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Discrete element method for simulating roadway surrounding rock fracture evolution

A fracture evolution, discrete element technology, applied in design optimization/simulation, CAD numerical modeling, testing material strength using applied stable tension/pressure, etc. Guiding on-site construction, deviation and other issues to achieve the effect of strong on-site guiding significance and real and reliable simulation results

Active Publication Date: 2019-10-29
CHINA UNIV OF MINING & TECH +1
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Problems solved by technology

[0004] The existing numerical simulation methods and technologies exist when simulating roadway deformation: the selection of rock mass mechanical parameters in the model is to directly apply the mechanical parameters measured in the laboratory to the numerical model; and because the samples used in the laboratory are usually small , the sample is formed from the original rock after mining and cutting. During this process, the internal stress and structure change, so there is a big difference compared with the real large-scale rock mass; the existing numerical simulation methods and technologies ignore The difference between the large-scale engineering rock mass and the small-scale rock block is not clear, and the final result has a large deviation from the actual site, lacks credibility, and cannot guide the site construction

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  • Discrete element method for simulating roadway surrounding rock fracture evolution
  • Discrete element method for simulating roadway surrounding rock fracture evolution
  • Discrete element method for simulating roadway surrounding rock fracture evolution

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Embodiment Construction

[0042] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be noted that the following examples are only used to illustrate the present invention, and do not limit the present invention.

[0043] Example Taking the gob-side excavation of the 7m narrow coal pillar in the 15106 return airway of Sijiazhuang Mine of Yangmei Group as the engineering background, the average buried depth of the coal seam is 574m, the average thickness is 5.5m, and the joints and fissures are developed. The total length of the 15106 return airway is 1700m. The roadway is excavated along the roof of the coal seam, and the excavation section is rectangular width × height: 4.8m × 4.0m. The columnar diagram of the coal seam is as follows figure 1 shown. The method of the present invention is now used to correct the parameters of the numerical model for simulating deformation along the roadway. In this example, the discr...

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Abstract

The invention discloses a discrete element method for simulating roadway surrounding rock fracture evolution. The discrete element method comprises the steps that on-site coal and rock stratum coringis conducted an RQD value is recorded, roadway deformation is observed, and coal seam fracture distribution characteristics are counted; mechanical parameters of coal rock samples are tested indoors,and the strength of the rock mass is calculated according to the RQD value; a UDEC-Trigon module is used for establishing a numerical model to adjust parameters, and parameters match with rock mass strength to correct model parameters; and a numerical model of the engineering scale is established to adjust the parameters to be matched with field deformation characteristics, and finally roadway surrounding rock fracture evolution is simulated. Accurate basic mechanical parameters are provided for discrete element numerical simulation roadway deformation, and it can be ensured that the simulation result is real and reliable.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a discrete element method for simulating the crack evolution of roadway surrounding rock. Background technique [0002] The stability of coal pillars has always been the focus of research for safe and efficient mining. With the increase of mining depth, the geological conditions are complex, large deformation occurs along the goaf roadway, gas leakage in the gob area, etc., and the control effect of the surrounding rock of the roadway is poor. The unreasonable width of coal pillars and the unclear understanding of the failure mechanism of coal pillars and surrounding rocks lead to the inability to propose long-term and effective control measures, seriously affecting the safe and efficient mining of coal resources. [0003] Numerical simulation methods have obvious advantages in solving engineering problems, mainly including finite element and discrete element met...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G01N3/08
CPCG01N3/08G01N2203/0017G01N2203/0019G06F2119/06G06F30/20G01N33/24G06F30/23G06F30/25G01N2203/0218G06F2111/10
Inventor 王襄禹吴文达柏建彪夏军武吴博文刘帅刚闫帅
Owner CHINA UNIV OF MINING & TECH
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