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TBMs: Capabilities, Limitations and Challenges
The Tunnel Boring Machine (TBM) technology has significant advantages over conventional Drill & Blast method, and it has become one of the most common tunnel excavation methods in the world. However, weaknesses of TBM such as the poor adaptability to complex geological conditions create a bottleneck in its functionality, and restrict its further development. Therefore, factors such as engineeri…
Ground Surface Deformation Analysis of Quasi Rectangular EPB Shield Tunneling
The first quasi rectangular shield tunnel in China was developed during the construction of Ningbo Metro Line 3. Based on the Mindlin solution, this paper presents the computerized outcome of the ground surface deformation caused by the following three factors: the hirizontal excess pressure at the exavation face, the frictin between the shield skin and soil, and the grouting force outside the …
Mechanical Analysis of a Super-Large-Diameter Shield Tailskin Under Deep Grou…
The deformation and stress of a super-large-diameter shield tailskin are analyzed in this paper. Four kinds of structure analysis models, i.e. the perfect solid shell model, the defected solid shell model, the perfect hollow-layered shell model, and the defected hollow-layered shell model are formed to study the effects of initial geometrical defects and the hollow-layered shell formation on th…
Discrete Element Analysis of the Excavation Disturbance of Cross-River Twin-T…
The increasing number of twin-tunnels constructed in river-crossing subway traffic compels the designers to explore its dynamics performance in the excavation progress. The characteristics of particle accelerations of the granular medium in the surroundings are the important factors to reflect the excavation disturbance. In the construction process of the twin-tunnels, the excavation of the sec…
Analytical Solution of Underneath Tunnelling-Induced Deformation of Existing …
Tunnelling underneath the existing tunnels are very common these days. It is obvious that the under-crossing tunnelling will affect and even damage the existing tunnels. An analytical method is proposed in this paper to better understand the effects of the under-crossing tunnelling on the existing tunnel. The existing tunnel is modeled as a Timoshenko beam lying on a Kerr foundation. The validi…
Numerical Analysis of Ground Displacement and Pile Response Due to Tunneling …
The additional pile response due to the creep behavior of the soil is disadvantageous to the safety of pile. However, in the current studies for considering the creep behavior of the soft soil, the pile response induced by the long-term settlement of soil is seldom investigated. This paper mainly discusses the pile response during the excavation and operation periods considering the creep behav…
Defining a "Shallow" Tunnel by Stability Analysis with Dicontinuity Layout Op…
During excavation of NATM tunnel in soft clays, stability problems could arise when the tunnel is too shallow, necessitating special treatment for the surrounding ground such as freezing and jet grouting. However, there is generally no specific rules to help the engineers to determine the critical depth of “shallow” tunnel, which is the dividing line between stably and un…
Numerical Validation of a New Testing Setup for Mechanical Test of Tunnel Lin…
When designing a shield tunnel, there is often a need to carry out mechanical tests on tunnel lining joints to obtain joint stiffness. As tunnel excavation goes deeper, the moment and axial force acting on the lining segments increase, which requires a more rigid backup frame and a stronger foundation for the traditional testing setup. A new testing setup, named as Compression Steel Butterfly…
Study on Moisture Susceptibility of Foamed Mix Asphalt
LOKASI: Ruang Koleksi Umum Rak 3
