Prestressed Loading Frame for Deep Cavern Model Testing
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Solution Overview
Problem
Conventional large-scale three-dimensional physical model test machines struggle to control self-deformation during loading, lack precision in artificial model preparation, and are unable to simulate long-time load holding and dynamic disturbances, limiting the study of deep engineering rock mass mechanics.
Innovation Solution
A large-scale three-dimensional physical model test system featuring a prestressed frame structure, separate preparation and loading areas, and a multifunctional hydraulic loading system for long-time load holding, dynamic disturbance simulation, and multi-point cooperative displacement control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the scale and complexity of deep cavern groups are increased, then the research capability on deep engineering rock mass mechanics is improved, but the self-deformation of test machine during loading increases and cannot be effectively controlled
Solution Approach 1:
The test machine is divided into multiple independent hydraulic support units, each capable of independent displacement control. This segmentation allows the system to handle complex loading scenarios while maintaining control over self-deformation through distributed multi-point cooperative control, resolving the contradiction between increased research capability and test data reliability.
Solution Approach 2:
The system employs dynamic adjustment of hydraulic pressure and displacement parameters through computer-controlled hydraulic systems. By changing loading parameters in real-time based on feedback from multiple measurement points, the system can accommodate larger scale tests while maintaining control precision, thus improving research capability without sacrificing data reliability.
2Device complexity
If the preparation and loading of artificial model are carried out in the same box, then the device complexity is reduced, but the preparation precision of artificial model cannot be measured
Solution Approach 1:
The model preparation process is extracted and separated from the loading process. A dedicated preparation area is provided within the test machine where models can be prepared and measured with high precision before being transferred to the loading area. This separation eliminates interference between preparation and loading operations, ensuring model preparation precision while maintaining reasonable device complexity.
3Device complexity
If conventional test machine structure is used, then the device complexity is low, but the ability of long-time load holding and dynamic disturbance simulation is lacking
Solution Approach 1:
The hydraulic loading system is designed with multi-functionality, capable of performing static loading, dynamic disturbance simulation, and long-time load holding through a unified system architecture. The computer-controlled hydraulic supports can switch between different loading modes as needed, providing versatile research capabilities without requiring multiple separate machines, thus balancing device complexity with functional adaptability.
4Strength
If high strength artificial model materials are used, then the model strength is improved, but the self-deformation of test machine during loading increases
Solution Approach 1:
The system incorporates measurement and feedback mechanisms that monitor test machine deformation and loading conditions in real-time. Based on feedback from strain gauges and displacement sensors, the computer control system dynamically adjusts hydraulic support forces to compensate for test machine self-deformation, ensuring test reliability even when using high-strength model materials that require larger loading forces.
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 system effectively controls self-deformation, enhances data reliability, ensures precise artificial model preparation, and enables long-time load holding and dynamic disturbance simulation, allowing for comprehensive study of deep engineering rock mass mechanics.
Implementation Method 1
a load applying assembly (3), arranged on the anti-deformation prestressed loading frame assembly (2)... a model sample is subjected to long-time load holding, dynamic disturbance or displacement control overload
Implementation Method 2
A newly designed prestressed frame structure is adopted, the self-deformation of test equipment in the loading process can be effectively controlled
Implementation Method 3
the external dynamic disturbance simulating ability... the process that deep engineering rock mass is affected by combined action of dynamic disturbance such as excavation unloading, blasting, and mechanical vibration
Data Source
AI summary
A large-scale three-dimensional physical model test system for a deep cavern group comprises a base, an anti-deformation prestressed loading frame assembly, a load applying assembly, a model sample preparation and transportation assembly and a multifunctional hydraulic loading system assembly. The anti-deformation prestressed loading frame assembly and the model sample preparation and transportation assembly are both arranged on the base. The load applying assembly is arranged on the anti-deformation prestressed loading frame assembly, and the load applying assembly is connected with the multifunctional hydraulic loading system assembly. A model sample is subjected to long-time load holding, dynamic disturbance and displacement control overload under multi-surface multi-point cooperative control through cooperation between the load applying assembly and the multifunctional hydraulic loading system assembly.