Seismic Wave Tomography for Coal and Rock Mass Structural Abnormality Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for monitoring the structural abnormal areas of coal and rock masses in mines are inadequate, as they fail to provide accurate and long-term dynamic monitoring, especially due to limitations in seismic wave excitation and propagation, leading to instability and safety concerns.
Innovation Solution
A method and device utilizing a drop hammer impact seismic source to generate seismic waves, which are detected by geophones, allowing for the creation of a target velocity inversion map through seismic wave tomography, enabling the identification of structural abnormal cells and areas by analyzing wave velocity trends and thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional monitoring methods are used for coal and rock mass structures, then the monitoring process is simple, but the measurement precision and reliability are insufficient
Solution Approach 1:
The system performs multi-cycle velocity inversion monitoring to dynamically track changes in coal and rock mass structure over time, transforming static monitoring into a dynamic process that captures evolution of structural abnormalities
Solution Approach 2:
The system monitors changes in seismic wave velocity parameters across multiple detection cycles to identify structural abnormalities, using parameter variation trends rather than single-point measurements to improve detection accuracy
2Measurement precision
If seismic wave tomography is performed with multiple excitation points, then the measurement precision improves, but the loss of time increases
Solution Approach 1:
The system establishes an initial velocity model before formal inversion, and performs progressive iterative refinement, preparing the inversion framework in advance to reduce actual detection time
Solution Approach 2:
The system uses velocity models from previous detection cycles as initial models for subsequent cycles, maintaining continuous refinement of the velocity inversion without restarting from scratch, thereby reducing repeated detection time
3Reliability
If the monitoring system covers the entire life cycle of the mine, then the reliability of safe production guidance improves, but the loss of time and resources increases
Solution Approach 1:
The system provides feedback through velocity variation trend analysis and structural abnormal cell identification, enabling adaptive adjustment of monitoring intensity based on detected changes, thereby improving reliability without requiring constant maximum-intensity monitoring throughout the entire mine life cycle
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
This approach enables stable and continuous monitoring of coal and rock mass structures, providing accurate detection of structural abnormalities and assisting in rock stratum control, thereby enhancing mining safety and stability.
Implementation Method 1
acquiring a target velocity inversion map of a coal and rock mass in a target detection cycle, in which the target velocity inversion map is configured to indicate a target velocity of seismic wave propagation
Implementation Method 2
any one of the geophones receives seismic waves excited from each of the excitation points, acquiring a first arrival time of the seismic waves excited at each of the excitation points
Implementation Method 3
determining, according to the first arrival time of the seismic waves excited at each of the excitation points, the target velocity inversion map of the coal and rock mass in the target detection cycle by a seismic wave tomography
Data Source
AI summary
A method for detecting a structural abnormal area of a coal and rock mass is provided. The method includes acquiring a target velocity inversion map of the coal and rock mass in a target detection cycle, in which the target velocity inversion map is configured to indicate a target velocity of seismic wave propagation in each of grid cells in a target detection area, acquiring a first velocity of seismic wave propagation in any one of the grid cells in at least one detection cycle preceding the target detection cycle, determining, according to each of the first velocities and the target velocities, structural abnormal cells from each of the grid cells, and determining, according to the structural abnormal cells, a range of the structural abnormal area of the coal and rock mass in the target detection cycle in the target velocity inversion map.