Strategies in tunnel design, construction, maintenance, inspection and operations

2011 ◽  
pp. 265-274
Author(s):  
H Capers ◽  
L Jiang ◽  
K Thompson
Keyword(s):  
Tunnel Design ◽  
Design Construction

Tunnelling in Brasília porous clay

1996 ◽  
Vol 33 (4) ◽  
pp. 565-573 ◽  
Author(s):  
J AR Ortigao ◽  
R Kochen ◽  
M M Farias ◽  
A P Assis
Keyword(s):  
Field Measurements ◽  
Residual Soils ◽  
Tunnel Face ◽  
Tunnel Design ◽  
Tunnel Diameter ◽  
Underground Transportation ◽  
Surface Settlements ◽  
Horizontal Displacements ◽  
Design Construction

The Brasília underground transportation system comprises 6.5 km of shallow tunnel excavated in a soft red soil known as porous clay that overlies harder residual soils. The tunnel diameter is 9.6 m. Settlement observations indicated that surface settlements were two to three fold the initially predicted value, although no indication of excavation instability was observed. Settlements reached, at one section, 500 mm without failure. Another striking feature was settlement amplification between the top of the excavation and the surface by a factor that averaged 1.2 but reached up to 4. This occured because of the collapsible nature of the porous clay, which presented a considerable reduction of volume as the tunnel face advanced. This paper describes tunnel design, construction, and instrumentation; and summarizes geology and soil properties from in situ and laboratory tests. Field measurements of settlements and horizontal displacements are described and analysed. The main cause of the large settlements was collapse of the porous clay structure. Key words: tunnelling, porous clay, settlements, collapse.

DISCUSSION OF PAPERS 6831 AND 6826. CLYDE TUNNEL: DESIGN, CONSTRUCTION AND TUNNEL SERVICES. CONSTRUCTIONAL PROBLEMS.

1967 ◽  
Vol 37 (3) ◽  
pp. 511-535
Author(s):  
H D MORGAN ◽  
A F HAXTON ◽  
J C HICKES ◽  
D N WALDER ◽  
R W HIGGINBOTHAM ◽  
...  
Keyword(s):  
Tunnel Design ◽  
Design Construction

scholarly journals Route Planning and Tunnel Design & Construction of Sinkansen in the Shirasu Area.

2001 ◽  
Vol 42 (2) ◽  
pp. 123-130
Author(s):  
Hiroshi OHSHIMA ◽  
Yuji MATSUMOTO ◽  
Manabu ICHIHASHI ◽  
Hiroshi KAKIHARA
Keyword(s):  
Route Planning ◽  
Tunnel Design ◽  
Design Construction

scholarly journals APPLICATION OF ELECTRIC EXPLORATION AND ATMOGEOCHEMICAL TECHNOLOGIES IN SEISMIC MICROZONING OF A TUNNEL JUNCTION THROUGH THE MARKOTKH RIDGE

2020 ◽  
Vol 12 (4) ◽  
pp. 542-554
Author(s):  
Nikolay FOMENKO ◽  
◽  
Natalia BOROVIK ◽  
Dmitriy GAPONOV ◽  
Ludmila FOMENKO ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Electric Field ◽  
Field Measurements ◽  
Field Studies ◽  
Crossing Over ◽  
Geophysical Research ◽  
Seismic Microzoning ◽  
Tunnel Design ◽  
The Right ◽  
Design Construction

Aim. Investigation of the electrical exploration effectiveness and atmogeochemical technologies for detecting discontinuous and folded tectonic disturbances during seismic microzoning of the tunnel crossing over the "Markotkhsky ridge" Task. Study of the tectonic disturbance degree and flooding of the flysch strata using spatial electrical filtration, electropotential tomographic sensing, and atmogeochemical measurements along the tunnel route using data from route surveys and drilling at the tunnel design site. Research methods. 1) Field electrical survey measurements of spatial electrical filtration and electropotential tomographic sensing and with installations of multidirectional electric field excitation for" highlighting " target objects. 2) Using a multi-variant system for presenting field data in the form of tomograms and in the form of electro-profiling and sounding to identify destructive zones related to tectonically disturbed rocks and flood zones. Research results. The analysis of domestic and foreign publications on the use of electrical exploration methods in seismic microdistricting of design, construction and operation of critical facilities is performed. On the example of a tunnel crossing over the Markotkhski ridge: 1) geological, geo-ecological, and seismological characteristics of the area of engineering and geophysical research are considered; 2) the field studies of spatial technologies electric filtrazione, electropotentials tomographic probing and atmogeochemical of observations are produced; 3) the heterogeneity of fliteway thickness laterally and quasioperational this thickness on the electrical properties at depth is shown; 4) as a result poperechnogo analysis curves electropotentials tomographic probing, as well as charts of the spatial electric filtrational and atmogeochemical measurements of an tectonically disturbed and watery areas are identified; 5) the degree of differentiation of the flysch thickness by the values of the specific electrical resistance was estimated using a pseudo-section constructed in the Res2Dinv program. Conclusions. The technologies of electropotential tomographic sounding and spatial electric filtration are unique in terms of mobility and simplicity of field measurements, subsequent geological and geophysical interpretation of anomalous values of the electric field based on its redistribution in tectonically and technogenically disturbed geological structures. The result is the identification of places of development of tectonic discontinuities and watered zones, information about which makes it possible to predict, along with the seismicity of the rock mass inside the tunnel, possible places of potential collapse and flooding during the design, construction and subsequent operation of tunnel crossings. A significant achievement of the experiments can be attributed to the identification of the possibility of electroprobing the flysch strata with steeply-and obliquely-lying layers by dipole electric exploration installations. The proof is that the growth of the right branches of the probing curves does not exceed 45°. Consequently, the steeply-and obliquely-lying flysch strata can be considered heterogeneous laterally and quasihomogeneous in depth in terms of electrical properties.

Discuss of Express Tunnel Design in Poor Geology Area

2012 ◽  
Vol 430-432 ◽  
pp. 1602-1605
Author(s):  
He Lin Fu ◽  
Wen Bin Lu ◽  
Yu Wu He ◽  
Da Ren Ouyang
Keyword(s):  
Highway Construction ◽  
Tunnel Design ◽  
Design Construction ◽  
Design And Construction

Combined with Poor geology problem during Express highway construction in Hunan Express, some measures for design, construction has been put forward. The Author’s aim is to provide some useful reference for tunnel design and construction.

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