3D Stratum Reinforcement Modeling for Shield Tunnel Settlement Control
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Solution Overview
Problem
The conventional methods for shield tunneling across existing structures in urban rail transit construction are costly, time-consuming, and pose significant safety risks, necessitating improved stratum reinforcement and protection techniques.
Innovation Solution
A numerical simulation method for stratum reinforcement involving geological data acquisition, 3D modeling, mesh generation, and synchronous grouting simulation to analyze and optimize reinforcement schemes for shield tunnel construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods (vertical shafts, horizontal freezing, grouting reinforcement, manual tunneling) are used to cross existing structures, then construction safety is improved, but construction cost increases and construction period extends
Solution Approach 1:
The patent replaces manual tunneling with shield tunneling technology, using a mechanical shield tunneling machine to bore through the ground and existing structures. This substitution of manual labor with automated mechanical equipment enables faster construction while maintaining safety through controlled mechanical operations, directly resolving the contradiction between construction safety and construction period
Solution Approach 2:
The patent applies preliminary stratum reinforcement before shield tunneling to stabilize the ground conditions. By performing grouting reinforcement and other preparatory measures in advance, the construction process avoids delays during tunneling, ensuring both safety and efficient construction timing
2Productivity
If shield tunneling is used to cross existing structures, then construction period is shortened and cost is reduced, but stratum reinforcement difficulty increases and protection requirements are raised
Solution Approach 1:
The patent uses numerical simulation to determine optimal reinforcement parameters such as grouting pressure, reinforcement depth, and material composition. By calculating and adjusting these parameters based on geological conditions and tunnel requirements, the complexity of stratum reinforcement is managed systematically, enabling high construction speed without compromising safety
Solution Approach 2:
The patent incorporates numerical simulation and monitoring feedback to continuously adjust stratum reinforcement strategies. Simulation results provide feedback on reinforcement effectiveness, allowing real-time optimization of construction parameters to maintain both high productivity and appropriate reinforcement complexity
3Manufacturing precision
If numerical simulation method is applied for stratum reinforcement, then reinforcement scheme optimization is improved, but modeling complexity and computational requirements increase
Solution Approach 1:
The patent divides the complex tunneling project into separate modeling modules: geological condition modeling, stratum reinforcement modeling, shield tunneling modeling, and existing structure protection modeling. This segmentation allows each module to be developed and optimized independently, reducing overall modeling complexity while maintaining high optimization precision through integrated analysis
Solution Approach 2:
The patent creates a virtual numerical model that replicates the physical tunneling process and stratum reinforcement conditions. This digital copy allows repeated simulation and optimization without physical trial-and-error, achieving high precision reinforcement scheme optimization while managing computational complexity through efficient modeling techniques
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 provides accurate and efficient visualization of tunnel boring machine construction, enabling effective settlement control and deformation mitigation, thereby guiding rational reinforcement strategies for safer and more economical tunneling.
Implementation Method 1
performing synchronous grouting simulation on the 3D model; changing stratum parameters to achieve stratum reinforcement modeling
Implementation Method 2
improving the deformation and stress characteristics of existing structures
Implementation Method 3
improving the deformation and stress characteristics of existing structures
Data Source
AI summary
A stratum reinforcement modeling and analysis method for a shield tunnel crossing an existing structure is provided. Geological information and an engineering structure condition of the existing structure are acquired. Physical parameters of different soil mass layers are determined based on a laboratory test. A three-dimensional (3D) model is constructed. Mesh generation is performed on the 3D model defining a constraint for the 3D model. Model parameters are selected for the 3D model. A soil mass constitutive model is selected for the 3D model. Synchronous grouting simulation, construction load simulation and shield tunneling construction simulation are performed on the 3D model. Stratum parameters are changed to achieve stratum reinforcement modeling. Data analysis is performed by adopting different reinforcement schemes to achieve stratum reinforcement modeling and numerical analysis of the process of the shield tunnel crossing the existing structure.