<p>Due to the long-term strength degradation of soils, ground anchors often exhibit insufficient anchorage performance during service. Reinforcing the soil around anchors using soybean urease-induced carbonate precipitation (SICP) technology is a potential method to enhance the anchorage performance of active anchors. To explore the mechanism of anchorage performance evolution of SICP-stabilized anchors and the impact pattern of cementation solution concentration on reinforcement effectiveness, urease activity selection tests were conducted to determine the soybean powder concentration for SICP-stabilized soil. Cementation solutions with equal mass ratios of calcium chloride and urea were prepared, and samples of and element specimens of SICP-stabilized anchors were made under different cementation solution concentrations. Direct Shear tests on stabilized soil and interface shear tests on stabilized anchors were performed. Microstructural tests, including XRD and SEM, were also conducted on the stabilized soil within the shear bands of the stabilized anchors. The study found that SICP-stabilized soil exhibits strain-hardening behavior under shear. Cohesion and internal friction angles show a "see-saw" complementary relationship with increasing cementation solution concentration. The bond-slip at the SICP-stabilized anchorage interface exhibits strain-softening behavior. Once the cementation solution concentration exceeds 1.00&#xa0;mol/L, the peak shear strength of the anchorage interface increases linearly with further concentration increases. However, the residual shear stiffness of the anchorage interface is less sensitive to changes in cementation solution concentration. Microstructural analysis reveals 1.75&#xa0;mol/L as a critical threshold. At this concentration, CaCO₃ phase transformation homogenized the pore structure and formed a strong interfacial cementation layer, which enhanced the interface shear strength, initial shear stiffness, and soil cohesion.</p>