不同循环加卸载路径含瓦斯煤体变形-渗流特征  

Deformation-seepage characteristics of gas-bearing coal under different cyclic loading and unloading paths

作　　者：易恩兵 Yi Enbing(CCTEG Chongqing Research Institute,Chongqing 400039,China;State Key Laboratory of Coal Mine Disaster Prevention and Control,Chongqing 400039,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]中煤科工集团重庆研究院有限公司,重庆400039 [2]煤矿灾害防控全国重点实验室,重庆400039 [3]河南理工大学能源科学与工程学院,河南焦作454000

出　　处：《能源与环保》2025年第2期1-8,共8页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：国家自然科学基金面上项目(52174073)。

摘　　要：为研究煤体在重复扰动作用下的变形规律及瓦斯渗流特征,设计了3种不同循环加卸载路径试验,通过理论分析和实验室试验,掌握了煤体内部渗流场演化规律。基于单元体建立流体运移方程和Kozeny-Carman模型,得到含瓦斯煤体渗透率演化方程。结果表明,煤样三轴压缩破坏强度可达45 MPa,煤岩循环加卸载破坏过程分为孔隙压密、弹性、屈服和破坏4个阶段。循环加卸载峰前阶段,应力加载使渗透通道收缩或封闭,渗透率降低;屈服阶段后,通道开启,渗透率及增长速率上升;峰后阶段,轴压与围压越大,渗透率越小。随循环次数增加,渗透率增幅扩大,呈周期性变化;当超过极限疲劳强度时,渗透率再次下降。该结果对沙曲矿区瓦斯治理有借鉴意义,可为工程设计提供理论支撑。In order to study the deformation law and gas seepage characteristics of the coal under repeated disturbances,three different cyclic loading and unloading path tests were designed,and the evolution law of the seepage field inside the coal was grasped through theoretical analysis and laboratory tests.Based on the unit cell,the fluid transport equation and Kozeny Carman model was established to obtain the permeability evolution equation of gas containing coal.The results show that the triaxial compressive damage strength of the coal samples can reach 45 MPa,and the cyclic loading and unloading damage process of the coal rock can be divided into four stages:pore compaction,elasticity,yielding and destruction.In the pre-peak stage of cyclic loading and unloading,the permeable channels were contracted or closed by stress loading,and the permeability decreased;after the yielding stage,the channels were opened,and the permeability and growth rate increased;in the post-peak stage,the higher the axial and peripheral pressures were,the smaller the permeability was.As the number of cycles increases,the permeability growth rate expands and shows cyclic changes;when the ultimate fatigue strength is exceeded,the permeability decreases again.The results of the study can help the gas management of Shaqu Coal Mine and provide theoretical support for the design of engineering technology.

关 键 词：循环加卸载 应力路径 含瓦斯煤体 渗透率 

分 类 号：TD712[矿业工程—矿井通风与安全]