Model Test Study On The Interaction Of Subway Tunneling And Stratum In Ground Fissure

Because of function and influence of factors, such as nature and factitiousness...etc, since 50's in last century, 14 ground fissures have turned up successively in Xi'an, of which activity time is long and the scale is large that is still rare in the domestic, and are in constantly developing. These ground fissures will seriously affect the Metro project in Xi'an, if can't be taken proper measures. Because the Metro project is unable to avert, will pass through these ground fissures, and great damage are not allowed after the Metro is completed and put into operation, so to make sure how the ground fissures affect the subway Tunneling and solve the problem seems particularly important.The author researches how the ground fissures affect the box tunnel structure in the typical depth of the layers 20.0m scope of Xi'an in use of the foundation settling experiment field of Chang' an university to imitate ground fissure activities. Using extensometer, leveling instrument,the steel turns on lathe type pressure box,strain slice test system...etc,in the experimenrt we can gain the stress-strain characteristic of subway structure crossing the ground fissure, the stress situation of soil in structure's peripheral and the settling characteristic of soil in the stratums, makes sure the damage form of the box tunnel structure.This paper laid special stress on introducing the results of the box tunnel structure cut through the ground fissure with 30°,and though the comparison of this model test,the model test of box tunnel structure cut through the ground fissure with 90°, and the model test of shield structure with soft joints, makes sure the damage form of the box tunnel structure cut through the ground fissure with 30°, to provide reference for design,construction and safety operation of Xi'an subway.