Tunnel Fire Testing With Real-Time Numerical-Physical Fusion
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Solution Overview
Problem
Traditional research methods for thermo-mechanical coupling problems in large complex tunnel structures under fire conditions are inadequate, as they fail to consider the tunnel structure-stratum as a composite system, leading to inaccuracies in simulating key issues like structure-soil contact and stress deformation, and cannot accurately reflect the real fire response under complex geological conditions.
Innovation Solution
A fire test system and method that integrates real-time fusion of numerical and physical spaces, using a physical test unit for holographic fire testing and a numerical analysis unit for multi-field coupling boundary data, with a fusion control unit to adjust and update parameters, simulating the entire tunnel structure and stratum environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If solely numerical simulation is used, then research efficiency is improved, but measurement precision and reliability of fire response prediction deteriorate due to large deviations in structure-soil contact simulation
Solution Approach 1:
The patent merges numerical simulation with physical model testing into a coupled research system. The physical model provides accurate boundary condition data from real fire tests, which is then used to calibrate and validate the numerical simulation model, combining the efficiency of numerical methods with the precision of physical experimentation.
Solution Approach 2:
The system implements feedback by using measurement data from physical model tests to continuously refine and update the numerical simulation parameters. The physical test results provide feedback on actual fire response behavior, which is then fed back into the numerical model to improve its predictive accuracy for structure-soil contact and thermal-mechanical coupling.
2Device complexity
If scale model test is used, then device complexity is reduced, but measurement precision deteriorates as it cannot reflect real fire response under complex geological conditions
Solution Approach 1:
The patent introduces a numerical simulation model as an intermediary between the simplified scale model test and the complex real-world conditions. The numerical model acts as a bridge that takes boundary conditions from the scale model and translates them into predictions for full-scale complex geological conditions, allowing the simple physical model to provide data while the numerical model handles the complexity.
3Measurement precision
If full-scale fire test is conducted, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent segments the research system into a physical model test component and a numerical simulation component. The physical model is scaled down to reduce equipment complexity and cost, while the numerical simulation handles the complex calculations and full-scale predictions, dividing the tasks between physical experimentation and computational modeling.
4Ease of operation
If traditional experimental methods are used, then ease of operation is maintained, but reliability deteriorates as they cannot consider tunnel structure-stratum as a composite system
Solution Approach 1:
The patent applies the composite system concept by modeling the tunnel structure and surrounding stratum as a coupled composite system. The physical model includes both the tunnel lining and surrounding soil/rock layers, and the numerical simulation models their interaction, treating them as a composite thermo-mechanical system rather than separate entities.
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 allows for accurate reflection of the real fire response and progressive failure mechanisms of tunnel structures, providing a theoretical foundation for improving fire safety in complex tunnel environments.
Implementation Method 1
a fire thermal environment simulation subsystem, to apply thermal loading
Implementation Method 2
the thermo-mechanical coupling problems of large complex tunnel structures at high temperature
Implementation Method 3
obtain multi-field coupling boundary data of the typical components
Data Source
AI summary
The present disclosure provides a fire test system and method for tunnel structure based on real-time fusion of numerical and physical spaces. The fire test system includes: a physical test unit, to perform a holographic fire test on the typical segment components of tunnel structure system in a physical space, to obtain holographic characteristic parameter data of the typical components; a numerical analysis unit, to establish a full-scale numerical model of the tunnel-stratum composite system in a numerical space, to obtain multi-field coupling boundary data of the typical components; and a fusion control unit, to control and adjust a multi-field coupling boundary of the physical space according to the multi-field coupling boundary data, and to update and adjust an input parameter of the numerical space according to the holographic characteristic parameter data.