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Abstract The rock anchorage，as especial form of tower foundation in transmission line，can fully utilize the mechanical capability of original rock，and it can provide good pull-resistance capacity. For gradual using this tower foundation in overhead transmission line，some electric power institutes have been completed some real rock anchorage model tests. Based on this real model test of the rock anchorage，different types of rock anchorages are adopted，which included single-anchorage and direct-anchorage by MSC.Marc，software based on the principle of finite element analysis(FEA). The rock anchorage failure modes in three different states of rock intensities including poor(class IV)，medium(class III) and good(class II) are analyzed. And the contrast was processed between simulated results and failure modes in electric power trade design criterion. The results indicate that the rock intensity is the main factor affecting failure modes. The failure mode in current design code does not agree with the fact，and the calculation results of the rock are too larger when considering pull-resistance capacity，which maybe insecure to rock anchorage foundation design. The new failure mode was proposed according to the actual failure mode. At the same time，the availability of MSC.Marc was substantiated for assistant resolving of practical problems in geotechnical engineering.
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Received: 04 February 2009
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