'Real-time' back analysis of a shaft excavation in London Clay using the propped contiguous piled wall
'Real-time' back analysis of a shaft excavation in London Clay using the propped contiguous piled wall
A square shaft excavation in the over-consolidated London Clay was supported by the contiguous piled wall with multiple levels of temporary props. The 3D finite element model was adopted for design analyses. During the shaft construction, the real-time back analyses were trialled by 2D finite element models on DAARWIN® - a data platform that uses the machine learning algorithm to conduct back analyses. Challenges encountered in the back analyses trial com-prise: i) 2D modelling versus actual 3D excavation behaviour; ii) the exposed London Clay surface induced by contiguous piled-wall; iii) review and implementation of the reliable monitoring data in relation to the as-built construction activities; and iv) interpretation of the back analysis outcome. This paper discusses these challenges and proposed solutions and also presents the calibrated best-estimated London Clay stiffness values in deep excavation with a less stiff retaining wall system.
Ying Chen
10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)
8. Excavations and retaining structures
https://doi.org/10.53243/NUMGE2023-170
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