Tunnel Lining Defect Mapping for Remaining Bearing Capacity
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Solution Overview
Problem
Existing methods for evaluating the service performance of tunnel linings in China do not establish a quantitative relationship between defect characteristics and the remaining bearing capacity or health degree of the tunnel, limiting their effectiveness in ensuring structural safety and efficiency in safety evaluations.
Innovation Solution
A method that simulates tunnel conditions using a model test to establish a corresponding relationship between defect characteristics and remaining bearing capacity, involving in-situ detection and a data-driven approach to determine the remaining bearing capacity interval of the tunnel lining based on defect characteristics such as vault subsidence, side wall convergence, crack density, and crack depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If model test method is used to establish corresponding relationship between defect characteristics and remaining bearing capacity, then measurement precision and reliability are improved, but device complexity and loss of time increase
Solution Approach 1:
The patent creates a scaled model tunnel (1:5 or 1:10 geometric similarity) that replicates the physical and mechanical properties of the actual tunnel through material similarity ratios. This copying approach allows comprehensive testing of defect characteristics and bearing capacity relationships without requiring full-scale tunnel construction, thus improving measurement precision while controlling device complexity through proportional scaling.
Solution Approach 2:
The patent systematically varies defect parameters (crack depth, crack width, back cavity size, reinforcing bar corrosion rate) in the model tunnel to establish quantitative relationships with remaining bearing capacity. By changing these parameters in controlled steps during model testing, the patent creates comprehensive data sets that define the corresponding relationships without requiring full-scale tunnel modification.
2Reliability
If comprehensive model testing is conducted to establish quantitative relationships, then reliability of safety evaluation is improved, but loss of time and device complexity increase
Solution Approach 1:
The patent performs comprehensive model testing in advance to pre-establish corresponding relationship tables between defect characteristics and remaining bearing capacity for various tunnel types and defect conditions. These pre-established relationships are stored and can be quickly applied to actual tunnel evaluations without repeating the extensive testing process, thus improving reliability while reducing the time loss in practical applications.
Solution Approach 2:
The patent uses a disposable model tunnel that can be tested to failure and then replaced. The model tunnel is designed to be destroyed during the testing process to obtain complete bearing capacity data, and a new model is constructed for subsequent testing phases. This approach allows comprehensive data collection without the need to preserve the test specimen, efficiently establishing quantitative relationships.
3Measurement precision
If detailed defect detection and model testing are performed, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The patent uses a model tunnel that replicates all critical defect characteristics and structural responses at a reduced scale. By testing the model instead of the full-scale tunnel, the patent achieves detailed measurement of defect-bearing capacity relationships with the same precision instruments, but the time and resources required are significantly reduced due to the smaller scale and faster testing cycle of the model.
Data Source
AI summary
The invention discloses a method for detecting service performance of a tunnel lining based on defect characteristics of the tunnel lining. A tunnel, an external load and stratum conditions are simulated by establishing a model using a model test method. A structural stress failure test for the model is carried out, and test results of the defect characteristics of a simulation lining of the model are recorded. A corresponding relationship between the defect characteristics of the simulation lining and the remaining bearing capacity interval is established according to the recorded test results. Detection results of defect characteristics of the tunnel lining are recorded using an in-situ detection method, and a remaining bearing capacity interval of the tunnel lining is determined based on the detection results according to the corresponding relationship between the defect characteristics of the simulation lining and the remaining bearing capacity interval of the model.