Abstract
Shielding tunnel construction always has negative impacts on the surrounding buildings. Because of repeated disturbances caused by the construction, more attention should be paid to the impacts of the nonsynchronous construction of a twin-tunnel. In this research, a three-dimensional model was established to simulate the construction process of a twin-tunnel in a section of the Hefei No. 4 metro line, and the calculation results were validated with the measured settlement data. Based on the model, the ground settlement and the existing pipeline responses were studied in detail. The results showed that, after the first tunnel (FT) construction, the settlement curves conformed to a Gaussian distribution. Additionally, after the second tunnel (ST) construction, the final settlement curves were no longer completely symmetrical. The influences of the twin-tunnel space and the pipeline-soil relative stiffness on the settlements were further studied. The results showed that the final settlement curves of the ground surface and the pipeline were mainly W-shaped, U-shaped, and V-shaped. As the twin-tunnel space increased and the pipeline-soil relative stiffness decreased, the settlement curve gradually changed from V-shaped to W-shaped. C was defined as the ratio of two maximum settlements in the W-shaped settlement curve. As the space increased, C started to decrease from 1 and then increased to 1.
Highlights
Shielding tunnel construction always has negative impacts on the surrounding buildings
The ground settlement and the existing pipeline responses were studied in detail. e results showed that, after the first tunnel (FT) construction, the settlement curves conformed to a Gaussian distribution
Many scholars have achieved research results related to the influence mechanisms of tunnel construction and the prediction method of settlements. e Peck formula is the most widely used by engineers and researchers
Summary
For a more accurate simulation result, the model considered the digging pressure of the excavation plane, the horizontal jacking force, and the grouting pressure on the previous segments. E measured maximum settlement was −10.2 mm, the calculated maximum settlement was −11.4 mm, and the difference between the two was 11% E analysis of the measured and simulated settlement values showed that the calculation results of the model were credible. E analysis of the measured and simulated settlement values showed that the calculation results of the model were credible. erefore, further analysis could be made based on the results of this model
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
