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A Finite Element Optimization Method for Protecting the Width of Coal Pillars in Floor Roadway

A technology for protecting coal pillars and optimizing methods, applied in the field of floor roadway protection of coal pillar width and finite element optimization, can solve the problems of reduced analysis efficiency, easy to ignore optimal solutions, impossible to establish all solutions, etc., to improve analysis efficiency Effect

Active Publication Date: 2022-05-17
SHANDONG UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

However, in the analysis process, there must be repetitive modeling and alternative selection judgment problems, which greatly reduces the analysis efficiency. At the same time, it is impossible to establish all alternatives during the model building process, so the optimal alternative is easily overlooked

Method used

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  • A Finite Element Optimization Method for Protecting the Width of Coal Pillars in Floor Roadway
  • A Finite Element Optimization Method for Protecting the Width of Coal Pillars in Floor Roadway
  • A Finite Element Optimization Method for Protecting the Width of Coal Pillars in Floor Roadway

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Embodiment

[0052] The floor strata of the 42010 working face of a coal mine project are dominated by siltstone, and the floor roadway is located 26m below the coal seam, with a buried depth of 610m. The roadway adopts a straight wall semi-circular arch section with a clear width of 5000mm and a clear height of 6800mm. The roadway is supported by anchor spraying and the concrete thickness is 200mm. In the roadway excavation, the anchor cable support parameters are φ22mm×7500mm, and the row spacing is 1200mm×1200mm. The bottom plate adopts φ22mm×8300mm high-strength steel strand anchor cables, and the row spacing is 1300mm×1300mm.

[0053] Columnar distribution of rock formations such as Figure 4 As shown, the support section is as Figure 5 shown.

[0054] Using the standard design language Python of the large-scale finite element software ABAQUS to compile a parametric variable model capable of simulating different reserved coal pillar widths, such as figure 1 As shown, in order to r...

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Abstract

The invention discloses a finite element optimization method for the width of the protective coal pillar of the floor roadway, which includes: calling a dynamic parameterized model program, modifying the width L of the protective coal pillar to perform finite element calculation; using the program Disp.py to obtain key point deformation, and calculate The total objective function U; use the program CoalwidthOp.m to automatically optimize the total objective function; when the optimization iterative calculation satisfies the constraints on the width of the protected coal pillar, the optimization result is output, and if it is not satisfied, return to recalculation. The present invention is based on the ABAQUS platform, uses the Python language to establish a dynamic parameterized model for simulating the width of different protected coal pillars, compiles a finite element optimization analysis calculation program based on the Matlab language, and takes the minimum shape of the roadway and the protected coal pillar deformation as the optimization target. Calculating with a dynamic parametric model, a reasonable size of the protective coal pillar is obtained, which improves the analysis efficiency of determining the width of the protective coal pillar in the floor roadway by using the finite element method, and provides theoretical support for the design of the protective coal pillar under similar mining conditions.

Description

technical field [0001] The invention relates to the field of coal mining, in particular to a finite element optimization method for protecting the width of a coal pillar in a floor roadway. Background technique [0002] Reasonable protection of the width of coal pillars is very important for maintaining the stability of roadways and working faces and improving the mining rate of coal resources. At present, some coal mines in my country still adopt the traditional retaining method, that is, relying on experience to determine the width of coal pillars. Generally, large-sized protective coal pillars are reserved on the basis of regardless of cost. It has a protective effect, but causes a lot of waste of coal resources. How to reasonably determine the coal pillar width while taking into account the resource recovery rate and roadway stability has always been the focus of many scholars. [0003] Xi Jiami proposed a method of combining on-site measurement and numerical simulation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23
CPCG06F30/23
Inventor 王辉战玉宝郑朋强李楠
Owner SHANDONG UNIV OF SCI & TECH
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