<<
[an error occurred while processing this directive] | [an error occurred while processing this directive] >>
Numerical Simulation of Construction Process and Analysis of Influencing Factors in Parallel Shield Tunnelling with Close Distance
(1 CCCC First Highway Consultants Co., Ltd., Xi′an 710075; 2 School of Civil Engineering, Xi′an University of Architecture and Technology, Xi′an 710055)
Abstract Taking the intercity rail project from Xi′an North Station to Xianyang Airport as an example, this paper analyzes the impact of the adjacent parallel construction of new tunnels on the existing tunnels through finite element software ANSYS, regarding two construction options of "left bore first before right bore" and "right bore first before left bore". It is mainly focused on the influence patterns of such factors as the ground loss rate, shield thrust and grouting during shield construction. The results show that the option of "left bore first before right bore" has less effect on the ground displacement as well as the stress and strain of the existing tunnel segments; with smaller ground loss rate; the smaller the ground settlement is, the smaller the maximum ground settlement will be, and the flatter the ground settlement slope will be; the greater the shield thrust is, the greater the ground settlement will be,and as the shield excavation distance extends, the ground settlement will gradually decrease until it tends to stabilize; the higher the elasticity modulus of the grouting materials is, the lower the amount of ground settlement will be.
Abstract：
Taking the intercity rail project from Xi′an North Station to Xianyang Airport as an example, this paper analyzes the impact of the adjacent parallel construction of new tunnels on the existing tunnels through finite element software ANSYS, regarding two construction options of "left bore first before right bore" and "right bore first before left bore". It is mainly focused on the influence patterns of such factors as the ground loss rate, shield thrust and grouting during shield construction. The results show that the option of "left bore first before right bore" has less effect on the ground displacement as well as the stress and strain of the existing tunnel segments; with smaller ground loss rate; the smaller the ground settlement is, the smaller the maximum ground settlement will be, and the flatter the ground settlement slope will be; the greater the shield thrust is, the greater the ground settlement will be,and as the shield excavation distance extends, the ground settlement will gradually decrease until it tends to stabilize; the higher the elasticity modulus of the grouting materials is, the lower the amount of ground settlement will be.
WANG Bo1 ZHENG Pengfei1 HU Jiangyang1 LIU Junyong1 LIU Shuo2
.Numerical Simulation of Construction Process and Analysis of Influencing Factors in Parallel Shield Tunnelling with Close Distance[J] MODERN TUNNELLING TECHNOLOGY, 2021,V58(4): 117-124
2021, Vol. 58 