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Abstract The critical anchorage length refers to the limit anchorage length of the rod of anchorage structure in certain soil and rock. If the rod length exceeds this length，the bearing capacity will not obviously increase，but if the rod length doesn¢t reach this length，the bearing capacity can be further improved. In recent ten years，the relevant problems of critical anchorage length are researched in China，and many results have been obtained. The typical research results have reviewed and analyzed. It is emphasized that it is still short of systemic study，and this problem has not been solved and is still under discussion. The critical rod anchorage length is a common phenomenon. This problem needs further study on the current design methods based on the average shear stress theory，and will result in the ultimate change of traditional anchorage structure design concepts. For the discovery of the critical anchorage length phenomenon，it is about 10 years earlier in foreign countries than in China. However，as the term of critical anchorage length with distinct concept，it should be focused on.
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Received: 15 August 2008
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