煤田地质与勘探2025，Vol.53Issue(7)：154-165,12.DOI:10.12363/issn.1001-1986.25.03.0186
渗流-应力耦合下断层带裂隙岩体渗透演化规律
Permeability evolutionary patterns of fractured rock masses in fault zones under seepage-stress coupling
摘要
Abstract
[Background]In coal mines,fault structures serve as critical pathways for water inrushes from coal seam floors,posing serious threats to the production safety of mines.Delving into the permeability evolutionary patterns of fractured rock masses in fault zones under seepage-stress coupling holds great significance for the prevention and con-trol of water inrushes along faults from coal seam floors.[Methods]Against the engineering background of the Gaohe Coal Mine under the Shanxi Lu'an Mining(Group)Co.,Ltd.in Shanxi Province,this study analyzed the microscopic physical properties and the pore and fracture structures of a fractured rock mass in a fault zone initially.Then,using tri-axial seepage tests,this study investigated the permeability evolutionary patterns of the fractured rock mass under cyclic loading and unloading,establishing the quantitative coupling relationship between the permeability coefficient and the confining pressure.Finally,based on the mechanical model analysis,this study constructed a numerical model for water inrushes along fault Fw159 in the Gaohe Coal Mine.Accordingly,the formation and evolution patterns of pathways for water inrushes from coal seam floors were analyzed.[Results and Conclusions]The pores and fractures in the frac-tured rock mass of the fault zone exhibited complex structures,rough edges,and non-directional development micro-scopically,and these characteristics governed the permeability of the rock mass.A negative exponential relationship was observed between the permeability coefficient and the confining pressure,with the variations in the seepage pressure playing a significant role in the displacement of the fractured zone in the floor and the formation of hydraulically con-ductive pathways.During coal mining,stress disturbance preceded the displacement effect,which became gradually pro-nounced after mining-induced stress peaked.As pore water pressure reached 3 MPa,confined water accumulated at the bottom of fault Fw159,migrating upward along the fractured zone of the fault until instability failure occurred.The res-ults of this study reveal the inherent relationships between the permeability characteristics of fractured rock masses in fault zones and the water inrushes along faults from coal seam floors in coal mines,providing a theoretical basis for the prevention and control of water inrushes from coal seam floors and safe mining in coal mines.关键词
底板水害/裂隙岩体/渗流失稳/断层突水/流固耦合/潞安高河煤矿Key words
water hazard from floors/fractured rock mass/seepage-induced instability/fault-induced water inrush/fluid-structure interaction/Gaohe Coal Mine of Shanxi Lu'an Mining(Group)Co.,Ltd.分类
矿业与冶金引用本文复制引用
赵德康,韩冰,曾一凡,冯国瑞,席永红,常波峰,李政昊,王鹏威,王立三..渗流-应力耦合下断层带裂隙岩体渗透演化规律[J].煤田地质与勘探,2025,53(7):154-165,12.基金项目
国家自然科学基金青年基金项目(A类延续资助)(52525401) （A类延续资助）
博士后特别项目(2024T171050) （2024T171050）
国家自然科学基金联合基金项目(U24A20616) （U24A20616）
国家自然科学基金重点项目(52334005) （52334005）
山西省基础研究计划项目(20210302124482) （20210302124482）
