Abstract: Current vibration grouting experiments typically utilize axial vibration methods, concentrating the vibration energy primarily at the end of the drill rod, thereby causing minimal radial disturbance to the surrounding soil. To address this issue, we develop a vibration grouting test system with adjustable frequency and radial excitation capabilities. Using this device, we conduct vibration grouting experiments on saturated sandy soil under various excitation conditions, analyzing the effects of vibration frequency and injection hole depth on the diffusion performance of geopolymer slurry in saturated sandy soil. The results indicate that under constant maximum grouting pressure, the width of the grout consolidation body significantly increases with vibration frequency. Compared to static grouting, the application of vibrational excitation at frequencies of 10 Hz, 30 Hz, and 50 Hz results in an increase in consolidated body length by 1%, 20%, and 26%, respectively. Additionally, the width of the consolidated body increases by 80%, 113%, and 187%. As the depth of the injection hole increases, the width of the consolidation body gradually decreases. The grouting pressure exhibits a three-stage change over time: a slow rise, a rapid increase, and a sharp escalation. With increasing vibration frequency, the rate of pressure increases in each stage decreased, leading to longer grouting duration and increased total grout volume. Conversely, the depth of the injection hole has the opposite effect on these indicators. At different times, the additional soil pressure at each measurement point increases with vibration frequency and decreases with injection hole depth. The measurement point closest to the injection hole horizontally records the highest additional soil pressure. Centered on this point, the additional soil pressure at lower vertical measurement points is less than at upper symmetric positions.