Deep enclosures versus pumping to reduce settlements during shaft excavations

Pujades, Estanislao; Vàzquez-Suñé, Enric; Carrera, Jesús; Vilarrasa, Víctor; Simone, Silvia De; Jurado, Anna; Ledesma, Alberto; Ramos, Gonzalo; Lloret, A.

doi:10.1016/j.enggeo.2013.11.017

Cited by 76 publications

(39 citation statements)

References 45 publications

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“…But the net effect was a significant increase in the OCR in all the 10 sediments. As a result, pumping settlements should be small and the soil should behave 11 elastically in response to groundwater oscillations when these are smaller than the maximum 12 drawdown caused in the past (Pujades, et al, 2014a(Pujades, et al, , 2014b. Groundwater fluctuations larger 13 than the maximum historical drawdown would cause unrecoverable movements.…”

Section: Soil Overconsolidation 5mentioning

confidence: 99%

“…Settlements were 13 computed by assuming a value of S S of 10 -5 m -1 , derived from the pumping tests performed 14 during the construction. Although this methodology assumes exclusively vertical movements, 15 which is not always the case, it allows us to approximate the displacements with an acceptable 16 error (Pujades et al, 2014a). 17…”

Section: Soil Displacement Predictions 22mentioning

confidence: 99%

“…The other pumpings were not detected since they were performed inside the enclosure, which 24 had been deepened more than was structurally necessary (using jet-grouting piles) because of 1 the fears caused by the pumping settlements (Pujades et al, 2014a). 2…”

Section: Soil Displacement Predictions 22mentioning

confidence: 99%

“…Fine materials are related to transgression 12 events and coarse sediments to regression events. The Pliocene is affected by faults, one of 13 which is located in the Cartagena street (Figure 3 tunnel project and other projects developed in Barcelona (Pujades et al, 2014a(Pujades et al, , 2014b. 3 4 2.3.2.…”

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confidence: 99%

“…The hydraulic parameters of the aquifer were obtained from these tests (Pujades et al, 2014a), 14 that were interpreted using the finite element code TRANSIN-IV Carrera, 1996, 15 2003;Medina et al, 2000) with visual interface of VISUAL TRANSIN (UPC, 2003). The 16 code performs automatic estimation (also termed inverse problem or back analysis) using the 17 Levenberg-Marquardt algorithm (Carrera and Neuman 1986a, 1986b, 1986c.…”

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confidence: 99%

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Hydrogeological impact assessment by tunnelling at sites of high sensitivity

Pujades

Vàzquez-Suñé

Culí

et al. 2015

Engineering Geology

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hydrogeological impacts of the construction were raised. These concerns were addressed 8 during the design stage to forestall any unexpected events. The methodology consisted of 1) 9 characterising the geology in detail, 2) predicting the impacts caused in the aquifer, 3) 10 predicting the soil displacements due to water table oscillations produced by the construction, 11 and 4) monitoring the evolution of groundwater and soil settlements. The main estimated 12 impact on groundwater was a moderate barrier effect. The barrier effect, the magnitude of 13 which matched the predictions, was detected during construction. The monitoring of soil 14 settlements revealed short and long term movements. The latter movements matched the 15 analytical predictions of soil displacements caused by the groundwater oscillations. 16 This paper proposes a realistic procedure to estimate impacts on groundwater during tunnel 17 construction with an EPB. Our methodology will considerably improve the construction of 18 tunnels in urban areas. 19

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Section: Soil Overconsolidation 5mentioning

confidence: 99%

Section: Soil Displacement Predictions 22mentioning

confidence: 99%

Section: Soil Displacement Predictions 22mentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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