An increasing number of engineering accidents have shown that the failure of a tunnel can propagate to a neighbouring tunnel.However,due to the complex interaction between the failed tunnel structure and the soil medi...An increasing number of engineering accidents have shown that the failure of a tunnel can propagate to a neighbouring tunnel.However,due to the complex interaction between the failed tunnel structure and the soil medium,the mechanism by which the failure is propagated between two closely spaced tunnels remains unclear.In this study,the coupled EulerianLagrangian(CEL)modelling technique was adopted to investigate the influence of a failed tunnel(FT)on an adjacent tunnel,which was termed an“influenced tunnel”(IT).The safety of the IT was analysed in detail under different circumstances,such as different failure positions of the FT,different failure degrees of the FT,and different spatial relationships between the two tunnels.The simulation results indicated that the most adverse case may occur when the two tunnels are arranged as offsets and the IT is the upper tunnel.Under this circumstance,significant shear deformation may occur in IT because IT is located at the shear band of the FT.展开更多
Piles,as the basic components that support superstructures,are inevitably subjected to cyclic lateral loads.The lateral response(deformation and capacity)of a pile under a cyclic lateral load has been well documented....Piles,as the basic components that support superstructures,are inevitably subjected to cyclic lateral loads.The lateral response(deformation and capacity)of a pile under a cyclic lateral load has been well documented.However,little attention has been given to its vertical displacement.In this study,centrifuge model tests were conducted to study the vertical displacements of a pile under cyclic lateral loads.It was found that a pile may settle during cyclic lateral loading.Meanwhile,the ultimate settlement of the pile was larger when the vertical load or the amplitude of the horizontal displacement was greater.All the observations can be explained by the loss of mobilized shaft friction and the transmission of the unbalanced force to the pile tip.展开更多
基金the National Natural Science Foundation of China(Nos.41630641 and 51808387)。
文摘An increasing number of engineering accidents have shown that the failure of a tunnel can propagate to a neighbouring tunnel.However,due to the complex interaction between the failed tunnel structure and the soil medium,the mechanism by which the failure is propagated between two closely spaced tunnels remains unclear.In this study,the coupled EulerianLagrangian(CEL)modelling technique was adopted to investigate the influence of a failed tunnel(FT)on an adjacent tunnel,which was termed an“influenced tunnel”(IT).The safety of the IT was analysed in detail under different circumstances,such as different failure positions of the FT,different failure degrees of the FT,and different spatial relationships between the two tunnels.The simulation results indicated that the most adverse case may occur when the two tunnels are arranged as offsets and the IT is the upper tunnel.Under this circumstance,significant shear deformation may occur in IT because IT is located at the shear band of the FT.
基金Project supported by the National Natural Science Foundation of China(Nos.41630641 and 51808387)。
文摘Piles,as the basic components that support superstructures,are inevitably subjected to cyclic lateral loads.The lateral response(deformation and capacity)of a pile under a cyclic lateral load has been well documented.However,little attention has been given to its vertical displacement.In this study,centrifuge model tests were conducted to study the vertical displacements of a pile under cyclic lateral loads.It was found that a pile may settle during cyclic lateral loading.Meanwhile,the ultimate settlement of the pile was larger when the vertical load or the amplitude of the horizontal displacement was greater.All the observations can be explained by the loss of mobilized shaft friction and the transmission of the unbalanced force to the pile tip.
