Study on vertical load distribution of pile group-liquefied soil system under horizontal earthquake

The dynamic response of pile-liquefied soil is a complex problem. Based on the shaking table test test, the vertical bearing characteristics of pile foundation - liquefied soil system under simulated horizontal seismic force are analyzed and studied with the help of MIDAS GTS three-dimensional finite element analysis software. Study the load borne by the pile top under horizontal earthquake with a certain vertical load, different pile spacing and different vibration time, The cumulative coefficient CCPF of pile side friction is introduced. At different vibration times the distribution of CCPF along the pile body of single pile and pile groups with different pile spacing is analyzed, it is concluded that CCPF can intuitively reflect the distribution law of pile side friction during vibration. When the value of CCPF at the pile bottom is equal to 1, it means that the load actually acting on the pile top is equal to the average value of the total load. When CCPF at the pile bottom is less than 1, it means that the load on the pile top is less than the average value of the total load. When CCPF at pile bottom is greater than 1, it indicates the load on the pile top is greater than the average of the total load.