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Numerical Study of Crack Development of Shield Tunnel Lining Segments
(1 Shanxi Provincial Major Laboratory for Highway Bridge & Tunnel, Chang′an University, Xi′an 710064; 2 Zhengzhou Xinggang Investment & Development Group Co. Ltd, Zhengzhou 450016; 3 City Railway Branch, China CREC Railway Electrification Bureau Group, Xi′an 710061; 4 School of Highway, Chang′an University, Xi′an 710064)
Abstract Segment cracks can affect the performance of shield tunnel linings. Based on tunnel segment cracking
caused by a water inflow event in a certain running tunnel of the Xi′an metro, a three-dimensional nonlinear model was set up using ANSYS software SOLD65 element to analyze the crack development of tunnel segments. The results show that: 1) no cracks appear on the tunnel segment when the load is less than 2 times of the design value with the condition of no void; 2) the number of cracks gradually increases when the load is between 2.5 times and 4times the design value; 3) the relationship between the number of cracks and the load is close to a S-curve; 4) with the condition of voids, bias pressure appears when the designed load is applied, and segment cracks develop rapidly with an increase of the loading; 5) the number of cracks increases dramatically when the applied load is 2.7 times the designed load; 6) the crack distribution is asymmetrical and it is intensive near the voids; and 7) the structure is instable and failed when the applied load is more than 3 times the designed value.
Abstract：
Segment cracks can affect the performance of shield tunnel linings. Based on tunnel segment cracking
caused by a water inflow event in a certain running tunnel of the Xi′an metro, a three-dimensional nonlinear model was set up using ANSYS software SOLD65 element to analyze the crack development of tunnel segments. The results show that: 1) no cracks appear on the tunnel segment when the load is less than 2 times of the design value with the condition of no void; 2) the number of cracks gradually increases when the load is between 2.5 times and 4times the design value; 3) the relationship between the number of cracks and the load is close to a S-curve; 4) with the condition of voids, bias pressure appears when the designed load is applied, and segment cracks develop rapidly with an increase of the loading; 5) the number of cracks increases dramatically when the applied load is 2.7 times the designed load; 6) the crack distribution is asymmetrical and it is intensive near the voids; and 7) the structure is instable and failed when the applied load is more than 3 times the designed value.
LAI Jin-Xing- 1,
4 Qiu-Jun-Ling- 1,
4 Liu- Chi- 1 etc
.Numerical Study of Crack Development of Shield Tunnel Lining Segments[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(1): 138-144
2017, Vol. 54 