Anchorage structures refer to geotechnical engineering reinforcement support structures such as grouted anchor rods, anchor cables, and soil nails. The critical anchoring length of anchored structural rods refers to the ultimate anchoring length of anchored structural rods in a certain geotechnical medium. Beyond this length, its bearing capacity will no longer significantly increase; Not reaching this length, there is still some potential for its bearing capacity to be excavated. For over half a century, research has been conducted on the issue of critical anchorage length from different perspectives both domestically and internationally. However, systematic research is still lacking, and direct research is extremely rare. Therefore, this problem has not been truly solved and is still in the stage of local discovery and exploration and resolution. The research on the critical anchoring length of anchor structures in China started later than abroad, but there has been a significant increase in direct research on this issue in recent years. China has proposed a method for determining the critical anchoring length through experiments, and has studied and determined the critical anchoring length of certain media and corresponding technical specifications