Safety provision in the construction of a two-track subway tunnel in quaternary deposits

2019 ◽  
Vol 3 ◽  
pp. 88-96
Author(s):  
M.O. Lebedev ◽  
2021 ◽  
Vol 194 ◽  
pp. 107657
Author(s):  
Peng Zhao ◽  
Xiaozhao Li ◽  
Jiajun Liu ◽  
Donghai Zhang ◽  
Hengjun Qiao

1955 ◽  
Vol 20 (2) ◽  
pp. 131-154 ◽  
Author(s):  
R. G. West ◽  
C. M. B. McBurney

The long history of investigations at Hoxne, Suffolk, beginning when John Frere discovered Palaeolithic implements there in the last decade of the eighteenth century, has been described by Moir. Moir himself worked on the deposits at Hoxne, and the results of his investigations, together with those of Reid, have formed the basis for our knowledge of the geology and archaeology of the deposits. From these investigations it is clear that Hoxne is an important site, for it is one of the rare places where there are interglacial lake deposits and Palaeolithic implements in direct association with ground moraines of the older glaciations. Moreover, the deposits occupy a well-known position in the East Anglian Quaternary succession.


2013 ◽  
Vol 319 ◽  
pp. 599-604
Author(s):  
Makhsuda Juraeva ◽  
Kyung Jin Ryu ◽  
Sang Hyun Jeong ◽  
Dong Joo Song

A computational model of existing Seoul subway tunnelwas analyzed in this research. The computational model was comprised of one natural ventilationshaft, two mechanical ventilationshafts, one mechanical airsupply, a twin-track tunnel, and a train. Understanding the flow pattern of the train-induced airflow in the tunnel was necessary to improve ventilation performance. The research objective wasto improve the air quality in the tunnel by investigating train-induced airflow in the twin-track subway tunnel numerically. The numerical analysis characterized the aerodynamic behavior and performance of the ventilation system by solving three-dimensional turbulent Reynolds-averaged Navier-Stokes equations. ANSYS CFX software was used for the computations. The ventilation and aerodynamic characteristics in the tunnel were investigated by analyzing the mass flowrateat the exits of the ventilation mechanicalshafts. As the train passed the mechanical ventilation shafts, the amount of discharged-air in the ventilationshafts decreased rapidly. The air at the exits of the ventilation shafts was gradually recovered with time, after the train passed the ventilation shafts. The developed mechanical air-supply for discharging dusty air and supplying clean airwas investigated.The computational results showed that the developed mechanical air-supplycould improve the air quality in the tunnel.


2014 ◽  
Vol 74 (2) ◽  
pp. 1007-1020 ◽  
Author(s):  
Zhen-Dong Cui ◽  
Shi-Xi Ren

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