In order to solve the problem of heavy load in the construction of rerouted roads on the upper part of the backfilled open cut tunnel,taking the newly built Mawuliang Tunnel in Longnan section of Jingli Expressway as the re-search object,light foam concrete was used to replace the original design ordinary concrete materials,and the stress and safety of the open cut tunnel lining structure after backfilling with three different light foam concrete were calculated u-sing the numerical simulation method,and compared with the calculation results of C15 ordinary concrete backfilling.The results show that the safety factor of inverted arch bottom is 0.92 when CF0.5 foam concrete is used for backfill-ing,and the safety factors of inverted arch bottom and arch foot of other replacement backfilling methods are greater than 1.0.Considering that the tunnel is in a strong earthquake zone,CF5.0 foam concrete is determined as backfill ma-terial,and the safety factor of arch foot after backfilling is 8.9,and the safety factor of inverted arch bottom is 3.4.
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