Experimental Analysis of the Slurry Diffusion Behavior Characteristics of Point Source Grouting and Perforated Pipe Grouting in Sandy Soil

Grouting technology is widely used in foundation treatment to achieve the uplifting and correction of buildings. In this context, analyzing the slurry diffusion mechanism and the resulting behavioral characteristics is crucial for guiding precise engineering design practices. This study utilized an independently developed grouting model testing system to conduct grouting experiments on sandy soil employing diverse grouting methodologies and infiltration diffusion patterns. The objectives were to elucidate the characteristics of grouting pressure, lifting displacement, and stress variations within the sandy soil. The findings indicate that slurry diffusion in sandy soil typically progresses through three distinct stages, exhibiting a cyclic pattern of “compaction–splitting–compaction”. We observed that the slurry diffusion pattern closely aligns with the trend of uplift displacement changes. Furthermore, a general downward trend was observed in the stress attenuation of sand during the grouting process. Marked disparities exist in the slurry diffusion mechanism and stress characteristics between point source and perforated pipe grouting. These research outcomes contribute significantly to advancing the theoretical understanding and experimental design of grouting techniques in sandy soil.