Braced deep excavations are getting widespread in parallel to the increase in the need to use underground spaces for infrastructures and tall buildings which make them an essential part of geotechnical engineering practice. Braced support system movements shall be small enough to ensure remain within acceptable limits. The limits for the elastic displacement of the vertical support member (e.g., pile wall), are generally recommended either for support systems with strut elements or cantilever walls. However, there is no common specification or guide to assess the permissibility of displacements caused by deep excavations with multi‐level anchors. This paper presents an example study for a deep excavation project supported with multilevel anchors in a clayey soil in Istanbul where Mobilized Strength Design (MSD) method is discussed and a new approach is proposed regarding the limit of the horizontal elastic deflection value of the vertical wall with multi‐level anchors, based on a joint evaluation of the performed finite element study and MSD method.
This paper presents a study performed to examine the applicability and convenience of the random set theory in combination with the finite element method (RS‐FEM), considering a case of a deep excavation. A case history of a 15 m deep multi‐anchored contiguous pile wall in clay is considered. Existing buildings around the excavation have necessitated a careful evaluation on the deformations and the reliability of the system. However, due to the existence of limited investigations, the soil parameters had to be estimated combining the results of these investigations with previous experience and expertness under similar conditions. Plane strain numerical analyses have been performed in order to predict the wall behavior. The parameters in the random set model have been chosen based on the sensitivity analyses. Most probable boundaries of the wall horizontal deformations have been compared with inclinometer readings. As suggested by previous case histories, wall deformations have been observed to fall within the lower third of the range predicted by RS‐FEM.
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