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A platform for research: civil engineering, architecture and urbanism
Vibration velocity of X-section cast-in-place concrete (XCC) pile–raft foundation model for a ballastless track
This paper presents two case studies of the dynamic response of a ballastless track, X-section cast-in-place concrete (XCC) pile–raft (referred to as BTXPR) foundation embedded in sand subsoil. Model tests were conducted at a scale of 1/5 using a 7 m deep box with cross-sectional dimensions of 5 m × 4 m. In one case the box was filled with subsoil consisting of air-dried sand, whereas in the other case the box was filled with saturated sand. The tests involved measurement and analysis of the response in velocity under different applied cyclic load frequencies. It has been shown that the magnitude and variation of vibration velocity in the BTXPR foundation are closely related to the degree of saturation of the subsoil. Due to the existence of pore water in the saturated sand subsoil, the first natural frequency of the BTXPR foundation embedded in saturated sand is 5 Hz lower than that in air-dried sand. In addition, the amplitude of vibration velocity of the BTXPR foundation embedded in the saturated sand is about 9%∼36% higher than that of the air-dried sand. The research results provide an insight into BTXPR foundations with respect to theoretical analysis and calculation.
Vibration velocity of X-section cast-in-place concrete (XCC) pile–raft foundation model for a ballastless track
This paper presents two case studies of the dynamic response of a ballastless track, X-section cast-in-place concrete (XCC) pile–raft (referred to as BTXPR) foundation embedded in sand subsoil. Model tests were conducted at a scale of 1/5 using a 7 m deep box with cross-sectional dimensions of 5 m × 4 m. In one case the box was filled with subsoil consisting of air-dried sand, whereas in the other case the box was filled with saturated sand. The tests involved measurement and analysis of the response in velocity under different applied cyclic load frequencies. It has been shown that the magnitude and variation of vibration velocity in the BTXPR foundation are closely related to the degree of saturation of the subsoil. Due to the existence of pore water in the saturated sand subsoil, the first natural frequency of the BTXPR foundation embedded in saturated sand is 5 Hz lower than that in air-dried sand. In addition, the amplitude of vibration velocity of the BTXPR foundation embedded in the saturated sand is about 9%∼36% higher than that of the air-dried sand. The research results provide an insight into BTXPR foundations with respect to theoretical analysis and calculation.
Vibration velocity of X-section cast-in-place concrete (XCC) pile–raft foundation model for a ballastless track
Sun, Guangchao (author) / Amenuvor, Andrew Cudzo / Liu, Hanlong / Kong, Gangqiang
2017
Article (Journal)
English
Vibration , Sand & gravel , ballastless track , Air , Dimensions , X-section cast-in-place concrete (XCC) pile , Theoretical analysis , Cyclic loads , fondation en radeau pieux , Dynamic response , Studies , Piles , Case studies , vibration velocity , essai sur modèle , Velocity , model test , Observations , vitesse de vibration , voies sans ballast , Foundations , Saturation , Subsoils , Mechanical properties , Pore water , pile–raft foundation , Measurement , Concrete , pieu section X de béton coulée en place (XCC) , Resonant frequency , Sand
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