Monitoring ground deformation in tunnelling: Current practice in transportation tunnels

Kavvadas, Michael

doi:10.1016/j.enggeo.2004.10.011

Cited by 109 publications

(40 citation statements)

References 8 publications

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“…A exploração de medidas de deformação é compatível com modernos métodos de projeto de túnel que incluem um conjunto de sistemas de escavação e suporte para cobrir o espectro esperado de condições ao longo do túnel. A seleção do sistema aplicável durante a escavação do túnel baseia-se na geologia encontrada na face do túnel, bem como na experiência das seções de túnel previamente escavadas em condições semelhantes, obtidas por medições de deformação apropriada (KAVVADAS, 2005).…”

Section: -Introduçãounclassified

Contribuição à análise da capacidade de suporte em apoios de túneis escavados em solo

Garcia¹,

Albuquerque²,

Melo³

2017

Cieng

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A capacidade de suporte de fundações apoiadas em solo depende de diversos fatores, tais como: forma da fundação, profundidade de embutimento, inclinações da carga aplicada, dimensões da base e tipo de terreno. Nas escavações de túneis, o apoio da cambota distribui as tensões provenientes do maciço e dos revestimentos primários diretamente ao solo. Nestes apoios, é comum o corte horizontal do terreno, mantendo-se a base da cambota inclinada por um elemento pré-moldado de concreto que posteriormente é preenchido com concreto projetado. Por outro lado, em alguns casos, os projetos são elaborados e analisados numericamente com apoio plano inclinado, divergindo da prática construtiva. Assim, são analisados neste trabalho, pela proposta de Hansen (1961) e modelagem numérica, os efeitos da inclinação do terreno no dimensionamento e no comportamento dos apoios de túneis escavados em solo. Os resultados revelaram que a inclinação do corte do terreno influencia na capacidade de carga e na forma como ocorrem as solicitações no maciço. Apoios inclinados permitem que a distribuição das tensões ocorra externamente à seção do túnel e consequentemente apresentem maior capacidade de carga. Portanto, é imprescindível que as análises numéricas sejam fidedignas às etapas construtivas da forma como será executado. Palavras-chave: Túneis em solo. Capacidade de Suporte. Modelagem numérica. ABSTRACTThe bearing capacity of foundations supported on soil depends on various factors such as shape of the foundation, depth of embedding, inclination of the load applied, base dimensions and type of soil. In excavations of tunnels, the camshaft support distributes stresses from the massif and from primary coatings directly to the soil. In these supports, a horizontal cut of the terrain is usual, and the base of the camshaft is kept at an angle by a pre-cast concrete element which is later filled with sprayed concrete. On the other hand, in some cases the projects are developed and analyzed numerically with a flat inclined support, which diverges from the common building practice. In this sense, the effects of terrain inclination in dimensioning and behavior of supports of tunnels excavated in soil are analyzed in this work by means of the proposal of Brinch Hansen and also via numerical modeling. The results showed that the inclination of the cut of the terrain influences the load capacity as well as the way stresses in the massif take place. Inclined supports allow stresses to be distributed externally to the tunnel section and, as a consequence, they have a greater load capacity. Therefore, it is critical for numerical analyses to be consistent with the building stages as they will be built. Keywords: Tunnels in soil. Bearing capacity. Numerical modeling. -INTRODUÇÃOO crescimento populacional das grandes cidades desafia a engenharia civil e no caso deste trabalho a engenharia geotécnica, em propor soluções eficientes e sustentáveis sob o aspecto da fluidez urbana.O principal motivo é a falta de espaço na superfície nas principais cidades, junt...

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Section: -Introduçãounclassified

Contribuição à análise da capacidade de suporte em apoios de túneis escavados em solo

Garcia¹,

Albuquerque²,

Melo³

2017

Cieng

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“…Today, the state-of-the-art in settlement or deformation monitoring relies on classical terrestrial measurement methods and devices, for example water level gauges, levelling or measurements with tachymeters (Kavvadas 2005). The high accuracy and very short measuring intervals of terrestrial methods still make them unsurpassed.…”

Section: Current Practice Of Settlement Monitoring In Tunnellingmentioning

confidence: 99%

“…Of the latter point, several very precise terrestrial measurement methods representing the state-of-the-art are available, nevertheless, these procedures are time and material consuming. Additionally, to implement these procedures it is necessary to install and operate instruments on-site in or at buildings over a long time period (Kavvadas 2005; Van der Poel et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Radar interferometry based settlement monitoring in tunnelling: Visualisation and accuracy analyses

et al. 2016

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Background: The accurate, efficient and economical monitoring of settlements caused by tunnel boring machines, especially in regions of particular interest such as critical inner city areas, has become an important aspect of the tunnelling operation. Besides conventional terrestrial based methods to capture settlements, satellite based techniques that can accurately determine displacements remotely, are increasingly being used to augment standard terrestrial measurements. However, not much attention has been paid to analyse the accuracy of satellite based measurement data. In addition, there is also a lack of studies on how to visualise the resulting huge amount of data in the context of both the tunnel advancement and the existing building infrastructure.

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“…Depending on rock mass properties, these instruments can be used in distances ranging from 5 to 50 m [12,13]. Precise engineering and monitoring of boring behavior during and after tunnel construction provide the best strategy for judging tunnel stability in a realistic manner [14].…”

Section: Cross Section and Behavior Assessment Of Chehel Chay Water Cmentioning

confidence: 99%

A convergence criterion for water conveyance tunnels

Zarei¹,

Ahangari

Ghaemi

et al. 2017

Innov. Infrastruct. Solut.

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One of the important methods used by tunnel construction engineers to examine the design, construction safety factor, and tunnel boring procedures is convergence measurement. Larger convergences may lead to safety problems such as rock destruction, boring machines jamming, delays in projects, or even geological disasters, in which case convergence measurement is considered the best method. The goal of this research is introducing a new convergence criterion for water conveyance tunnel based on the data from 31 convergence measurement stations of the Chehel Chay water conveyance tunnel. To achieve this objective, three different methods including statistical (SPSS), artificial neural network (ANN) and numerical modeling (3DEC) have been used. Observation points are defined on the tunnel wall in a realistic numerical modeling to compare the convergence results. The results revealed the success of the artificial neural network and indicated that the network managed to estimate the test data with a high correlation coefficient.

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Monitoring ground deformation in tunnelling: Current practice in transportation tunnels

Cited by 109 publications

References 8 publications

Contribuição à análise da capacidade de suporte em apoios de túneis escavados em solo

Contribuição à análise da capacidade de suporte em apoios de túneis escavados em solo

Radar interferometry based settlement monitoring in tunnelling: Visualisation and accuracy analyses

A convergence criterion for water conveyance tunnels

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