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Tunel na trase rychlé železnice / The tunnel on the fast railwayZávacký, Martin January 2016 (has links)
The theme of this thesis is to create a conceptual study of the tunnel on high speed railway. Selection of suitable cross section and tunnelling method with considering of geological conditions of the site. Design of primary support and technological process of construction.
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Katalog der Risiken - Risiken und ihre DarstellungProske, Dirk 24 September 2008 (has links)
Die Welt wird beherrscht durch Veränderung. Von den kleinsten Elementarteilchen bis zu den größten Galaxien kann man ein Entstehen und Vergehen beobachten. Diese Regel schließt auch die lebende Materie mit ein. Wir sehen Bäume wachsen oder das Getreide auf den Feldern reifen und wir müssen erkennen, daß auch wir, die Menschen, diesem Gesetz der Veränderung, dieser Vergänglichkeit unterliegen....
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Development of a Landslide Hazard Rating System for Selected Counties in Northeastern OhioDalqamouni, Ahmad Yousef 07 March 2011 (has links)
No description available.
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Land Use and Landsliding in Price Hill, Cincinnati, OhioAgnello, Tim Joseph 22 May 2002 (has links)
No description available.
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[pt] A INFLUÊNCIA DA ALTERAÇÃO HIDROTERMAL NA ESTABILIDADE DE ESCAVAÇÕES SUBTERRÂNEAS NO RIO DE JANEIRO / [en] THE INFLUENCE OF HYDROTHERMAL ALTERATION IN THE STABILITY UNDERGROUND EXCAVATION IN RIO DE JANEIROJEAN SANTARELLI MONTEIRO DE CASTRO 13 October 2016 (has links)
[pt] Com base nos frequentes relatos de problemas associados à alteração
hidrotermal, durante a escavação de túneis na cidade do Rio de Janeiro, com
destaque para a ação de argilas expansivas e/ou minerais secundários, decidiu-se
estudar profundamente os aspectos petrográficos-genéticos básicos das rochas que
afloram num túnel da região de Jacarepaguá e avaliar até que ponto a influência
da alteração hidrotermal favorece as modificações de resistência dos maciços que
afloram naquela região. Para isso foram realizadas investigações detalhadas das
amostras coletadas dentro do túnel e no bota fora. No laboratório as amostras
foram submetidas à análise petrográfica na lupa e microscópio, análises por
difração de raios-x e ensaio de resistência. Foram estabelecidas correlações entre
as transformações químicas mineralógicas ocorridas nos litotipos que afloram no
túnel com a sua resistência. Com os resultados obtidos foi constatada a
importância da alteração hidrotermal nos projetos de túneis e desta forma pode-se
concluir que pequenas abordagens geológicas podem minimizar vários problemas
de engenharia. / [en] Based on the frequent problems of reports associated with hydrothermal
alteration, during the excavation of tunnels in the city of Rio de Janeiro, especially
the action of swelling clays and/or secondary mineral, it decided to deeply study
the basic aspects petrographic-genetic this rocks appear in the tunnel of
Jacarepaguá region and assess to what extent the influence of hydrothermal
alteration favors changes massive resistance that appear in the region. For that
were conducted detailed investigations of the samples collected in the tunnel and
the slag heap. In the laboratory, the samples were subjected to petrographic
analysis on the magnifying glass and microscope, analysis by diffraction of x-rays
and strength test. Correlations were established between the mineralogical
chemical transformations in rock types that appear in the tunnel with their
resistance. With the results, it was found the importance of hydrothermal
alteration in the projects of tunnels and thus it can be concluded that small
geological approaches can minimize various engineering problems.
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A Preliminary Study On Construction Of A High Capacity Tensiometer And Its Use In Measurement Of Matric Suction In Unsaturated SoilsKoksalan, Ali Okan 01 February 2013 (has links) (PDF)
Soil suction is one of the main state parameters that governs unsaturated soil behaviour. Tensiometers are the only type of probe that can measure soil suction directly, but only up to 90 kPa. In the past two decades, a new type of tensiometer with much greater measurement range (up to 2 MPa) has appeared in the literature. The measurement range (i.e. capacity) of a tensiometer is limited by (i) how well it is saturated, and (ii) the air entry value of its porous interface.
