Numerical Simulation and Engineering Practice on Steel Support Replacement with Lattice Truss in Deep Railway Foundation Pit
Based on the deep foundation pit project at the entrance of Tianjin Airport Tunnel No.1 on the Beijing-Binhai Intercity Railway,an optimized scheme of traditional steel support replacement with a new type of lattice truss support was proposed.The differences in construction mechanical response between the two conditions were compared and analyzed through numerical research.The engineering application was carried out to verify the rationality of the optimized scheme.The results show that,compared with steel support,the lattice truss scheme does not require side wall embedded parts,which can avoid leakage problems caused by wall repair and preloading damage,and is more conducive to later demolition.Although the strength and stiffness of the lattice truss are weaker than those of the steel support,the lateral displacement,surface settlement and internal support force do not exceed the allowable limitation,and the safety factors are all above 2.0.Through engineering practice,it has been verified that using lattice truss is safe and feasible,which can not only significantly reduce the construction period but also save cost.
deep foundation pitsteel support replacementlattice trussnumerical simulationfield monitoring
万方数据
维普
