Recent studies have increasingly investigated construction methods for tunnel excavation because of growing underground space development. Although the New Austrian tunneling method (NATM)—a representative method—can be applied to various ground conditions, as well having good constructability and economic feasibility, it suffers from problems such vibration noise. By contrast, using a boring m...

The construction of tunnels in urban areas can affect the nearby existing infrastructures and buildings, as shallow excavations induce movements up to ground surface. An important parameter be monitored during excavation is volume loss, which plays a crucial role determining at InSAR satellite monitoring has potential detect millimetric scale on vast area for tunneling applications. In present ...

In practice, asymmetric formation disturbance occurs due to the sequence of excavation though parallel double-track tunnel is a typical symmetrical engineering. Based on shield tunneling project section Suzhou Rail Transit under subgrade Shanghai–Nanjing Expressway, finite element model was established obtain numerical solution that validated by measured data guarantee reliability. According co...

Knowledge excavation is a new information processing technology. Nowadays, knowledge excavation has been widely applied to the university library management. Knowledge excavation in university library knowledge bases has already been playing an important role in improving the management of university libraries and inevitably will play a more profound role in the future. In this paper, the meani...

In view of the problems associated with poor stability coal walls, slide and leakage top-coal at tunnel excavation working face under a soft extra-thick roof, surrounding rock must be strengthened. The theoretical analysis pressure, numerical simulation other methods were comprehensively used to study coal-wall-slicing mechanism. Given characteristics combined supporting technology “coal wall w...

Tunnel excavation is frequently carried out in rock masses by the drill and blast method and the final shape of the tunnel boundary can be irregular due to overbreaks. In order to investigate the effects of overbreaks a study of the effect of tunnel boundary irregularity has been carried out. This is done developing a computational tool able to take into account fuzzy variables (i.e., thickness...

The aim of the present paper is to investigate the influence of the constitutive model for shotcrete on the predicted displacements and stresses in shotcrete shells of deep tunnels. Previously proposed shotcrete models as well as a new extended damage plasticity model for shotcrete are evaluated in the context of 2D finite element simulations of the excavation of a stretch of a deep tunnel by m...

As mining and civil tunneling progresses to depth, excavation-induced seismicity and rockburst problems increase and cannot be prevented. As an important line of defense, ground control measures and burst-resistant rock support are used to prevent or minimize damage to excavations and thus to enhance workplace safety. Rock support in burst-prone ground differs from conventional rock support whe...

Among various practical measures used for restriction of the ground surface settlement in such tunnels driven in soft ground, selection of an appropriate excavation method plays a significant role. In this paper, employing suggested diagram by Yu & Chern, corresponding values of Niayesh tunnel has been inserted into the diagram. Later, two excavation methods namely: central diaphragm and side d...

The construction of the tunnels Metro Line 4 and Gulou Station in central Nanjing poses a potential threat to nearby historic building, Tower, due relatively small spacing deteriorated structure behaviors. Two aspects are important for protection Tower: (i) reducing soil movement caused by tunnel–station (ii) increasing total stiffness this sensitive building. This research first presents main ...