Research on Ground Settlement Regularity of Soft Rock Tunnel under Ultrasmall Distance

Assessment of Tunnel Excavation on Surface Settlement

The expansion of underground structures is important in urban areas with high population density. In most large cities in the world, urban development is spreading along the structures. These structures are generally located at shallow depth; therefore study of shallow tunnels in urban areas is critical for development. During the excavation of tunnels in urban areas, creating the asymmetric se...

On Thermometer Operation of Ultrasmall Tunnel Junctions

The temperature dependence of the I–V characteristics of many single– electron tunneling devices enable thermometer operation of these systems. We investigate two normal conducting kinds of them, (a) a single junction in a high–impedance environment, and (b) a double junction. The characteristics of both devices show a crossover from Coulomb blockade at low temperatures to ohmic behavior at hig...

Applicability of Elastic Analysis for Predicting the Settlement Distribution Around Tunneling in Soft Ground (TECHNICAL NOTE)

In this article a brief review of the literature on the subject is cited. The method of analysis by a finite element program is discussed in which the effect of different influential parameters are examined. The results of these computations are then compared to the corresponding empirical data and two other existing formulae for two dimensional cases. The comparisons show quite reliable and ac...

Relationship Between Ground Settlement Due to Tunnelling and Ground Physico-mechanical Peroperties (RESEARCH NOTES)

Analytical analysis of ultimate ground pressure on tunnel support system

The ground reaction curve (GRC) is a vital component of the convergence-confinement method, which possesses many applications in the underground space designs. It defines a relation between the tunnel wall deformations and the ground pressure acting on the tunnel walls. Generally, GRC includes descending and ascending branches. According to many researchers, the descending branch trend for the ...