Open AccessExperimental Analysis of Deformation Mechanics and Stability of a Shallow-Buried Large-Span Hard Rock Metro Station
Author(s) -
Wei Li,
Jiwen Bai,
Kexian Li,
Shijie Zhang
Publication year - 2020
Publication title -
advances in civil engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.379
H-Index - 25
eISSN - 1687-8094
pISSN - 1687-8086
DOI - 10.1155/2020/4031306
Subject(s) - excavation , arch , geotechnical engineering , span (engineering) , deformation (meteorology) , geology , settlement (finance) , vault (architecture) , metro station , cover (algebra) , section (typography) , mining engineering , engineering , structural engineering , mechanical engineering , oceanography , world wide web , computer science , transport engineering , payment , advertising , business
Based on a certain Qingdao metro station, a large-scale three-dimensional model test has been carried out to investigate the stability of the surrounding rock masses (hard rock) and a large-span metro station under different excavation methods and technologies. The model test includes an entire section excavation, an arch-cover excavation, and a primary support arch-cover excavation. Compared with the entire section excavation, the primary support arch-cover method can effectively control the vault settlement and clearance convergence deformation of the surrounding rock masses, reducing them by 15–30%. The deformation itself goes through three stages: slow, abrupt, and stable. The excavation of the “middle hole” creates a drastic change in the tunnel vault during the arch-cover excavation; however, the timely application of supports can effectively constrain the range of disturbance caused by the excavation and weaken the degree of load agglomeration of the surrounding rock masses.