Shield Tunnel Freezing Solution Optimization via Hydro-Thermal Coupling
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Solution Overview
Problem
Existing shield tunnel reinforcement methods do not adequately optimize the freezing solution post-construction, leading to potential collapse and accidents due to insufficient analysis of temperature fields and seepage influence.
Innovation Solution
An optimization method involving numerical modeling with thermal convection and hydro-thermal coupling models to analyze temperature variation curves and seepage effects, allowing for the adjustment of freezing pipe arrangements and diameters to enhance soil reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing shield reinforcement solutions are optimized during construction process only, then construction control can be achieved, but post-construction safety cannot be ensured
Solution Approach 1:
The patent applies preliminary action by establishing evaluation criteria and optimization frameworks before construction completes. The method pre-defines evaluation indicators for reinforcement effectiveness and sets up the optimization pathway in advance, allowing post-construction optimization to proceed efficiently without delaying safety assessments.
Solution Approach 2:
The patent implements feedback by systematically evaluating actual construction data against design objectives after construction completes. The method collects field data, compares it with predicted performance, and uses this feedback to optimize the reinforcement solution, ensuring post-construction safety through continuous improvement based on actual performance.
2Reliability
If freezing solution is not optimized based on temperature field analysis, then construction process is simpler, but tunnel stability is compromised
Solution Approach 1:
The patent applies segmentation by dividing the complex temperature field analysis into distinct computational modules. The method separates thermal conduction calculations from hydro-thermal coupling calculations, allowing each module to be developed and validated independently before integration, thus managing complexity while ensuring tunnel stability.
Solution Approach 2:
The patent uses numerical modeling software as an intermediary between the physical freezing system and the analysis objectives. The computational models act as mediators that translate complex physical interactions into interpretable results, enabling optimization of tunnel stability without requiring direct complex experimental setups.
3Reliability
If seepage influence is not considered in temperature field analysis, then analysis process is simpler, but freezing solution effectiveness is reduced
Solution Approach 1:
The patent merges the hydrological analysis and thermal analysis into a unified hydro-thermal coupling model. By combining these previously separate analyses into one integrated framework, the method captures the interactive effects of seepage and temperature fields, improving freezing solution effectiveness while managing overall system complexity through unified modeling.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting thermal and hydraulic parameters based on their coupled interactions. The method modifies thermal conductivity, specific heat, and hydraulic conductivity parameters according to saturation and temperature conditions, allowing the model to accurately represent real-world behavior where seepage and temperature influence each other.
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
This method identifies and optimizes unreasonable parts in existing shield tunnel reinforcement, preventing collapse and accidents by improving the freezing solution, thus ensuring safer tunnel operations.
Implementation Method 1
The present invention provides an optimization method of shield tunnel starting end reinforcement solution, including: selecting an existing and completed shield tunnel as an optimization object; acquiring engineering data and the temperature variation curves of the thermometer holes in the tunnel; obtaining respectively the first temperature variation curve and the second temperature variation curve by constructing the numerical model with thermal convection and the hydro-thermal coupling numerical model
Implementation Method 2
obtaining respectively the first temperature variation curve and the second temperature variation curve by constructing the numerical model with thermal convection and the hydro-thermal coupling numerical model
Implementation Method 3
a phase transition reaction occurring at a soil mass temperature below −1° C.
Implementation Method 4
all-inclusive horizontal freezing method of an end soil mass reinforcement shield entry tunnel construction method
Data Source
AI summary
An optimization method of shield tunnel starting end reinforcement solution, which specifically includes the following steps: acquiring shield tunnel engineering data and temperature variation curves of thermometer holes; constructing a numerical model with thermal convection and a hydro-thermal coupling numerical model respectively according to the shield tunnel engineering data, wherein a first temperature variation curve and a second temperature variation curve can be obtained after carrying out numerical simulations on the above two models; the influence of seepage on the development law of a temperature field can be obtained by comparing and analyzing the temperature variation curves of the thermometer holes with the first and the second temperature variation curves; and finally the existing freezing solution of the shield tunnel is optimized according to the influence of the seepage on the development law of the temperature field, to ensure safe use of the shield tunnel.