Research On The Response And Propagation Characteristics Of Formation Vibration Induced By Subway Operation Near The Foundation Pit

In recent years,with the rapid development of my country's economic level and the improvement of people's quality of life,the subway has developed rapidly in various cities with its characteristics of speed,comfort and convenience,and has become an effective way to reduce ground traffic congestion.But at the same time,the dynamic load generated during the operation of the subway train has caused disturbances to the surrounding soil and buildings(structures),such as the settlement of the surrounding soil,the deformation of underground pipelines,the deformation of buildings on the ground,and the use of indoor precision instruments.And so on,this issue has also attracted the attention of many domestic scholars.In this paper,the numerical calculation method is used to study the vibration response and propagation characteristics of the ground induced by subway train operation near the foundation pit,with emphasis on the influence of the existence of the adjacent foundation pit on the vibration propagation characteristics.The main research contents of this paper are as follows:(1)A three-dimensional finite element model of ground vibration induced by subway operation in a free field was established.The vibration pickup points at different locations on the ground and typical vibration pickup points at a certain distance from the tunnel and different depths were selected to study the surrounding soil layers induced by single and two-way subway train operations in the free field.Vibration response.(2)A three-dimensional finite element model of ground vibration induced by subway operation near a foundation pit is established,and the vibration response of the surrounding soil layer caused by subway trains under the conditions of one-way and two-way subway trains is studied.(3)The vibration propagation characteristics of subway trains in the free field and adjacent to the foundation pit are respectively discussed,and the vibration propagation characteristics of subway trains in the free field and the foundation pit are compared and analyzed when the two-way subway runs.The law of influence of transmission.(4)Parametric analysis of the vibration propagation characteristics of subway trains near the foundation pit is carried out,and the vibration propagation laws of the surrounding environment induced by subway train operation under three conditions of different train speeds,different tunnel depths and different distances from the right tunnel are considered.