction angle, and tensile strength by different reduction factors, using a mechanism of matching reduction and deriving a comprehensive safety factor based on the sudden change of characteristic point displacement, to reflect the distinct contributions and attenuations of these parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cohesion and internal friction angle are reduced by the same reduction factor in traditional strength reduction method, then the calculation is simple, but the differential contributions and attenuations of different shear strength parameters in slope instability are not considered
Solution Approach 1:
The patent segments the reduction process by introducing different reduction factors Fc and Fφ for cohesion and internal friction angle respectively, instead of using a single unified reduction factor. This segmentation allows differential attenuation of different shear strength parameters to be considered accurately.
Solution Approach 2:
The patent changes the parameter representation by introducing the matching reduction mechanism with relational expression Fφ = f(Fc), transforming the problem from using a single reduction factor to using correlated reduction factors that reflect the differential attenuation characteristics of different strength parameters.
2Ease of operation
If tensile strength is not considered in traditional strength reduction method, then the analysis is simpler, but the actual tensile failure of the slope is not accurately reflected
Solution Approach 1:
The patent segments the strength parameters into two independent systems: shear strength parameters (cohesion and internal friction angle) and tensile strength parameter. This segmentation allows tensile failure to be analyzed separately and combined with shear failure analysis, improving the reliability of failure prediction.
Solution Approach 2:
The patent introduces the relationship between tensile strength and shear strength parameters as an intermediary connection. By establishing how tensile strength relates to cohesion and internal friction angle, the method enables comprehensive evaluation of both tensile and shear failures through a unified framework.
3Reliability
If comprehensive safety factor determination methods are used to evaluate slope stability based on Fc and Fφ, then the evaluation is more comprehensive, but the determination methods vary greatly and lack sufficient theoretical basis and clear physical meaning
Solution Approach 1:
The patent establishes a feedback mechanism where the comprehensive safety factor is determined by the relationship between Fc and Fφ through the matching reduction mechanism. The sudden change in characteristic point displacement provides feedback to identify the critical state, creating a closed-loop determination process with clear physical meaning.
Solution Approach 2:
The patent uses the sudden change of characteristic point displacement as an indicator (analogous to a color change indicator) to identify slope instability. This provides a clear, observable criterion for determining the comprehensive safety factor, making the determination process transparent and physically meaningful.
Data Source
AI summary
Disclosed is a three-parameter strength reduction method for slope stability evaluation. The present disclosure reflects the difference in the attenuation and contribution of the cohesion, internal friction angle and tensile strength in the process of slope instability by reducing the three parameters by different reduction factors. Based on the sudden change of the characteristic point displacement of the slope as a criterion of slope instability, the present disclosure derives the fitting relationship between the characteristic point displacement and the cohesion reduction factor. The present disclosure assumes that the comprehensive safety factor satisfies a linear relationship with the cohesion reduction factor, the internal friction angle reduction factor and the tensile strength reduction factor and derives the relationship between the comprehensive safety factor and the cohesion reduction factor. Finally, the present disclosure summarizes and proposes a three-parameter strength reduction method and provides the steps for analyzing the slope stability through this method.