Underground structures at shallow depths are often constructed for metro lines, either in loose or dense layered soils. Tunnelling in urban areas is predominantly under surface structures and on tunnelling, innumerable changes in the form of distortion take place in strata surrounding the tunnel. Extent of displacement/damage to buildings or the tunnel-soil structure interaction depends on the ...

The design of underground spaces is mainly carried out using empirical, analytical, and numerical methods. The convergence confinement method (CCM) is an analytical technique that is widely utilized in analyzing the stability of underground spaces. However, the main challenge in the stability analysis is the selection of an accurate constitutive model for rock mass, and particularly, its post-f...

Water inflow is one of the most important challenges in the underground excavations. In addition to inducing working conditions and environmental problems, it decreases the stability and quality of the surrounding rocks. The direct method of measuring rock mass hydraulic conductivity consists of drilling the boreholes and observing the rate of fluid lost in the boreholes. Applying this method i...

A study of the underground tunnel planning reliability for megacities is proposed based on use foresight and cognitive modeling methodologies. Using methodology allows, with help expert estimation procedures, to identify critical technologies build alternatives scenarios quantitative characteristics. For justified implementation a particular scenario, used, which allows causal relationships kno...

Digital twin technology can be used for disaster safety management of underground utility tunnels, which are social infrastructures. To verify its efficiency in an tunnel, it must implemented and monitored the real world. Therefore, state information about object position world, change upon movement, should correspondingly reflected digital model. Underground tunnels through closed circuit tele...

In recent years we have seen Wi-Fi move from a “hotspot” model to fuller coverage patterns where connectivity is available everywhere, such as across university and enterprise campuses (recall, for example, the Eduroam service). As people have come to expect more from Wi-Fi of late, there has been concurrent interest in blanketing underground transit systems with wireless coverage, from Transpo...

Ground settlement due to the shallow tunneling in urban areas can have considerable implications for aboveground civilinfrastructures. Engineering geological characteristics of the tunnel host ground including geotechnical parameters of surrounding soil,groundwater situation, and in situ stress condition are amongst the most important factors affecting settlement. In this research, groundsettle...

In this paper, a wireless sensor network (WSN) technology adapted to underground channel conditions is developed, which has important theoretical and practical value for safety monitoring in underground coal mines. According to the characteristics that the space, time and frequency resources of underground tunnel are open, it is proposed to constitute wireless sensor nodes based on multicarrier...

A time-dependent moment tensor inversion technique is applied to 20 seismic events recorded ahead of an advancing tunnel excavation at the Underground Research Laboratory (URL) in Canada. The data are recorded on a 16-sensor triaxial accelerometer array, and the events are chosen from a section of the tunnel such that the event-sensor paths are unaffected by the presence of the tunnel. Factoriz...