Rock Burst Test Device Multiaxial Loading Simulation
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Solution Overview
Problem
Existing rock burst test devices cannot simulate the real stress environment of coal rocks and fail to monitor the failure process from multiple angles, limiting their ability to accurately replicate the dynamic disturbance-induced rock burst mechanism.
Innovation Solution
A dynamic disturbance-induced rock burst test device is developed, comprising a supporting platform, a square chest, loading plates, bar systems, an electromagnetic pulse emitting system, acoustic emission monitoring, high-speed cameras, electromagnetic radiation monitoring, and a confining pressure servo control loading system, which together simulate multiaxial and multi-way static and dynamic loading conditions and allow for comprehensive monitoring of the coal rock failure process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional true triaxial experimental device is used, then the device structure is simple, but it cannot simulate multiaxial and multi-way synchronous and asynchronous impact characteristics of coal rock
Solution Approach 1:
The device is divided into six independent bar systems (first to sixth bar systems) that can independently apply loads in different directions. Each bar system includes separate loading mechanisms, allowing multiaxial and multi-way synchronous/asynchronous impact characteristics to be simulated through coordinated operation of segmented components.
Solution Approach 2:
Each bar system is designed with universal functionality to apply both static confining pressure and dynamic impact loads. The bar systems can operate independently or in combination, enabling the same structural framework to simulate various stress states including true triaxial, biaxial, and uniaxial conditions.
2Reliability
If a traditional true triaxial experimental device is used, then the device is easy to operate, but it cannot simulate shear stress and end surface effect of coal rock
Solution Approach 1:
The bar systems incorporate dynamic loading capabilities with adjustable loading rates and controllable loading sequences. The loading plates can apply loads dynamically in different directions simultaneously or asynchronously, enabling simulation of shear stress and end surface effects through time-dependent stress application.
Solution Approach 2:
The device integrates acoustic emission monitoring systems and high-speed cameras that provide real-time feedback on coal rock response. This feedback enables precise control and adjustment of loading parameters to accurately simulate shear stress and end surface effects while maintaining operational control.
3Measurement precision
If direct external observation methods are used, then the detection equipment is simple, but the data collection and analysis are relatively simple and inaccurate
Solution Approach 1:
Acoustic emission probes are introduced as intermediary sensors that detect internal crack propagation signals from within the coal rock sample. High-speed cameras serve as intermediaries to capture dynamic failure processes at high frame rates. These intermediary measurement systems provide indirect but precise data about internal stress states and failure mechanisms that cannot be obtained through direct external observation.
Solution Approach 2:
Traditional mechanical observation methods are replaced with acoustic emission detection and high-speed optical imaging. The acoustic emission monitoring system detects elastic waves generated during crack propagation, while high-speed cameras capture visual information at microsecond intervals, substituting mechanical measurement with wave-based and optical-based detection for higher 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
The device effectively simulates the real stress environment of coal rocks, enabling the monitoring of the failure process from multiple angles, and provides insights into the dynamic disturbance-induced rock burst mechanism, enhancing the understanding and prediction of rock burst disasters in deep coal mines.
Implementation Method 1
an electromagnetic pulse emitting system arranged inside the bar system, one end of the electromagnetic pulse emitting system being provided with a square bar, and the other end of the square bar being connected with the loading plate; and used for emitting an electromagnetic pulse wave
Implementation Method 2
an acoustic emission monitoring system arranged inside the loading plate and used for detecting a crack propagation process
Implementation Method 3
a high-speed camera arranged on one side of the square chest and used for shooting a collapse process of the coal rock sample and kinetic energy quantitative analysis
Implementation Method 4
an electromagnetic radiation monitoring system arranged on one side of the supporting platform and used for monitoring an electromagnetic radiation signal inside the coal rock sample during dynamic fracture
Data Source
AI summary
Disclosed are a dynamic disturbance-induced rock burst test device and a test method. The test device comprise a supporting platform, a plurality of loading plates, an electromagnetic pulse emitting system, an acoustic emission monitoring system, a high-speed camera, an electromagnetic radiation detecting system and a confining pressure servo control loading system. The plurality of loading plates are arranged on a side wall of a coal rock sample and are placed inside a square chest, the electromagnetic pulse emitting system and the confining pressure servo control loading system are arranged inside a bar system, and an acoustic emission probe is arranged inside the loading plate. A three-dimensional real stress environment of the coal rock is simulated by simulating a shear stress through friction between the loading plate and the sample, as well as dynamic and static combined loading of multi-axial and multi-directional static confining pressure and stress wave disturbance.