采动应力下深部煤体渗透率演化规律研究  

Permeability evolution of deep coal under mining stress

作　　者：荣腾龙 刘克柳 周宏伟[3,4] 关灿 陈岩[1,2] 任伟光 RONG Teng-long;LIU Ke-liu;ZHOU Hong-wei;GUAN Can;CHEN Yan;REN Wei-guang(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China;Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization,Jiaozuo 454003,China;School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology(Beijing),Beijing 100083,China;School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454003 [2]煤炭安全生产与清洁高效利用省部共建协同创新中心,河南焦作454003 [3]中国矿业大学(北京)能源与矿业学院,北京100083 [4]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083 [5]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《岩土工程学报》2022年第6期1106-1114,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(52004081,51904092,52174175);河南省高等学校重点科研项目(21A440005);河南理工大学博士基金项目(B2020-34)。

摘　　要：为了研究深部开采工作面前方煤体的渗透属性,首先基于典型开采方式应力路径进行了不同瓦斯压力下的深部煤体渗透率测试,然后根据渗透率升降速率和单调性对渗透率的演化过程进行划分,归纳出常规三轴加载和采动应力下煤体渗透率演化过程概化模型,最后结合三向扰动应力下的深部煤体渗透率模型与二次多项式拟合关系建立了深部采动煤体全应力–应变渗透率理论模型。结果表明:典型开采方式采动应力路径下深部煤体的应力–应变曲线不存在压密阶段;峰值应力之前和之后测点的渗透率增加率上升幅度较小,而峰值点的渗透率增加率上升幅度较大;常规三轴加载的煤体渗透率曲线呈“V”字形,相应的概化模型包括下降段、峰前缓升段、急升段和峰后缓升段;采动应力下的深部煤体渗透率曲线呈倒“Z”字台阶形,相应的概化模型可划分为峰前缓升段、急升段和峰后缓升段;建立的渗透率理论模型能够表征不同开采方式下深部煤体全应力–应变过程的渗透率演化。In order to investigate its seepage properties,the permeability of the coal in front of deep working face under different gas pressures is tested based on the mining stress path of typical mining layouts.Subsequently,the permeability evolution is divided according to the rate and monotonicity of permeability variation.Two conceptual permeability models for the coal under different stress paths are obtained.One is about the conventional triaxial loading,and the other is about the mining stress path.Moreover,according to the permeability model for deep coal under triaxial disturbance stress and the quadratic polynomial fitting relationship,a theoretical permeability model for the deep coal in complete stress-strain process is developed.The test results show that there is no compaction stage in the stress-strain curves of the coal under typical mining stress.The increase rate of permeability at the testing points before and after the peak stress is small,but that at the peak stress point is very large.The permeability curve of the coal under the conventional triaxial loading is V-shaped.The conceptual permeability model under the conventional triaxial loading can be divided into decreasing section,slow increasing section before the peak,sharp increasing section and slow increasing section after the peak.The permeability curve of the deep coal under mining stress is inverted Z-shaped.The conceptual permeability model under the mining stress path can be divided into slow increasing section before the peak,sharp increasing section and slow increasing section after the peak.Finally,it is validated that the developed theoretical permeability model can evaluate the permeability evolution of the deep coal under different mining layouts.

关 键 词：深部煤体 渗透率演化 采动应力 概化模型 全应力–应变 

分 类 号：TD712[矿业工程—矿井通风与安全]