Dynamic analysis of a deep excavation supported by anchored piles in Santiago gravel
DOI:
https://doi.org/10.4067/S0718-28132019000100076Keywords:
Numerical modelling, Dynamic analysis, Model HS-Small, Internal forcesAbstract
Discontinuous anchored piling support is one of the most frequently used retaining systems in temporary deep excavations in Santiago, Chile. The system has presented satisfactory behaviour under static and seismic conditions, with negligible deformations. These observations suggest that the design procedures and the local code requirements are conservative and a better understanding of the physical behaviour would lead to optimizing the design methodologies. This paper presents a static and dynamic analysis of a monitored pre-excavated pile-supported deep excavation. A finite element model was developed and calibrated based on static displacement measurements, geophysical and laboratory characterization using the parallel gradation technique. The dynamic responses to earthquake induced lateral pressures, induced internal forces and post-earthquake permanent displacement were studied for a suite of Chilean ground motions, scaled to be representative of current seismic design codes. Based on these results, some conclusions and recommendations on designing procedures are provided.
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