Slope Stability Alarm Using Displacement Ratios
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Solution Overview
Problem
Existing slope monitoring systems face challenges in accurately determining alarm conditions for slope stability, as absolute movement measures are influenced by various factors, including displacement type, material, and external influences, leading to limited indication of failure risk.
Innovation Solution
A method and system that set multiple stability set points to calculate change ratios and time ratios based on displacement, velocity, or acceleration data, independent of viewing angle and direction, to generate alarms when specific conditions are met, ensuring timely warnings of slope instability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If absolute movement measures (displacement, velocity, acceleration) are used to trigger alarms, then the monitoring system can detect slope movement, but the alarm accuracy is limited because the measures are influenced by displacement type, material type, planes of weakness, complexity of sliding plains, temporal history of movements, and external influences
Solution Approach 1:
The system changes the parameters used for alarm triggering from absolute movement measures to relative movement measures. Specifically, it calculates the ratio of current movement to historical movement patterns, transforming the alarm criterion from detecting absolute values to detecting changes in behavior patterns, thereby achieving higher accuracy without significantly increasing system complexity
Solution Approach 2:
The system implements feedback by continuously comparing current movement data against historical movement patterns and adjusting alarm triggers based on the ratio of current to historical movement. This feedback mechanism allows the system to learn from past behavior and make more accurate predictions about potential failures, improving alarm accuracy while maintaining manageable system complexity
2Measurement precision
If monitoring apparatus is positioned at specific look angles to optimize measurement, then measurement accuracy improves, but the system becomes vulnerable to orientation-dependent errors (e.g., measured velocity is half the actual velocity at 60 degrees from the wall movement velocity vector)
Solution Approach 1:
The system dynamically adjusts its measurement and alarm triggers based on the actual movement characteristics detected, rather than relying on fixed geometric relationships. By continuously monitoring the ratio of current movement to historical movement and adapting alarm criteria accordingly, the system maintains accuracy regardless of the monitoring apparatus orientation, eliminating orientation-dependent errors
3Measurement precision
If multiple stability set points are used to calculate change ratios and time ratios, then alarm generation accuracy improves and viewing angle independence is achieved, but the system complexity increases
Solution Approach 1:
The system segments the alarm generation process into distinct stages by using multiple stability set points (first set point, second set point, third set point) that correspond to different movement thresholds. Each set point triggers a specific phase of analysis, dividing the complex alarm determination into manageable segments that process information sequentially, thereby reducing overall computational complexity while maintaining high accuracy
Data Source
AI summary
A method of generating an alarm indicating movement of a slope under inspection that sets an alarm if (1), where dX is a first measured displacement, dY is another measured displacement at a chosen difference from dX, and dZ is another measured displacement at a chosen difference from dY, and the corresponding times at which the chosen distances are measured are tA, tB and tC respectively for dX dY and dZ. So that an alarm is set if the ratio of the time taken for the slope to move between dY and dZ compared to moving between dX and dY is less than the ratio of the respective displacements.tC-tBtB-tA<dZ-dYdY-dX(I)