Jointed Rock Mass Blasting Vibration Monitoring
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Solution Overview
Problem
Current blasting vibration monitoring systems for deep-mine tunnels fail to capture real-time crack evolution and cracking mechanisms in jointed rock masses, inadequately monitor the impact of blasting stress waves on tunnel stability, and are prone to errors due to electromagnetic interference and inability to record large deformations.
Innovation Solution
An improved system incorporating a three-way load loading subsystem, a model-surface blasting-vibration acquisition subsystem with a three-dimensional strain rosette and ultra-dynamic resistance strain gauge, and a model-interior dynamic stress-strain acquisition subsystem using fiber grating strain sensors and PVDF piezoelectric pressure sensors, which allows for real-time monitoring of crack growth and stability analysis under various blasting modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional strain measurement technology is used, then the system structure is simple, but it cannot monitor large deformations and is easily affected by electromagnetic interference
Solution Approach 1:
The patent replaces traditional electrical strain gauges with fiber optic sensing technology. Fiber grating strain sensors and PVDF piezoelectric pressure sensors are used to detect deformation and stress without being susceptible to electromagnetic interference from blasting operations, thereby improving measurement reliability while maintaining acceptable system complexity
Solution Approach 2:
The patent employs composite sensing approaches by combining fiber grating strain sensors with PVDF piezoelectric pressure sensors. This composite sensing system enables simultaneous measurement of both strain and pressure parameters, providing comprehensive monitoring capability that overcomes the limitations of single-type sensors
2Loss of information
If conventional monitoring systems are used, then the device complexity is low, but they cannot capture real-time crack evolution process
Solution Approach 1:
The patent segments the monitoring function into multiple specialized subsystems: fiber grating strain sensors for strain measurement, PVDF piezoelectric pressure sensors for pressure monitoring, and a high-speed photography system for visual crack documentation. This segmentation enables comprehensive crack evolution capture while organizing system complexity into manageable functional modules
Solution Approach 2:
The patent implements continuous real-time monitoring through the integration of multiple sensing systems that continuously record strain, pressure, and visual crack development throughout the blasting process. This continuous data acquisition ensures no crack evolution events are missed, providing complete information on crack initiation and propagation
3Measurement precision
If foil resistance strain gauge is used, then the measurement system is simple, but it cannot record large deformations and is affected by electromagnetic interference
Solution Approach 1:
The patent replaces foil resistance strain gauges with fiber optic sensing technology. Fiber grating strain sensors use optical wavelength shifts to measure strain, and PVDF piezoelectric pressure sensors use electrical charge generation from mechanical stress, both of which are immune to electromagnetic interference and capable of measuring large deformations with high precision
Solution Approach 2:
The patent changes the measurement parameter from electrical resistance change (in foil gauges) to optical wavelength shift (in fiber gratings) and piezoelectric charge generation (in PVDF sensors). This parameter change enables measurement of large deformations without electromagnetic interference, achieving superior measurement precision
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 real-time monitoring of crack evolution and stability analysis, effectively resisting electromagnetic interference and accurately recording large deformations, thereby providing reliable data on the impact of joint inclination angles and blasting modes on tunnel stability.
Implementation Method 1
the model-interior dynamic stress-strain acquisition subsystem includes fiber grating strain sensors
Implementation Method 2
the model-interior dynamic stress-strain acquisition subsystem includes PVDF piezoelectric pressure sensors
Implementation Method 3
the model-surface blasting-vibration acquisition subsystem includes an ultra-dynamic resistance strain gauge
Data Source
AI summary
A system of monitoring vibration of a blasting model test for a jointed rock mass and a method are provided. The system includes: a loading subsystem for three-way load, a model-surface blasting-vibration acquisition subsystem, and a model-interior dynamic stress-strain acquisition subsystem. The system and the method are provided, and a blasting model for a transparent jointed rock mass and a monitoring method that are obtained can analyze the influence of a joint inclination angle on propagation and attenuation laws of blasting stress waves in the jointed rock mass, and can analyze the influence of different millisecond blasting modes on the stability of an existing tunnel in the jointed rock mass, and can capture a real-time dynamic evolution process of cracks. The stress and strain measurement technologies used can perform omnibearing monitoring and recording for large deformations of surrounding rock under blasting load, and can resist the electromagnetic interference.