采矿与岩层控制工程学报2024，Vol.6Issue(2)：1-12,12.
水力耦合作用下煤岩渗流动态演化规律
Dynamic evolution law of coal seepage under hydraulic coupling
吕明杰 1刘立仁 1张小涛 2陈博1
作者信息
- 1. 陕西德源府谷能源有限公司 三道沟煤矿, 陕西 府谷 719400
- 2. 中煤科工集团重庆研究院有限公司, 重庆 400037
- 折叠
摘要
Abstract
To elucidate the dynamics of water seepage within coal matrices during coal seam water injection,this research integrates laboratory experiments with numerical simulations.Experiments were conducted to examine the deformation of coal structures and the evolution of permeability under the dual effects of geostress and pore water pressure coupling.A mathematical model for the evolution of volume deformation under hydraulic coupling was formulated,followed by dynamic numerical simulations of water injection seepage in coal using secondary development with User-Defined Functions(UDF).The findings reveal that porosity changes in the coal rock are jointly influenced by stress and water pressure,with coal rock axial deformation and water pressure distribution showing a progressive decrease from top to bottom.Volume deformation correlates positively with axial load and the magnitude of pore water pressure.Pore water pressure acts as the driving force for the permeation of free wa-ter within pores and fractures,also affecting the coal matrix's mechanical integrity,with increased water pressure facilitating matrix damage.Utilizing UDF to fit the porosity changes against pore water pressure based on perme-ability test results yielded simulations closely aligned with experimental observations,demonstrating minimal discrepancies.This approach,leveraging Fluent for dynamic simulation of fluid-solid coupling experiments,of-fers valuable insights into the seepage behavior of coal.关键词
煤层注水/渗流/UDF/孔隙率/流固耦合/数值模拟Key words
coal seam water injection/seepage/UDF/porosity/fluid-structure coupling/numerical simulation分类
矿业与冶金引用本文复制引用
吕明杰,刘立仁,张小涛,陈博..水力耦合作用下煤岩渗流动态演化规律[J].采矿与岩层控制工程学报,2024,6(2):1-12,12.
