The influence of parameter variability on subsidence
Paper in proceeding, 2023

Leakage into rock tunnels covered by thick soft clay deposits may cause a pore water pressure drop over large areas through underdrainage, resulting in settlement problems and potential damage to structures. In urban areas, heterogeneity in soil properties can be substantial. In this paper, a case study with a systematic sensitivity analysis combined with coupled hydro-mechanical finite element analyses was performed for three key parameters (overconsolidation ratio, vertical hydraulic conductivity and hydraulic anisotropy) considering one scenario of underdrainage. The results show that both the magnitude and uncertainty of settlements are strongly stratigraphy-dependent. The overconsolidation ratio contributed the most to the settlement uncertainty and the effect of vertical hydraulic conductivity was also found to be significant, while the changes in hydraulic anisotropy had negligible influence.

Subsidence

Sensitivity analysis

Underdrainage

Soft clay

Author

Pierre Wikby

Geology and Geotechnics 2

Ayman Abed

Chalmers, Architecture and Civil Engineering, Geology and Geotechnics

Mats Karlsson

Chalmers, Architecture and Civil Engineering, Geology and Geotechnics

Jonas Sundell

Chalmers, Architecture and Civil Engineering, Geology and Geotechnics

Minna Karstunen

Chalmers, Architecture and Civil Engineering, Geology and Geotechnics

10th European Conference on Numerical Methods in Geotechnical Engineering

1-6

10th European Conference on Numerical Methods in Geotechnical Engineering
London, United Kingdom,

Digital Twin Cities Centre

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

Modellering av tidsberoende grundvattensänkning, markdeformationer och dess skaderisker

Swedish Transport Administration (TRV2020/54637), 2020-09-01 -- 2023-08-31.

Swedish Transport Administration (TRV2020/54637), 2023-10-01 -- 2025-12-19.

Subject Categories

Geotechnical Engineering

Transport Systems and Logistics

Water Engineering

DOI

10.53243/NUMGE2023-325

More information

Latest update

12/14/2023