In this study, the first high capacity tensiometer of Turkey was designed and built. For the purpose of increasing the measurement capacity of the tensiometers, a novel saturation setup that uses a hydraulic pressurization system with capacity of 10 MPa was designed and built. A vacuum-and-pressure saturation procedure was developed. To calibrate the 10 MPa pressure transducers that form the core of the tensiometers, a high-pressure calibration setup capable of pressurizing up to 11 MPa was designed and built. By varying designs of tensiometer bodies, porous interfaces and seals, ways of increasing the suction capacity are investigated. Over a dozen tensiometer design variations are developed, and tried by exposing to atmospheric evaporation. A maximum suction measurement of 870 kPa was achieved with a conventional design / however, none of the new designs were successful. 3 successful designs were also briefly tried on soil samples
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Assessment Of Tunnel Induced Deformation Field Through 3-dimensional Numerical Models (necatibey Subway Station, Ankara, Turkey)Akturk, Ozgur 01 October 2010 (has links) (PDF)
In heavily settled areas, deformations induced by the tunnel excavation may cause
serious damage to nearby structures. In this study it is aimed to model ground
deformations induced by main tunnels and connection tunnels excavations as well
as groundwater drainage. Therefore, it is necessary to study effective means of
controlling tunnel induced deformations. The main parameters affecting the
failure and deformation state of the soil around a circular underground opening
are the physical characteristics of the soil, the diameter of the opening, and the
support pressure. During the construction stage of Necatibey Station of KizilayÇ / ayyolu
metro line (Ankara, Turkey), challenging ground conditions involving
highly heterogeneous and locally water saturated foundation soils have been
encountered. Possibility of damage at the surface and/or on the underground
structures can be estimated using finite difference method (FDM) of analysis.
In this study, two geophysical methods namely Electrical Resistivity Imaging
(ERI) and Ground Penetrating Radar (GPR) were utilized to distinguish soil types
at the study area. By correlating these geophysical survey results with the boring
v
logs, 3-Dimensional soil profile was revealed at the study area to build up a basis
for numerical models.
3-Dimensional (3D) FDM analyses were conducted to assess tunneling induced
deformations, along with movements around shallow soft ground main tunnels
and connection tunnels. During sequential excavations, temporary and permanent
shotcrete lining was also simulated. The soil behavior is assumed to be governed
by an elastic-perfectly plastic constitutive relation based on the Mohr&ndash / Coulomb
criterion. The computed deformations around these openings have been compared
with the in-situ measurements. The results of the study revealed that the 3-D
elasto-plastic analyses yield comparably good correlation with the in-situ
measurements. Also, in this study, the effects of main tunnels excavations on each
other and the effects of connection tunnels excavations on main tunnels were
identified in terms of ground deformations. In order to simulate induced surface
settlement due to groundwater withdrawal at the site 3-D fully coupled (fluidmechanical)
numerical models were run using different time durations. The model
studies revealed that deformations monitored at the ground surface are directly
related with the tunnel construction practice. Pumping groundwater has very little
or no effect on the measured deformations.
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Stabilization Of Expansive Clays Using Granulated Blast Furnace Slag (gbfs), Gbfs-lime Combinations And Gbfs CementYazici, Veysel 01 April 2004 (has links) (PDF)
Expansive clays undergo a large swell when they are subjected
to water. Thus, expansive clay is one of the most abundant problems faced in geotechnical engineering applications. It causes heavy damages in structures, especially in water conveyance canals, lined reservoirs, highways, airport runways etc., unless appropriate measures are taken. In this thesis, Granulated Blast Furnace Slag (GBFS), GBFS - Lime combinations and GBFS Cement (GBFSC) were utilized to overcome or to limit the expansion of an artificially prepared
expansive soil sample (Sample A). GBFS and GBFSC were added to Sample A in proportions of 5 to 25 percent. Different GBFS-Lime combinations were added to Sample A by keeping the total addition at 15 percent. Effect of stabilizers on grain size distribution, Atterberg limits, swelling percentage and rate of swell of soil samples were determined. Effect of curing on swelling percentage and rate of swell of soil samples were also determined. Leachate analysis of GBFS, GBFSC and samples stabilized by 25 percent GBFS and GBFSC was
performed. Use of stabilizers successfully decreased the amount of swell while increasing the rate of swell. Curing samples for 7 and 28 days resulted in less swell percentages and higher rate of swell.
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