Effect analysis on long-short pile combined with reinforcement in passive zone in deep soft soil excavation

The article introduces long-short pile combined with reinforcement in passive zone support structure about some project in detail and analyzes mechanism of the support briefly. The influence of long-short pile and reinforcement in passive zone on deformation of support pile, overall stability of excavation, moment of support pile is analyzed by using finite element method. The results show: compared to no reinforcement, the maximum horizontal displacement of support pile is significantly reduced after reinforcement in passive zone, and overall stability safety factor of excavation has a more substantial increase; After setting a certain amount of reinforcement mass, there has a little effect on maximum horizontal displacement of support pile by using short pile, long-short pile and long pile, but it is minimal by using short pile; The setting of long pile is beneficial to improve the overall stability safety factor of excavation, but whether the passive zone reinforces or not has a greater impact on the stability of excavation; When the parameters of reinforcement mass reach a certain range, the parameters of reinforcement mass has little effect on the maximum horizontal displacement of support pile, but it has a certain role in improving the overall stability safety factor of excavation; The height of reinforcement mass has a great influence on the moment of support pile, but the form and width of reinforcement mass have little effect on the moment of support pile.