Research On The Rule Of Vibration Response Of Soil Under Train-induced Vibration Load In Ground Fissured Area

In order to realize the leap-type economic development,Xi'an which is the starting point of the Silk Road Economic Belt and the 21 st Century Maritime Silk Road is vigorously developing the career of rail transit.However,through the Xi'an subway can not avoid the special geological disasters of ground fissures,which brings a series of problems to the construction and operation of the subway,subway and cause problems of interaction between surrounding rock dynamic environment vibration problems of tunnel cracks,caused widespread concern,and train load induced vibration problem of ground fissure the soil is near field region across the fracture zone of subway construction an important topic to be studied.This paper relies on the National Natural Science Fund Project "the subway under dynamic load of Strata-ground fissure tunnel interaction research",to cross the ground fissures in Xi'an Metro Line 2 as the background,the establishment of large scale power physical test,with the method of numerical simulation to a more profound study reveals the ground fissure field induced by train load the soil vibration rules,the main results are as follows:(1)Carried out with and without cracks when the tunnel surrounding rock dynamic interaction model test,and test on the condition of two the results of a comparative analysis,analysis of ground vibration response from time domain,frequency domain and vibration level evaluation of multi angle,the vibration attenuation,reveals the effect of cracks on the block vibration propagation;also analyzed the rock vibration characteristics of different train speed and different train vibration frequencies.(2)The establishment of three-dimensional finite element model of the complete "train tunnel surrounding rock-crack",the "rolling" method applied to train load,analyzes the train under the condition of ground fissure field response characteristics of surrounding rock mass dynamic vibration analysis of ground fissure zone on both sides of the soil.The effects of the ring.(3)The relevant literature reference prediction of ground vibration of subway,combined with the actual situation of Xi'an subway project,to determine the effect of the five vibration prediction of Xi'an subway vibration correction factor,and derive the formula of surface vibration prediction of Xi'an subway.Combined model test,numerical simulation and prediction formula of ground fissure vibration characteristics of field soil induced by train load,Xi'an take vibration from the source,propagation path and vibration damping at tunnel section increases.