Progress Simulation Model of Plateau Long Tunnel Excavated by the Combined Method of the DB and TBM
Long distance tunnels are commonly used to cross complex terrains.The combination of the Drilling and Blasting method(DB),and the Tunnel Boring Machines(TBM)method for excavation in long tunnels on the plateau can fully leverage the flexibility of the DB meth-od and the efficiency of the TBM method,but it also increases difficulty in schedule management.This paper considers the challenges of long tunnel construction on the plateau,such as long excavation durations,complex geological condition,low air pressure,and low temperature.Based on the studies on excavation simulation models of the DB method and TBM method,the paper examines the duration and impact of switching between the DB and TBM excavation method.It then establishes a simulation model for the excavation progress of long tunnels on the plateau using a combination of the DB method and TBM method,expressing it in the form of a duration function and control flow.Case studies demonstrate that this model can be applied to the situation of simultaneous multiple working-faces in both construction adit and main tunnel,and it can accommodate complex construction boundary conditions of the DB and TBM excavation.The research can provide support for excavation progress management in long-distance tunnels for water diversion,highways,railroads,and other projects in plateau regions.
long tunneldrilling and blasting excavationTBM excavationexcavation simulationduration evaluation
万方数据
维普
