In this study, the low-field nuclear magnetic resonance (NMR) testing technique was adopted to experimentally investigate the seepage processes of chemical grout flow in fractured rock under various temperatures and confining pressures. The variations in the NMR parameters, including the tested porosity, transverse relaxation time (T₂) distribution and T₂ peak area, were quantitatively analysed to study the seepage characteristics under different grouting conditions. The changes in the grout viscosity as a function of the temperature were studied. Then, the effects of injection pressures and temperatures on the seepage characteristics of porous sandstone with a single fracture and a constant confining pressure of 20 MPa were systematically investigated. The results indicated that the viscosity of the grout shows obvious time-dependent and temperature-dependent characteristics. The flow pattern of the grout is greatly dependent on the injection pressure, whereas it is less affected by the temperature. The permeability of the sandstone shows an increasing trend as the injection pressure increases and the temperature decreases.

在这项研究中，采用低场核磁共振（NMR）测试技术来实验研究在不同温度和围压下裂隙岩石中化学灌浆渗流的过程。定量分析了NMR参数的变化，包括测试的孔隙率，横向弛豫时间（T ₂）分布和T ₂峰面积，以研究不同灌浆条件下的渗流特性。研究了灌浆粘度随温度的变化。然后，注入压力和温度对多孔砂岩渗流特性的影响系统地研究了单一裂缝和恒定围压为20 MPa的情况。结果表明，水泥浆的粘度具有明显的时间依赖性和温度依赖性。灌浆的流动方式在很大程度上取决于注入压力，而受温度影响较小。随着注入压力的增加和温度的降低，砂岩的渗透率呈现出增加的趋势。