X. Zhang
22 records found
1
Authored
Distributed fiber optic sensors for tunnel monitoring
A state-of-the-art review
Quasi-rectangular shield tunneling is a cutting-edge trenchless method for constructing metro tunnels with double tubes, owing to its advantages in saving underground space and reducing ground disturbance. However, the conventional quasi-rectangular shield tunneling method is ...
Monitoring the deformations of immersed tunnels is important during the entire tunnel service life to assess the structural integrity of the tunnel. Conventional joint deformation monitoring is based on manual levelling measurements and normally occurs only at multi-year inter ...
Backfill grouting plays a vital role in shield tunneling. This paper aims to present a comprehensive review of the development and progress of backfill grouting materials specifically designed for shield tunneling. Initially, the various components of grouts, such as pozzolani ...
Seasonal joint deformations within an immersed tunnel are important indicators to assess structural behavior and therefore should be monitored in detail. In this study, distributed optical fiber sensors (DOFS) are applied to precisely measure the seasonal joint deformations in ...
Materials for Seismic Isolation Layer of Shield Tunnels” by Qi Yang,
Ping Geng, Liangjie Wang, Bingbing Zhao, and Pingliang Chen.
https://doi.org/10.1061/(ASCE)MT.1943-5533.0004466.@en
The short-term deformation behavior of immersed tunnels due to daily or monthly temperature changes and tidal variations is often not monitored but forms important input for a structural health assessment of the tunnel. In this study, distributed optical fiber sensors (DOFSs) ...
Slab track-bridge interaction subjected to a moving train
An improved matrix formulation and truncation method
Distributed optical fiber sensors (DOFS) allow for distributed strain sensing and can be installed to function as extensometers for measuring point-displacements. This paper discusses the metrics of optimal sensing fiber selection for point-displacement measuring. Key metrics ...
Pipe jacking has been the dominant trenchless technology for constructing small (\2 m) to medium-diameter (\4 m) tunnels. Uncertainties and construction difficulties increase significantly when the diameter of the tunnel exceeds 4 m. This paper presents a case study of the lar ...
In this paper, a probabilistic analysis is implemented to determine the settlement of immersed tunnel elements and the effects of subsoil stiffness variability. A soil-structure interaction model is used to study the effects of subsoil stiffness on the shear behavior of tunnel ...
Settlements of immersed tunnel on soft ground
A case study
This paper focuses on the settlement analysis of immersed tunnel on soft ground. Even under careful design, immersed tunnel may have problems of excessive settlement and the resulting concrete cracking or structure leakage during operation period. Yongjiang Tunnel, the first i ...
With the acceleration of urbanisation in China, land shortage has become a severe problem in metropolises. As the medium and shallow underground space in central urban areas has been developed to a matured or even saturated extent, development of deep underground space (DUS) b ...