Buoyancy characteristic analysis and optimization of precast concrete slab track during casting process of self-compacting concrete  

作　　者：Pengsong Wang Tao Xin Peng Chen Sen Wang Di Cheng 

机构地区：[1]Railway Science and Technology Research and Development Center,China Academy of Railway Sciences Corporation Limited,Beijing,China [2]School of Civil Engineering,Beijing Jiaotong University,Beijing,China [3]Beijing Urban Construction Design and Development Group Corporation Limited,Beijing,China

出　　处：《Railway Sciences》2025年第2期159-173,共15页铁道科学(英文)

摘　　要：Purpose–The precast concrete slab track(PST)has advantages of fewer maintenance frequencies,better smooth rides and structural stability,which has been widely applied in urban rail transit.Precise positioning of precast concrete slab(PCS)is vital for keeping the initial track regularity.However,the cast-in-place process of the self-compacting concrete(SCC)filling layer generally causes a large deformation of PCS due to the water-hammer effect of flowing SCC,even cracking of PCS.Currently,the buoyancy characteristic and influencing factors of PCS during the SCC casting process have not been thoroughly studied in urban rail transit.Design/methodology/approach–In this work,a Computational Fluid Dynamics(CFD)model is established to calculate the buoyancy of PCS caused by the flowing SCC.The main influencing factors,including the inlet speed and flowability of SCC,have been analyzed and discussed.A new structural optimization scheme has been proposed for PST to reduce the buoyancy caused by the flowing SCC.Findings–The simulation and field test results showed that the buoyancy and deformation of PCS decreased obviously after adopting the new scheme.Originality/value–The findings of this study can provide guidance for the control of the deformation of PCS during the SCC construction process.

关 键 词：Casting process Buoyancy characteristics Precast concrete slab track SIMULATION Field test OPTIMIZATION 

分 类 号：O35[理学—流体力学]