在煤炭开采中，煤层注水可有效防突降尘和防治冲击地压。为了研究深部煤样注水过程中孔隙结构和渗流通道的演化过程，以平煤十二矿己15-31030工作面的深部煤体为研究对象，通过低场核磁共振成像设备在线测试了三个原煤试样在不同注水压力下的T2谱和含水量分布情况。通过对不同注水压力下的T2谱进行分析，获得了煤样注水过程中的孔径分布和孔隙结构的演化过程。通过核磁共振成像技术，初步实现了煤样注水过程中孔隙结构和渗流通道演化的可视化，可更直观地观测煤样注水过程中的动态演化过程，更深入地理解不同煤样T2谱演化过程异同的内在原因。进一步提出了一种根据T2谱进行不同孔径的孔的渗透率贡献度计算方法，定量分析了煤样注水过程中不同孔径的孔对水渗过程的贡献度。并对T2谱进行了孔裂隙的分形维数计算，定量分析煤样孔裂隙的渗流空间含量和异质性。研究发现：平煤十二矿深部煤样注水过程中T2谱表现出三峰特点，中孔、大孔和微裂隙的含量与连通性都大于微孔和小孔，注水过程中渗流通道主要由连通性较好的中孔、大孔和微裂隙构建。煤样注水过程中大孔和微裂隙贡献了99%以上的渗透率;微孔、小孔和连通性较差的孔主要参与储水而不参与运水。注水过程中当煤样孔隙连通性较差，不存在明显的优势渗流通道时，提高注水压力可以使更多的孔隙参与到渗流的过程中;但当煤样中部分孔隙连通性较好形成优势渗流通道时，提高注水压力也很难使更多的孔隙参与到渗流的过程中。在设计煤层注水参数时应特别关注这一现象。

In coal mining,coal seam water infusion can effectively prevent coal outburst,dust and rock burst.In order to study the evolution process of pore structure and seepage channels during water infusion in deep coal samples,the coal at the No.310130 working face of the Ji15 coal seam in No.12 Pingdingshan Coal Mine was sampled for this study.The T2 spectrum and water content distribution of three raw coal samples under different water infusion pressures were tested online by low-field nuclear magnetic resonance imaging equipment.By analyzing the T2 spectra under different water infusion pressures,the pore size distribution and pore structure evolution process of the coal sample during water injection were obtained.Through the nuclear magnetic resonance imaging technology,the visualization of the evolution of the pore structure and seepage channels during the water infusion process of coal samples was initially realized,the dynamic evolution process of the coal samples during the water infusion process was observed more intuitively,and the internal reasons for the similarities and differences of the T2 spectrum evolution process of different coal samples were more deeply understood.A method for calculating the permeability contribution of pores with different pore diameters based on the T2 spectrum was proposed,and the contribution of pores with different pore diameters to the water permeability process during the water infusion process of coal samples was quantitatively analyzed.The fractal dimension calculation of T2 spectrum was performed,and the content and heterogeneity of the seepage space of coal samples were quantitatively analyzed.The test results show that the T2 spectrum of the deep coal sample in the No.12 Pingdingshan Coal Mine shows the characteristics of three peaks during the water injection process.The content and connectivity of mesopores,macropores,and microcracks are all greater than those of micropores.In the process of water infusion of coal samples,macropores and microcracks contribute more than 99% of the permeability.The micropores and pores with poor connectivity are mainly involved in water storage rather than water transport.During the water infusion process,when the pore connectivity of the coal sample is poor and there is no obvious dominant seepage channel,increasing the water injection pressure can make more pores participate in the seepage process.However,when the coal sample has better connectivity and has dominant seepage channel,it is difficult to increase the water infusion pressure to make more pores participate in the seepage process.Therefore,it is worth noting it during the design of coal seam water infusion parameters.