محمدامير نوروزي مباركه

The response of soil foundations reinforced with multi-layer geocell systems, which reinforce machine foundations, is investigated through three-dimensional modeling in FLAC3D software. The model involves the vertical vibration of a square concrete footing (400 × 400 mm) resting on unreinforced soil an‎d soil reinforced with one, two, an‎d three geocell layers. The simulations are conducted under two different vibrational moments (two time-variable loads) an‎d three static loads (gravitational force from the total weight of the system, such as concrete blocks an‎d machinery installed on the footing) using coding in FLAC3D software. The vibrational responses are examined in terms of dynamic displacement an‎d frequency. The results indicate that the maximum dynamic displacement amplitude significantly decreases in the presence of geocell reinforcement, while the systemʹs natural frequency increases. Within the applied vibrational load an‎d frequency range, the greatest improvement (i.e., the highest reduction in vibration amplitude) was observed with the three-layer geocell reinforcement. However, since the rate of improvement (the speed of maximum amplitude reduction) continuously decreases with an increasing number of geocell layers, a higher number of geocell layers will yield diminishing returns. The optimal depth for placing the first geocell layer an‎d the vertical spacing between geocell layers were adopted from previous studies. After validation with laboratory results within a specific frequency range, the effects of various other parameters on the systemʹs dynamic displacement an‎d natural frequency (resonant frequency) are investigated. The parameters eva‎luated include: changing the shape of geocell pockets to two geometric forms, rhombus an‎d hexagon (real shape); changing the infill soil of the geocell an‎d the trench soil (san‎d, slag, an‎d construction waste); an‎d the effects of increasing the number of geocell layers, footing weight, an‎d dynamic load variation on these soils. It was observed that increasing the number of geocell layers, reducing the geocell pocket size, an‎d increasing the footing weight lead to an increase in the systemʹs natural frequency an‎d a decrease in dynamic displacement. Furthermore, accurate modeling of the geocell pocket shape has a significant impact on the results. For different soils, the maximum dynamic displacement amplitude in the unreinforced state, which ranged from 0.552 mm to 0.62 mm, decreased to the range of 0.32 mm to 0.32 mm for the single-layer geocell reinforcement, to the range of 0.23 mm to 0.26 mm for the two-layer reinforcement, an‎d to the range of 0.204 mm to 0.225 mm for the three-layer geocell reinforcement.

پي ماشين آلات , ژئوسل

Machine foundation , Geocell

Mohamad Amir Noruzi Mobarake

Hamid Reza Razeghi