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tunnel vault

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tunnel vault

[′tən·əl ‚vȯlt]
(architecture)
barrel vault
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

barrel vault, barrel roof, cradle vault, tunnel vault, wagonhead vault, wagon vault

A masonry vault of plain, semicircular cross section, supported by parallel walls or arcades and adapted to longitudinal areas.

tunnel vault

A vault having a uniform cross section everywhere.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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References in periodicals archive
(4) Due to the relative lagging nature of the on-site support process, the settlement and convergence of the tunnel vault on-site were larger than the simulation results by 1 to 2 mm.
(3) Compared with the horizontal displacement, the vertical displacement of the surrounding rock around the tunnel was greater, and the maximum vertical settlement of 4.6 mm appeared at the tunnel vault. The settlement of the tunnel arch (right) was larger than that of the left arch, and it proved that the left retaining wall support structure contributed a restraining effect to the vertical displacement.
Stability Analysis of Surrounding Rock and Treatment Structures in Superlarge Karst Cave of Naqiu Tunnel
In this section, the time histories of the sectional forces of lining at 45[degrees] of the lining section (the zero section corresponds to the apex of the trigonometric circle, located at the right side of the tunnel lining) and the lining distortion (relative horizontal displacement between the tunnel vault and invert) are obtained for different earthquake specifications.
the relative horizontal displacement between tunnel vault and invert) equals to 5 cm, under the primary Loma-Prieta earthquake with [T.sub.P]/T = 0.31 and S[V.sub.max]/PGV = 3.74, which is equivalent to Type-C pulse and the lower values by the Northridge and Cape - Mendocino earthquakes (equaling to 3.5 in the former and 3 cm in the latter) with [T.sub.P]/T = 0.69 and 1.74 and S[V.sub.max]/PGV = 2.23 and 2.41, respectively.
In addition, as a result of increasing stresses at the tunnel vault and the invert due to redistribution of soil stress and loss of the effect of tunnel construction sequence followed by applying earthquake, the soil shear strength and frictional interaction between the soil and the tunnel lining increase.
Analysis of cylindrical tunnels under combined primary near fault seismic excitations and subsequent reverse fault rupture
This is well justified by the fault rupture bifurcation and the associated diffusion of plastic shear strain to the tunnel vault and invert.
For FW3D and FW5D cases, by increasing fault dip angle indifferent earthquake magnitudes, there was almost no displacement at the tunnel vault and the invert.
Table 4 The displacements of the tunnel vault under reverse fault rupture -cm.
Behavior of circular tunnels crossing active faults
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