Numerical evaluation on the performance of deep excavation with the strut-free retaining system in clays
Numerical evaluation on the performance of deep excavation with the strut-free retaining system in clays
This paper aims to evaluate the performance of a novel strut-free excavation system in clays using three-dimensional finite element analyses. This system typically consists of the diaphragm wall, buttress wall, cross wall, and capping slab. The results revealed that the installation of the buttress wall would provide additional frictional and bearing resistance, which could enhance the overall stability. On the other hand, implementing the cross wall would cause the failure surface to extend far behind and below the diaphragm wall, resulting in a significant increase in the factor of safety. In addition, a new schematic of a strut-free excavation system was proposed by combining buttress wall and ground improvement, which can be used as an alternative and innovative solution for deep excavation design. Based on these findings, a new simplified method was proposed to assess the factor of safety for a strut-free excavation system with a buttress wall, cross wall, and ground improvement.
Keywords: Buttress wall; Cross wall; Deep excavation; Factor of safety; Ground improvement
ari Surya abdi; Chang-Yu Ou
10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)
8. Excavations and retaining structures
https://doi.org/10.53243/NUMGE2023-24
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