Underground Cave Rock Stress Mapping With Numerical Inverse Analysis
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Solution Overview
Problem
Conventional methods for testing and identifying disturbance stress in underground cave rock are limited to local single points, making it difficult to accurately assess the three-dimensional stress changes and evolution process, which hinders precise evaluation and prediction of engineering disasters.
Innovation Solution
A stereoscopic identification method using a three-component microseismometer and disturbance stress gauges to collect data from multiple points, combined with numerical inverse analysis, to correct prediction values from point to volume, providing high-precision identification of disturbance stress evolution in three-dimensional space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple disturbance stress gauges are used to obtain disturbance stresses at multiple single-point positions, then the measurement coverage is improved, but the data limitation and difficulty in obtaining three-dimensional stress evolution is worsened
Solution Approach 1:
The patent transitions from single-point measurements to three-dimensional volumetric measurements by introducing a numerical inverse analysis system that processes data from multiple sensors to reconstruct stress fields throughout the entire rock mass volume, achieving measurement dimensionality enhancement
Solution Approach 2:
The patent introduces a numerical inverse analysis system as an intermediary that processes raw sensor data through computational models to derive three-dimensional stress evolution information, enabling the transformation of limited point measurements into comprehensive volumetric data
2Device complexity
If conventional single-point testing methods are used, then the device complexity is reduced, but the measurement precision for three-dimensional stress changes is worsened
Solution Approach 1:
The patent creates a multi-functional integrated system where disturbance stress gauges, microseismometers, and numerical inverse analysis work together to simultaneously achieve single-point precision and three-dimensional coverage, making the system universally applicable for comprehensive stress monitoring
Solution Approach 2:
The patent replaces direct mechanical three-dimensional stress measurement systems with a sensor-based approach combined with numerical inverse analysis, using computational methods to derive three-dimensional stress fields from limited physical measurement points
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate and effective prediction of three-dimensional instability in underground cave rock, supporting precise evaluation and prevention of engineering disasters by correcting overall prediction values based on collected data.
Implementation Method 1
collecting rock fracture vibration wave information on the periphery of the borehole through a three-component microseismometer placed in the borehole
Implementation Method 2
the grout is injected to make the disturbance stress gauge couple with the rock mass on the wall of the borehole; and the disturbance stress of the test point is obtained accurately by the disturbance stress gauge
Data Source
AI summary
A stereoscopic identification method and apparatus for disturbance stress evolution process of underground cave surrounding rock perform a numerical inverse analysis of three-dimensional stereoscopic disturbance stress of a surrounding rock of the target underground cave on the basis of measurement values of three-component microseismometers and disturbance stress gauges. During the analysis, the overall prediction values are corrected from point to volume based on the measurement values to achieve a high-precision identification effect of the evolution process of the stereoscopic disturbance stress of the surrounding rock.