In order to analyze the strain and crack expansion of the shield tunnel lining structure during the op-eration period under the single and double side waterfall modes,the finite element software Abawus was ap-plied to establish a bed-tunnel-soil finite element model,and the initial crack expansion was achieved by ex-tending the finite element function to derive the lining strain and crack expansion law.The results show that the lining strain and crack extension are vary asymmetrical due to the drop in water level on one side,with the vertical strain on the drained side being about 2.6-7 times longer than the symmetrical point on the undrained side.The vertical crack extension on the undrained side is 0.015 times longer than that on the drained one.Compared with the waist of the arch,the cracks in the top and foot of the arch are more obvious,and the crack extension in the foot of the arch is the longest,about twice as long as the crack extension in other loca-tions.
维普
万方数据
