为了探讨承力盘数量对扩盘桩的承载力及桩周土体的影响，通过自行研制的小型半面桩模型试验设备，采用数字图像相关（digital image correlation, DIC）技术设备实时记录桩周土体变形情况，并以此分析桩周土体位移与破坏特征。试验研究表明，加载时承力盘下土体受压形成压缩区且该区域的影响范围随着荷载增大逐渐变大，同时向两侧土体挤压；承力盘上方裂隙持续发展至最后形成临空区，且该区域随荷载增加而扩大。三盘桩较单盘桩和二盘桩的承载力提升较大，但其荷载-沉降曲线形状较为相似。施加荷载过程中，靠近承力盘和承力盘下方的桩周土体位移变化最明显。因此，研究结果对于承力盘数量对桩周土体影响等相关方向研究做了补充。

In order to explore the impact of the number of bearing plates on the bearing capacity of the expanded pile and the soil around the pile, a small half face pile model test equipment developed was used to record the deformation of the soil around the pile in real-time using using digital image correlation (DIC) technology equipment, and to analyze the displacement and failure characteristics of the soil around the pile. Experimental research shows that during loading, the soil under the load-bearing plate is compressed to form a compression zone, and the influence range of this zone gradually increases with the increase of load, while squeezing towards the soil on both sides. The cracks above the bearing plate continue to develop until a free zone is formed, and this area expands with the increase of load. The bearing capacity of three plate piles has been significantly improved compared to single plate piles and two plate piles, but their load-settlement curve shapes are relatively similar. During the loading process, the displacement changes of the soil around the pile near and below the bearing plate are the most significant. Therefore, the study supplements the research on the impact of the number of bearing plates on the soil around piles and other related directions.