###### Abstract  
Slurry filling technology has been increasingly adopted in coal mines in the northwest region. However, due to the complexity of slurry transport pipelines, blockages remain a frequent issue. These blockages can reduce operational efficiency, with different blockage types causing varying levels of damage. Despite the significance of this issue, there is limited in-depth analysis in the literature, especially regarding the role of pressure in pipeline blockages. This study utilizes FLUENT 2020R2 (the fluid simulation software) for computational fluid dynamics simulations of slurry pipeline blockages, focusing on the impact of blockage morphology, location, and extent on slurry transport pressure distribution. The results indicate that the greater the blockage extent, the more pronounced the pressure loss along the pipeline. Furthermore, blockage morphology also has a varying effect on pressure drop. At lower blockage levels, the pressure drop variation across the three blockage types is relatively minor. However, when the blockage exceeds 50%, sedimentation-type blockages (B-blockage) cause the most significant harm. The study identifies the underlying causes of this and provides recommendations to mitigate sedimentation-type blockages. Within 1 m downstream of the blockage, the flow velocity rapidly decreases to near zero, creating a stagnant zone that accelerates the deposition of gangue particles, thereby worsening the blockage. After a sudden blockage, the location of the blockage has minimal impact on pressure drop. The influence on slurry pressure is ranked as follows: sedimentation-type blockage (B-blockage) > composite blockage (C-blockage) > attachment-type blockage (A-blockage). s _article_coal-based solid waste, yielding significant economic and social benefits [2]. However, this technology also faces the issue of pipeline blockages in the slurry transport system. The technology involves mixing coal-based solid waste with water in a specific ratio, and then preparing a slurry with the required concentration either on the surface or underground for transportation. The slurry is pumped through pipelines, with the remaining voids in the underground mined-out areas serving as the filling location, enabling in situ filling of solid waste and achieving zero discharge on the surface. Therefore, the slurry transport pipeline is the critical component of this filling technology. However, various factors can lead to pipeline blockages, which reduce the pipe diameter, increase the flow resistance, cause a significant rise in pumping pressure, and decrease the slurry flow rate. In severe cases, insufficient flow velocity may result in complete blockage, preventing continuous and timely filling of the mined-out spaces. Foreign researchers [3; 4; 5] have conducted in-depth studies on the detection and localization of pipeline blockages. [PERSON] and [PERSON] [6] analyzed the causes of slurry pipeline blockages, focusing on the effects of factors such as flow velocity and slurry concentration on the blockage mechanism. [PERSON] et al. [7] used fault tree analysis to investigate various factors and their logical relationships contributing to filling pipeline blockages, identifying 16 key factors, including improper slurry mix and excessive bends, as the most significant contributors. [PERSON] et al. [8] examined the causes of pipeline blockages due to excessive instantaneous slurry flow velocity. [PERSON] [9] conducted a computational fluid dynamics (CFD) simulation to analyze the flow characteristics of slurry in a 90\({}^{\circ}\) elbow pipe, investigating the effects of varying velocity and particle size on the particle velocity distribution and volume fraction. The results indicated that at lower velocities, slurry tends to experience phase separation, whereas at higher velocities, the particle distribution becomes more uniform, which is in line with the requirements for long-distance pipeline transportation.