Triaxial Hopkinson Bar for Deep Rock Thermal-Stress-Pore Pressure Coupling
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Solution Overview
Problem
Current experimental methods and equipment are inadequate for studying the dynamic mechanical properties and fracture behavior of deep rock under high geostress, high ground temperature, and high water pressure conditions, as they fail to simulate real deep rock environments effectively, especially under thermal-stress-pore pressure coupling conditions.
Innovation Solution
A thermal-stress-pore pressure coupled electromagnetic loading triaxial Hopkinson bar system is introduced, featuring real-time thermal and pore pressure loading systems, along with a servo-controlled axial and confining pressure system, to simulate dynamic loading conditions similar to deep rock environments, allowing for precise control of stress waves and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Hopkinson bar or modified Hopkinson bar is used for rock dynamic impact tests, then the test can be conducted with simple equipment structure, but the test environment cannot simulate real deep rock mass environment with high geostress, high ground temperature, and high water pressure
Solution Approach 1:
The patent merges multiple loading systems (axial pressure loading system, confining pressure loading system, thermal loading system, pore pressure loading system) with the Hopkinson bar system into an integrated triaxial Hopkinson bar system. This combination allows simultaneous application of high geostress, high ground temperature, and high water pressure conditions while maintaining dynamic impact testing capability, thereby simulating real deep rock mass environment effectively
Solution Approach 2:
The triaxial Hopkinson bar system is designed with multi-functional loading capabilities that can apply axial pressure, confining pressure, thermal loading, and pore pressure simultaneously. The system serves multiple functions: static triaxial loading, dynamic impact loading, thermal-stress coupling, and pore pressure control, making it universally applicable for studying rock dynamics under various deep underground conditions
2Reliability
If rock specimen is heated and cooled before dynamic impact test to study thermal effect, then the influence of temperature on rock properties can be understood, but the test cannot reflect real deep thermal-stress-pore pressure coupled environment
Solution Approach 1:
The patent combines thermal loading system with stress loading system and pore pressure loading system into an integrated triaxial Hopkinson bar system. The thermal loading system includes heating devices and temperature control mechanisms that can apply high ground temperature conditions simultaneously with high geostress and high water pressure, creating a coupled thermal-stress-pore pressure environment that accurately reflects real deep underground conditions
Solution Approach 2:
The system enables simultaneous control and variation of multiple parameters (temperature, axial stress, confining stress, pore pressure) during dynamic impact testing. The thermal loading system can maintain specified temperature ranges while the stress and pore pressure systems independently control their respective parameters, allowing comprehensive study of parameter coupling effects on rock dynamic properties
3Measurement precision
If existing test equipment is used for rock dynamics under deep conditions, then the equipment structure remains simple, but the test results cannot truly and comprehensively reflect dynamic mechanical properties and failure behavior of deep in-situ rock mass
Solution Approach 1:
The patent replaces conventional mechanical loading approaches with an integrated multi-field coupling system that incorporates electromagnetic pulse generation for dynamic impact, servo-controlled pressure systems for precise stress application, and thermal loading systems for temperature control. This substitution enables precise measurement of dynamic mechanical properties under coupled thermal-stress-pore pressure conditions, truly reflecting deep in-situ rock mass behavior
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 system enables more accurate and reliable testing of rock dynamics under multi-field coupling conditions, improving the effectiveness and reliability of dynamic test results by maintaining stable axial and confining pressures and simulating real stress environments.
Implementation Method 1
a dynamic impact load is applied to the rock specimen through the Hopkinson bar using an electromagnetic pulse generator
Implementation Method 2
a real-time thermal loading and controlling system... to simulate dynamic loading conditions similar to deep rock environments
Implementation Method 3
a real-time pore pressure loading and controlling system... to simulate dynamic loading conditions similar to deep rock environments
Implementation Method 4
a servo-controlled axial and confining pressure system, to simulate dynamic loading conditions similar to deep rock environments, allowing for precise control of stress waves and temperature
Data Source
AI summary
The present disclosure provides a thermal-stress-pore pressure coupled electromagnetic loading triaxial Hopkinson bar system and test method, the system mainly consists of an electromagnetic pulse generation system, a servo-controlled axial pressure loading system, a servo-controlled confining pressure loading system, a thermal control system, a pore pressure loading system, a bar system, and a data monitoring and acquisition system. Based on the conventional Hopkinson bar, the present disclosure creatively introduces a real-time loading and control system for confining pressure, thermal, and pore pressure, aiming to solve the technical problem that the existing test apparatus cannot be used to study dynamic response of deep rock mass under the coupling effect of thermal-stress-pore pressure and dynamic disturbance during dynamic impact loading.