围岩-水压耦合作用下煤岩渗流特性演化规律  

Evolution law of coal rock seepage characteristics under the coupling effect of surrounding rock and water pressure

作　　者：李伟 张博成 康健 杨逾[2] LI Wei;ZHANG Bocheng;KANG Jian;YANG Yu(Guoneng Shendong Coal Group Limited Company,Ordos 017000,China;School of Civil Engineering,Liaoning Technical University,Fuxin 123000,China)

机构地区：[1]国能神东煤炭集团有限责任公司,内蒙古鄂尔多斯017000 [2]辽宁工程技术大学土木工程学院,辽宁阜新123000

出　　处：《辽宁工程技术大学学报(自然科学版)》2025年第1期1-7,共7页Journal of Liaoning Technical University (Natural Science)

基　　金：国家重点研发计划资助项目(2018YFC0604705);国家自然科学基金项目(51774167);辽宁省重点实验室资助项目(LJZS002)。

摘　　要：为探究煤体在不同围压及水力荷载下渗流规律,利用SEM微观扫描图像及二值化分析系统,基于孔裂隙分形特征模型,模拟计算煤岩内部孔隙度及静态渗透率,并通过GDS-DYNTTS型软岩流变仪,开展不同水压-围压耦合场下动态渗流试验。研究结果表明:基于微观结构图像及渗透率模型,利用合理分形维度,可得到较真实的静态渗透率;双场耦合中固定水压不同围压条件下,煤体具备3个不同的渗流阶段:孔隙受压闭合期、孔隙变形缓释期及孔隙变形快速恢复期,当围压高于6MPa时,渗透率对水压敏感度较低,低于4MPa时,渗透率随着水压增大呈指数增长;双场动态耦合下,煤体渗透率整体变化趋势出现平台期及急增期2个明显特征。研究结果可为开采卸压后煤层涌水路径、水量估算及突水风险预测提供参考。To investigate the permeability characteristics of coal under different confining pressures and hydraulic loads,SEM micro-scan images and a binary analysis system were used.Based on the fractal characteristics of pore and fracture networks,a model was developed to simulate the porosity and static permeability of the coal rock.Dynamic permeability tests under different water pressures and confining pressures were conducted using a GDS-DYNTTS soft rock rheometer.The research results show that by using reasonable fractal dimensions based on the microstructure images and permeability model,realistic static permeability values can be obtained.Under the coupling of fixed water pressure and different confining pressures,the coal exhibite three different stages of permeability:the stage of pore compression closure,the stage of slow pore deformation release,and the stage of rapid pore deformation recovery.When the confining pressure exceeds 6 MPa,the sensitivity of permeability to water pressure was relatively low.However,when the confining pressure was below 4 MPa,the permeability increase exponentially with increasing water pressure.Under dynamic coupling conditions,the overall trend of coal permeability showed two distinct features:a plateau period and a rapid increase period.The research results provide references for understanding water inflow paths,estimating water quantities in coal seams after mining-induced stress relief,and predicting water inrush risks.

关 键 词：煤岩渗流特性 孔裂隙结构 渗流水压 卸压 渗透率 

分 类 号：TD315[矿业工程—矿井建设]