Abstract: A bauxitic mudstone stratum was encountered during the construction of the air-return vertical shaft in Nianzigou coal mine. And the rock-mass swelling dramatically, which cause a great problem on the supporting method, under the influence of water inflow from the above shaft wall. Firstly, the grouting technique was used to sealing the inflow water; then, polystyrene foam board was utilized for decreasing the swelling deformation of the rock mass before casting the reinforced concrete shaft wall. By taking this composite supporting technology, the bauxitic mudstone stratum was passed rapidly, safely and economically, which explored an effective supporting method for shaft construction similarly.

Key words: vertical shaf, bauxitic mudstone stratum, compound support