Temporal effective stress response of soil elements below the base of an excavation in sensitive clay
Artikel i vetenskaplig tidskrift, 2024

Investigations into the temporally evolving stress state below the base of excavations and underground structures are very scarce, in contrast to studies of horizontal earth pressures during the construction stage. Therefore in this work, the measured temporal response in terms of vertical and horizontal effective stresses and displacements below a tunnel slab at the base of an excavation located in a deep sensitive clay deposit is reported. In addition to the measured unloading response over time, the completeness of the site description and complementary measurements enables future benchmarking of numerical models at boundary and element level. Instrument clusters of earth pressure cells and piezometers were installed at three locations in one cross-section. The monitoring data allows the interpretation of effective stress paths and stress ratios, K=σ'h/σ'v, at soil element level covering the construction and the serviceability stages. The in situ stress ratios enable a unique comparison to prior laboratory studies of K during unloading. The data presented herein on the evolution of K corroborate, although approximately, previous studies at laboratory scale. Furthermore, at system level, the monitoring data reveal the intricate interplay between deformations resulting from excavation and pile driving.

excavation

heave

instrumentation

earth pressure

soft clay

Författare

Johannes Tornborg

Chalmers, Arkitektur och samhällsbyggnadsteknik, Geologi och geoteknik

Mats Karlsson

Chalmers, Arkitektur och samhällsbyggnadsteknik, Geologi och geoteknik

Jelke Dijkstra

Chalmers, Arkitektur och samhällsbyggnadsteknik, Geologi och geoteknik

Canadian Geotechnical Journal

0008-3674 (ISSN) 1208-6010 (eISSN)

Vol. 61 11 2571-2587

Rate-dependent response of excavations and permanent underground structures

Digital Twin Cities Centre, 2021-05-01 -- 2024-06-15.

Trafikverket (TRV2021/27782), 2021-05-01 -- 2024-06-15.

Digital Twin Cities Centre

VINNOVA (2019-00041), 2020-02-29 -- 2024-12-31.

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Chalmers, 2018-08-01 -- .

Effektiva beräkningsmodeller för hållbar användning av djupstabilisering i stadsmiljö

Formas (2019-00456), 2020-01-01 -- 2022-12-31.

Drivkrafter

Hållbar utveckling

Styrkeområden

Transport

Ämneskategorier

Geoteknik

DOI

10.1139/cgj-2023-0355

Mer information

Senast uppdaterat

2024-11-22