Triaxial Loading Device for Tunnel Model Stress Uniformity
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Solution Overview
Problem
Existing true triaxial tunnel and underground project model test systems face issues with uneven stress distribution, low loading capacity, cumbersome operation, and lack of automation, which affect the accuracy and reliability of test results and fail to effectively monitor precursor information for water inrush disasters in tunnels.
Innovation Solution
A fully automatic true triaxial tunnel and underground project model test system featuring a triaxial loading device, automatic data collection and analysis system, and intelligent control system, which applies three-way pressure and collects multi-field information to simulate actual rock stress states and provide real-time data analysis for early warning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional loading devices are used in true triaxial tunnel model test systems, then the system structure is simple, but uneven stress distribution and unnecessary shear stress occur on test pieces, affecting test accuracy
Solution Approach 1:
The loading device is divided into six independent hydraulic jacks arranged in specific positions, each responsible for applying load in a particular direction. This segmentation allows independent control of stress components, eliminating uneven stress distribution and unnecessary shear stress while maintaining manageable system complexity through modular design.
Solution Approach 2:
Rigid connecting rods are introduced as intermediary elements between the hydraulic jacks and the test piece. These connecting rods transmit force uniformly to the test piece surfaces, ensuring even stress distribution. The connecting rods act as mediators that decouple the loading mechanism from the test piece, preventing direct transmission of shear stresses and ensuring purely compressive loading.
2Force
If flexible bladder or hydraulic pillow loading is used, then the system structure is simple, but loading capacity is insufficient to simulate high geostress state
Solution Approach 1:
The system employs six hydraulic jacks with hydraulic pistons and cylinders to generate and apply compressive forces to the test piece. The hydraulic system provides high loading capacity capable of simulating deep burial geostress states. The hydraulic fluid transmits force efficiently, enabling the system to achieve the necessary stress levels for simulating deeply buried rock mass conditions.
Solution Approach 2:
The system enables independent adjustment of stress parameters in three orthogonal directions through the six hydraulic jacks. By changing the force parameters independently in each direction, the system can simulate various geostress states including high confining pressures, thereby achieving high loading capacity while maintaining flexibility in stress state configuration.
3Productivity
If manual operation is used in true triaxial tunnel model test systems, then the system is easy to operate, but it is cumbersome and requires a lot of manpower and material resources
Solution Approach 1:
The system incorporates sensors that continuously monitor stress, strain, and other parameters during the test. This feedback information is transmitted to the control system, which automatically adjusts the hydraulic jacks to maintain desired stress states or detect critical conditions. The feedback mechanism enables automated control, improving test efficiency while reducing manual intervention and resource requirements.
Solution Approach 2:
The control system is designed to automatically manage the testing process, including loading, data collection, and analysis. The system performs self-monitoring and self-adjustment through the feedback mechanism, reducing the need for manual operation. This self-service capability improves productivity by eliminating repetitive manual tasks while maintaining operational simplicity through automated decision-making.
4Loss of information
If traditional monitoring systems are used, then the system structure is simple, but precursor information monitoring for water inrush disasters is insufficient
Solution Approach 1:
The monitoring system integrates multiple types of sensors and monitoring elements that can detect various precursor information related to water inrush disasters. The system simultaneously monitors stress changes, strain variations, water pressure, and other parameters, providing comprehensive information about the evolution process of water inrush. This multi-functional approach ensures no critical information is lost while managing complexity through integrated design.
Solution Approach 2:
The system introduces a centralized control and data processing system as an intermediary between the sensors and the analysis. This intermediary collects, transmits, and processes data from multiple monitoring elements, making the precursor information accessible for analysis. The control system acts as a mediator that connects the monitoring components, ensuring comprehensive data collection while simplifying the overall system architecture through centralized processing.
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 achieves accurate and reliable test results with high loading capacity, reduces manpower and resource requirements, and effectively monitors precursor information for water inrush disasters, enhancing the identification and evolution rule of water inrush events in tunnels.
Implementation Method 1
the vertical, horizontal front and back, and horizontal left and right loading systems apply a three-way pressure to a model test body
Implementation Method 2
an optical fiber monitoring system, a micro pressure box and a strain brick, and can collect multi-field information such as model stress, displacement, osmotic pressure
Data Source
AI summary
Fully automatic true triaxial tunnel and underground project model test system, including a triaxial loading device for loading model test piece, automatic data collection and analysis device, power system and control system; triaxial loading device includes test bench, vertical loading system, horizontal front and back, and left and right loading systems, and the vertical, horizontal front and back, and left and right loading systems apply three-way pressure to model test body; test bench functions for supporting, fixing, and providing counter-force; automatic data collection and analysis device includes micro optical fiber sensor embedded in model test piece, optical fiber monitoring system, micro pressure box and strain brick, and can collect multi-field information.