Suction Caisson Centrifuge Test Device with Guide Rail and Counterweight
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Solution Overview
Problem
Current centrifuge model tests for suction caisson penetration face issues with stability during continuous rotation, inability to maintain perpendicularity under centrifugal force, and difficulty in observing displacement and deformation of the suction caisson and soil during the penetration process.
Innovation Solution
A device for simulating suction penetration includes a model box with a suction caisson model, a vacuum system, and a penetration device featuring a guide rail and drive lever system, tempered glass for real-time observation, and sensors to monitor soil deformation and pressure changes, allowing for accurate simulation and analysis of suction penetration effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a traditional centrifuge model test is used for suction caisson penetration, then the test can be conducted under centrifugal force, but the perpendicularity of the suction caisson cannot be guaranteed and stability is poor during continuous rotation
Solution Approach 1:
The patent introduces a counterweight structure that balances the centrifugal forces acting on the suction caisson during rotation. The counterweight is positioned to offset the unbalanced forces, thereby maintaining stability and ensuring the suction caisson remains perpendicular to the soil surface throughout the penetration process under centrifugal acceleration.
2Force
If a traditional centrifuge model test is used, then centrifugal force can be applied, but real-time observation of displacement and deformation is difficult
Solution Approach 1:
The patent employs visual indicators such as colored tracer particles or dyed soil layers within the model box. These color changes or visual markers allow researchers to track and observe the displacement and deformation of soil and suction caisson in real-time during centrifuge rotation, making measurement feasible under dynamic conditions.
3Ease of operation
If suction penetration is implemented without a penetration device, then the vacuum pump can operate continuously, but the suction caisson cannot be controlled to penetrate vertically with perpendicularity
Solution Approach 1:
The patent introduces a penetration device as an intermediary mechanism between the vacuum system and the suction caisson. This device includes guide rails and positioning mechanisms that constrain the suction caisson to move vertically along a predetermined path, ensuring perpendicularity to the soil surface while allowing the vacuum pump to operate continuously without interruption.
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 ensures high stability and accuracy in centrifuge model tests, enables real-time observation of the penetration process, and provides detailed data for analyzing the static and dynamic characteristics of the suction caisson, addressing the limitations of existing tests.
Implementation Method 1
the suction force exerted on non-cohesive soil further causes seepage inside and outside the suction caisson
Implementation Method 2
the stress generated by the dead weight is small, which may be different from the soil plug phenomenon and the soil stress change law under practical working conditions. Therefore, the soil plug phenomenon and the soil stress change law that are closer to the practical working conditions can be obtained by a centrifuge model test
Data Source
AI summary
A device for simulating suction penetration of suction caisson based on centrifuge model test includes a model box, a suction caisson model in the model box and containing a suction caisson and a connecting rod, a penetration device disposed above the model box and movably connected to the connecting rod, a vacuum system connected to the suction caisson, a lower part of the suction caisson is provided with soil, and an upper part of the soil is provided with a water body. The penetration device includes a guide rail and a drive lever. The drive lever penetrates through the model box and then is connected to an electromagnetic adsorption device, a bottom end of which includes a guide housing, and the connecting rod is inserted into the guide housing. The device can dynamically correct displacement deviation in a suction penetration process, thereby being continuously tested in a centrifugal state.