Transition Support Parameter Design for Mixed Mining Faces
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Solution Overview
Problem
There is currently no accurate method for designing supporting parameters for the transition support in mixed mining faces that involve both filling and fully-mechanized mining, which affects the caving height and stress influence range of the transition section, posing a challenge for safe support design.
Innovation Solution
A method using 3DEC three-dimensional distinct element software to simulate and calculate the caving height and stress influence range based on varying filling rates, followed by curve fitting to establish functional relationships, allowing for the determination of supporting strength and number of transition supports through engineering geological parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If numerical simulation and curve fitting are used to establish functional relationships between filling rate and caving height/stress influence range, then measurement precision and manufacturing precision of supporting parameters are improved, but device complexity and calculation time increase
Solution Approach 1:
The patent performs preliminary numerical simulations to establish functional relationships between filling rate and caving height/stress influence range before actual supporting parameter design. By pre-calculating these relationships through 3DEC software and curve fitting, the complex numerical modeling is done in advance, allowing quick determination of supporting parameters during actual mining operations without repeating the full simulation process.
Solution Approach 2:
The patent introduces filling rate as an intermediary parameter that connects the complex numerical simulation results with practical supporting parameter design. The functional relationships established through curve fitting serve as intermediary models, translating complex simulation data into usable design criteria without requiring direct execution of full numerical models for each design scenario.
2Strength
If the filling rate is increased to control caving height and stress influence range, then the supporting strength requirements are reduced, but the filling capacity and equipment complexity increase
Solution Approach 1:
The patent systematically varies the filling rate parameter in numerical simulations to determine its impact on caving height and stress influence range. By changing this key parameter and establishing functional relationships, the method identifies optimal filling rates that balance supporting strength requirements with filling material quantity, allowing designers to select appropriate filling rates based on specific mining conditions rather than using fixed conservative values.
Data Source
AI summary
Disclosed is a method for designing supporting parameters of a transition support for a mixed mining face of filling and fully-mechanized mining. The method includes: first, determining a total length of a mixed mining working face and a length of a filling section according to requirements of a coal mining production capacity of the mixed mining working face and a filling capacity of the filling section working face; then, establishing a mixed mining numerical model of filling and fully-mechanized mining by using three-dimensional distinct element software, and simulating and calculating a caving height of a roof of a transition section and a stress influence range of the transition section when a filling rate of a mined-out area of the filling section changes; based on a result of numerical simulation and calculation, performing curve fitting according to a correlation coefficient to obtain a functional relationship between the filling rate and the caving height and a functional relationship between the filling rate and the stress influence range of the transition section; and finally designing supporting parameters of a transition support in combination with actual engineering geological parameters. The method can provide a reference for supporting design of a support, and enables a smooth transition between a filling support and a fully-mechanized mining support for a mixed working face, thereby further enriching filling mining theories and expanding the application range of filling mining.