4.3 Article

Simulation of coal microstructure characteristics under temperature-pressure coupling based on micro-computer tomography

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.jngse.2021.103906

关键词

Coal structure; Micro-computer tomography; Temperature-pressure coupling; Fractal

资金

  1. National Natural Science Foundation of China [51934004, 51674158]
  2. Outstanding youth fund of Shandong Natural Science Foundation [ZR2020JQ22]
  3. Major Program of Shandong Province Natural Science Foundation [ZR2018ZA0602]
  4. Science and technology support plan for Youth Innovation of colleges and universities in Shandong Province [2019KJH006]
  5. Taishan scholar project [TS20190935]

向作者/读者索取更多资源

This study investigates the pore-fracture structure of coal under temperature-pressure coupling conditions by constructing six different coal structure models and using a boxcounting algorithm to calculate fractal dimensions. The research reveals a positive correlation between porosity and fractal dimension, and the deformation trend shows a pattern of first decreasing and then increasing with increasing porosity and fractal dimension.
The distribution of pore-fracture structure in coal directly affects the storage and migration characteristics of fluids. Simultaneously, under the condition of high buried depth, the coal structure is further changed by the temperature-pressure coupling. To study the pore size distribution of coal and the deformation characteristics of different pore-fracture structures under temperature-pressure coupling conditions, six different coal structure models are constructed using three-dimensional computer tomography reconstruction in this work. The boxcounting algorithm is used to calculate the fractal dimensions of the pore-fracture structure and pore clusters in different pore sizes of coal. In the meantime, the fractal characteristics of the pore structure in different pore sizes are analyzed. Based on the coal structure model, a linear elastic deformation model under the temperature-pressure coupling is constructed. Moreover, the relationship of porosity and fractal dimension with the deformation of models is studied. The research results show that the porosity positively correlated with fractal dimension. The changes of pore volume fraction and fractal dimension in each pore size distribution range are consistent. Under the temperature-pressure coupling condition, both the model porosity and fractal dimension exhibit a quadratic function relationship with deformation. The deformation analysis of the three-dimensional models and two-dimensional cross-sections show that as the porosity and fractal dimension increase, the coal body deformation exhibits a trend of first decreasing and subsequent increasing. Low fractal dimension and high porosity could increase the model deformation. The research results can afford a theoretical basis for the study of coal structure characteristics under complex conditions.

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