With the core idea of controlling the advance core deformation around the tunnel,ADECO-RS approach is an instructional design and construction method for soft-rock tunnels.Combining with the actual construction conditions of a soft-rock tunnel project with large section(Taoshuping tunnel),the reasonable reinforcement parameters of soft-rock tunnel with large section based on ADECO-RS approach are obtained by numerical simulation of pre-support around tunnel,reinforcement of the core rock at tunnel face and strengthening of arch springing.The reinforcement parameters of Taoshuping tunnel are evaluated and analyzed with the monitoring data and comparison between the monitoring data and the simulation result.The results show that(1) it is difficult to make the pre-support play the role as the beam and arch to control the stability and deformation of the tunnel face if only reinforcing the rock around the tunnel arch;(2) the reinforcement of soft-rock tunnel face requires long advanced support and the effect will be significant after the reinforcement density reaches a certain value;(3) compared to the tunnel face anchor bolts,the horizontal churning piles and the advance core soil can be mixed together and turn into a complex with higher strength which can significantly increase the bearing capacity of the core soil;(4) feet-lock churning piles can achieve better closed-structure result than the feet-lock bolts.
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