Hypergravity Shield Tunnel Face Failure Simulation Device
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Solution Overview
Problem
Current hypergravity model test devices for simulating shield tunnel face failures face challenges in accurately controlling support pressure and monitoring surface settlement, particularly due to leakage issues and limited accuracy in simulating deep-buried tunnel conditions, which affects the precision of failure simulation and understanding of soil stress transfer mechanisms.
Innovation Solution
A hypergravity model test device utilizing a servo motor for precise control of a rigid plate movement, combined with multi-view stereo vision technology for non-contact monitoring of surface settlement, and optimized sealing to prevent leakage, allowing for accurate simulation of progressive failures and characterization of support pressure variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a foam strip is used to seal the gap between the shell and the rigid plate, then the device structure is simple, but leakage occurs affecting test accuracy
Solution Approach 1:
The patent replaces the foam strip with an O-shaped rubber seal ring that fits into a groove on the rigid plate. This flexible membrane solution provides effective sealing against leakage while maintaining ease of installation and replacement, directly resolving the contradiction between simple structure and reliable sealing.
2Adaptability or versatility
If pressure control is used to simulate deep-buried tunnel conditions, then the support pressure can be adjusted, but the pressure distribution is uneven affecting test accuracy
Solution Approach 1:
The rigid plate is divided into multiple independent pressure chambers separated by partition walls. Each chamber can be pressurized independently to different levels, allowing the simulation of non-uniform stress distributions that occur in deep-buried tunnels while maintaining precise control over the pressure profile.
Solution Approach 2:
Different regions of the rigid plate can apply different pressure levels to match the actual stress distribution in the tunnel face. The O-shaped rubber seal ring ensures that pressure is applied locally to specific zones without leakage, enabling accurate simulation of varying stress conditions at different depths and locations.
3Device complexity
If traditional monitoring methods are used for surface settlement, then the equipment is simple, but the measurement accuracy is limited and contact disturbance occurs
Solution Approach 1:
The patent replaces traditional contact-based mechanical monitoring devices with a video camera system that uses optical fields to capture and analyze surface deformation. This non-contact method eliminates measurement disturbance while providing high-precision three-dimensional settlement data through image processing, directly resolving the contradiction between system simplicity and measurement accuracy.
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 enhances the accuracy of simulating shield tunnel face failures, particularly for soft clay strata, by enabling precise control of the rigid plate and non-contact monitoring of three-dimensional soil deformation, thereby improving the understanding of failure mechanisms and their impact on ground surface settlement.
Implementation Method 1
the model is placed on a geotechnical centrifuge that is rotating at a high speed, such that the model is subjected to a stress state similar to that of a prototype
Data Source
AI summary
A hypergravity model test device for simulating a progressive failure of a shield tunnel face, including a model box, a shield tunnel model, a servo loading control system and a data acquisition system. The servo loading control system includes a servo motor, a planetary roller screw electric cylinder and a loading rod. The data acquisition system includes a displacement transducer, an axial force meter, a pore pressure transducer, an earth pressure transducer and an industrial camera. The servo loading control system is connected to an excavation plate through the loading rod to control the excavation plate to move back and forth along an axial direction of the shield tunnel model at a set speed to simulate failure of the shield tunnel face. A method for simulating a progressive failure of a shield tunnel face is also provided.