Abstract:

This paper briefly introduces the rockmass slippage that happened at the exit section of 3track Dabanxi tunnel on Yuhuai Railway and analyzes on the causes and treatment measures of the slippage. The paper places emphasis on the reinforcement construction of forepoling and Maitype grouting rockbolts and on the results of the application of monitoring and measurement. The paper also raises some suggestions for the construction of the portal sections of shallowburied largespan tunnels located in soft ground in raining seasons.

Key words: 3track railway tunnel  , shallowdepth soft ground rockmass slippage  , treatment