Vegetation Adhesion Correction for Slope Stability Analysis

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Solution Overview

Problem

Existing slope stability analysis techniques fail to quantify the effect of vegetation on slope stability, particularly due to the changing moisture content in soils, which affects vegetation adhesion and overall slope stability.

Innovation Solution

A device and system that calculate the corrected vegetation adhesion by using a moisture content-based correction value, acquired through a relational expression between moisture content and soil adhesion, to improve the precision of slope stability analysis.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If slope stability analysis is performed using conventional methods (Fellenius, Janbu, Bishop), then the analysis can be completed with standard soil parameters, but the effect of vegetation on slope stability cannot be quantified

Engineering Contradiction:

Improveprecision of slope stability analysisVSAvoidcomplexity of analysis method

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The invention introduces a correction value that modifies the vegetation adhesion parameter based on moisture content. The correction value is calculated as the ratio of adhesion at current moisture content to adhesion at optimum moisture content, thereby adjusting the vegetation adhesion parameter to reflect actual slope conditions while maintaining the existing slope stability analysis framework

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention introduces a correction value as an intermediary parameter that bridges the gap between measured soil moisture content and vegetation adhesion. This correction value serves as a mediator that translates moisture content measurements into adjusted adhesion values that can be directly used in conventional slope stability analysis methods

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If vegetation adhesion is assumed constant regardless of moisture content, then the analysis is simpler, but the precision of stability calculation deteriorates due to ignoring moisture-dependent adhesion changes

Engineering Contradiction:

Improvesimplicity of calculationVSAvoidprecision of vegetation adhesion

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The invention transforms the static vegetation adhesion parameter into a dynamic one by introducing moisture content dependency. The vegetation adhesion is now calculated as the product of baseline vegetation adhesion and a correction value that varies with moisture content, allowing the parameter to adapt to changing environmental conditions while maintaining computational efficiency

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11206771B2Vegetation effect calculation device, vegetation effect calculation system, and storage medium storing vegetation effect calculation program

Publication Date: 2021.12.28 NEC CORP

AI summary

A vegetation effect calculation device includes: a memory configured to store instructions; and at least one processor configured to execute the instructions to: acquire a moisture content of a slope, a relational expression between the moisture content and an adhesion of soil in the slope, and a vegetation adhesion that is an adhesion of vegetation abundantly growing in the slope; calculate a correction value, using the acquired moisture content of the slope, and the acquired relational expression between the moisture content and the adhesion of the soil; and calculate a corrected vegetation adhesion, using the acquired vegetation adhesion, and the calculated correction value.