DOI: 10.5061/dryad.j0zpc86v5
title: Data from: Research on radial stress distribution and gas seepage characteristics of the coal body around boreholes

description: Addressing the complex issues of elastic-plastic deformation in the coal
 body around boreholes (CBAB) and gas seepage during gas extraction, this
 study quantitatively reveals the radial stress distribution
 characteristics of CBAB based on Mohr-Coulomb strength criteria through
 postdrilling stress analysis of the surrounding coal body. Radial seepage
 experiments were simulated, and combined with experimental results, the
 gas seepage characteristics of CBAB were systematically analyzed,
 validating the permeability evolution model. The findings indicate that
 CBAB radially divides into a decompression zone, a stress concentration
 zone, and a native rock stress zone. Vertical stress first peaks then
 decays, while horizontal stress continuously decreases. Radial segmented
 permeability experiments demonstrate that CBAB permeability initially
 drops sharply due to pore compaction, then undergoes a gradual change
 dominated by microfractures, eventually stabilizing under rigid matrix
 control. The calculated results of the CBAB radial permeability evolution
 model exhibit an R2 &gt; 0.95 correlation with experimental flow data.
description: # FLAC3D Simulation Data of Coal Body Around Boreholes ## Summary This
 dataset contains processed FLAC3D simulation data for analyzing radial
 stress distribution and gas seepage characteristics of coal bodies around
 boreholes. The dataset includes a text file with simulation results and a
 README for interpreting the data. ## File Structure | File Name | Type |
 Description | | ------------------ | -------- |
 ------------------------------------------------------------------------------------------------- | | `FLAC3D_data.txt` | Text | Processed FLAC3D simulation data. Can be opened with any text editor for analysis or replication. | | `README_FLAC3D.md` | Markdown | This README file describes the dataset, file contents, variables, and usage instructions. | ## Variables and Units * Stress variables: `xx`, `yy`, `zz` in Pascals (Pa) * Material properties: * `bul` = bulk modulus (Pa) * `shea` = shear modulus (Pa) * `cohesion` = cohesion (Pa) * `friction`, `dilation` = angles in degrees * `tension` = tensile strength (Pa) * `density` = kg/m³ * Displacement and velocity in meters (m) and meters per second (m/s) * Other variables follow standard FLAC3D conventions ## Usage Instructions * Open `FLAC3D_data.txt` with any text editor or analysis software (Excel, Python, R, etc.). * The file contains processed simulation results derived from the original FLAC3D model. * Users can analyze the data for stress distribution, gas seepage behavior, or other post-processing tasks. ## Additional Notes * This dataset does not include the original FLAC3D input script. * The processed data is sufficient for analysis and replication of the results presented in the associated study. * This README file is provided to facilitate reuse, replication, and further analysis. ## Citation We request citing this Dryad dataset when using this file or its data in any research publication.