单一厚煤层工作面采动影响下煤体渗透特性研究  

Study on permeability characteristics of coal body under mining influence in working face of single thick coal seam

作　　者：元继光 崔崇斌 陈巧军 王朝乾 Yuan Jiguang;Cui Chongbin;Chen Qiaojun;Wang Chaoqian(Malan Coal Mine,Shanxi Coking Coal Xishan Coal Electricity Co.,Ltd.,Taiyuan 030200,China;School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]山西西山煤电股份有限公司马兰煤矿,山西太原030200 [2]中国矿业大学安全工程学院,江苏徐州221116

出　　处：《煤炭科技》2025年第2期58-65,共8页Coal Science & Technology Magazine

基　　金：国家自然科学基金项目(52074283)。

摘　　要：为深入揭示采动作用对煤体渗透特性的影响,以马兰煤矿8号煤层(单一厚煤层)为研究对象,系统开展了不同围压与孔隙水压条件下煤体的常规三轴加载渗流实验,全面探讨采动影响下煤体渗透特性的演化规律及其力学响应机制。研究结果表明:围压增加使煤体强度提高,破坏时渗透率峰值降低;孔隙水压增加则降低煤体强度,破坏时渗透率峰值升高。基于应力变化速率设计了三轴分段加卸载实验路径。实验发现:在缓慢升压区,煤体应力由10.45 MPa升至11.68 MPa,裂隙闭合导致渗透率非线性下降至0.16×10^(-3)μm^(2);急速升压区,煤体应力升至19.24 MPa,渗透率先降低后非线性增加至0.42×10^(-3)μm^(2);快速降压区,煤体应力骤降,体积膨胀显著,渗透率持续升高至0.87×10^(-3)μm^(2)。基于实验数据拟合得出了采动影响下煤体渗透率与轴向应力的关系公式,研究结果为煤层采动区渗流特性研究提供科学的理论依据。In order to deeply reveal the influence of mining action on the permeability characteristics of the coal body,the conventional triaxial loading seepage experiments of the coal body under different conditions of confining pressure and pore water pressure were carried out systematically with the No.8 coal seam(a single thick seam)of Malan Mine as the object of the study,and the evolution law of the permeability characteristics of the coal body under the influence of mining was comprehensively explored,as well as the mechanism of its mechanical response.The results show that the increase of the confining pressure increases the strength of the coal body,and the peak permeability decreases at the time of damage;the increase of the pore water pressure decreases the strength of the coal body,and the peak permeability increases at the time of damage.Based on the rate of stress change,a triaxial segmented loading and unloading experimental path was designed.It was found that in the slow pressurization zone,the coal body stress increased from 10.45 MPa to 11.68 MPa,and the permeability decreased nonlinearly to 0.16×10^(-3)μm^(2)due to the closure of fissures;in the rapid pressurization zone,the coal body stress increased to 19.24 MPa,and the permeability decreased firstly and then increased nonlinearly to 0.42×10^(-3)μm^(2);in the rapid depressurization zone,the coal body stress dropped suddenly,and the volume expansion was significant,and the permeability continued to increase to 0.87×10^(-3)μm^(2).0.87×10^(-3)μm^(2).Based on the experimental data,the relationship between the permeability and axial stress of the coal body under the influence of mining was fitted,the results of this study can provide a scientific theoretical basis for the study of permeability characteristics in the coal seam mining area.

关 键 词：采动影响 渗透特性 围压 孔隙水压 渗透率 

分 类 号：TD712[矿业工程—矿井通风与安全]