离散元数值模拟参数设置数学模型

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS
Song Qin, Haifei Lin, Shouguo Yang, Zongyong Wei
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引用次数: 0

摘要

为了合理设置陡倾斜煤层开采模拟中的接头参数、模型尺寸和垂直应力初始值,采用了离散元数值模拟的故障树分析方法,并提出了数学模型。在前人工作的基础上,获得了消除尺寸效应误差对煤样和岩样参数影响的方法。此外,建立了节理不连续面的构成方程和特征值确定公式,提出了节理参数的确定方法,形成了数值模拟参数间完整的 "耦合链"。此外,通过元素体的压缩和剪切模型,构建了垂直应力初始值公式。此外,还通过断裂力学的强度因子分析确定了最小尺寸。以研究文献为例,计算了模型尺寸和垂直应力初始值。在此基础上,直接利用煤样物理参数、考虑尺寸效应影响的煤岩物理参数和考虑尺寸效应影响的煤岩节理参数计算结果,对位移场和应力场进行对比分析,从而验证了数学模型的合理性和正确性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A mathematical model for parameter setting in discrete element numerical simulation

A mathematical model for parameter setting in discrete element numerical simulation

To rationalize the setting of joint parameters, model size, and initial value of vertical stress in simulation of mining of steeply inclined coal seams, a fault tree analysis method of discrete element numerical simulation was used and a mathematical model was proposed. A method of eliminating the influences of size-effect errors on the parameters of coal and rock samples was obtained based on previous work. Furthermore, the constitutive equation and eigenvalue determination formula of a joint discontinuity surface were established, and a method of determination of the joint parameters was proposed, forming the complete “coupling chain” between parameters for numerical simulation. In addition, a formula for the initial value of vertical stress was constructed by way of the compression and shear model of the element body. Also, the minimum dimension was determined by means of strength factor analysis of fracture mechanics. Taking the research literature as an example, the model size and initial value of vertical stress were calculated. On this basis, the physical parameters of coal samples, the physical parameters of coal rocks considering the influence of the size effect and the calculated coal rock joint parameters considering the influence of size effect were directly used to comparatively analyze the displacement and stress fields, thus verifying the reasonability and correctness of the mathematical model.

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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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