Shaft Boring Simulation With Segmental Support Modeling
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Solution Overview
Problem
Current construction simulation methods for shaft boring machines are inaccurate and cumbersome, failing to adequately address the challenges of nonlinear instability and deformation in deep shaft excavation, particularly in weak rock strata with low strength and high porosity, which complicates the optimization of construction schemes.
Innovation Solution
A method utilizing a finite element numerical simulation platform to construct a numerical model of the boring machine and surrounding rock, simulating the boring process segment by segment with support structure modeling, and evaluating the support effect to determine the factor of safety for optimizing the construction process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional construction simulation methods are used, then the simulation process is simple to implement, but the simulation accuracy is low and the results are not reliable
Solution Approach 1:
The construction process is divided into multiple excavation segments, with each segment simulated separately. The boring machine advances axially segment by segment with a predetermined advancing distance, allowing detailed simulation of each stage while maintaining overall process manageability
Solution Approach 2:
Support structure models are constructed in advance based on the current support scheme before simulating each excavation segment. This preliminary preparation ensures that support effects are accurately captured without adding complexity to the simulation execution
Solution Approach 3:
The patent replaces conventional simplified simulation methods with finite element numerical simulation. This substitution introduces detailed mechanical modeling of the boring machine, surrounding rock, and support structures, significantly improving simulation accuracy despite increased computational complexity
2Reliability
If detailed numerical modeling is implemented, then simulation accuracy improves, but the simulation becomes cumbersome and time-consuming
Solution Approach 1:
The excavation process is segmented into discrete advancement stages, allowing the simulation to progress through manageable intervals. Each segment can be simulated with high detail while the overall process remains organized and time-efficient
Solution Approach 2:
The simulation follows a periodic cycle of excavation segment advancement followed by support structure construction. This rhythmic progression through standardized phases improves computational efficiency while maintaining reliability
Solution Approach 3:
The simulation dynamically updates parameters such as boring thrust, support forces, and rock stress states at each excavation segment. These parameter changes are systematically managed to ensure accuracy without excessive computational burden
Data Source
AI summary
A method for simulating construction of a shaft boring machine, a device, a medium, and a product are provided The method includes: constructing a numerical model for construction simulation by using a finite element numerical simulation platform; configuring interaction simulation parameters, boundary conditions and an initial state of the numerical model for construction simulation; simulating a boring process of the boring machine that advances axially segment by segment with a predetermined advancing distance in the parameter-configured numerical model for construction simulation; at the end of each segment of advancement, constructing a support structure model on an exposed surrounding rock contact surface of a current advancement segment based on a current support scheme; and at the end of each segment of advancement, simulating a support effect of the support structure based on the support structure model to obtain a simulation result.