Research on radial stress distribution and gas seepage characteristics of the coal body around boreholes

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 ..., , # 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 m...,