首页|Floor heave controlling method for high-speed railway tunnels using a foamed concrete compressible layer
Floor heave controlling method for high-speed railway tunnels using a foamed concrete compressible layer
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NETL
NSTL
Elsevier
Floor heave in railway tunnels, caused by the time-dependent behavior of soft rock, poses a significant threat to the safe operation of high-speed trains. Based on the yielding support principles, the compressible layer is a potential solution to address the time-dependent floor heave in railway tunnels. However, suitable materials for the compressible layer haven't been developed. In this study, an innovative foamed concrete-filled polyethylene pipe (FC-PEP) is proposed for use as the compressible layer. First, the high compression capability of FC-PEP and its response to long-term train load action were investigated by series of compression tests. The tests results revealed that the stress-strain curves of FC-PEP exhibited an evident stress plateau stage prior to densification, with a maximum compression strain reaching 0.50-0.54 during this stage, which can meet the high compression capability requirement of compression layer. Furthermore, when the density of FC-PEP ranges between 600 and 750 kg/m~3 , the long-term dynamic train load has little impact on its high compression capability, indicates its feasible for controlling floor heave. Finally, based on the monitoring data of floor heave in a railway tunnel, the performance of the FC-PEP layer was investigated through numerical simulations. The numerical results indicate that if a 20 cm thick FC-PEP compressible layer is constructed between the primary support and secondary lining, can reduce floor heave in the railway tunnel by 33.0 %, thereby demonstrating the feasibility of the FC-PEP layer as an effective solution.
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Science, Wuhan, Hubei 430071, China||University of Chinese Academy of Sciences, Beijing 100049, China
China Railway Eryuan Engineering Group Co. LTD, Chengdu, Sichuan 610031, China
NETL
NSTL
Elsevier
