Field test and numerical simulation study on bonding performance of high-strength steel anti-floating anchor rod under rotary jet grouting construction

The paper presents field pull-out tests on reinforcement anti-floating anchor rods for the jet grouting process and investigates the load transfer behavior of these anchor rods under this technique. A comparative study was conducted using field pull-out tests on reinforcement anti-floating anchor rods with the grouting process, revealing the differences in load transfer behavior between the two techniques. The results indicate that reinforcement anti-floating anchor rods formed by the jet grouting process exhibit superior bond strength at the mudstone interface and load transfer performance compared to the grouting process. Based on the ABAQUS finite element simulation software, a finite element simulation method for jet grouting expansion anchor rods was proposed and validated through experimental results. Additionally, the parameter analysis indicates that increasing the tensile strength of the anchor rod raises the ultimate bond strength by approximately 25% per 100 MPa, while increasing the anchorage depth beyond 9.5 m yields diminishing improvements in bearing capacity but reduces ultimate displacement significantly.