Abstract
The objective of the present study is to understand the behavior of soft soil strengthened by stone columns under dynamic seismic load. Ordinary and encased stone columns were used under different conditions. The present study converges around the dynamic response of stone columns of lateral shaking, the interaction of soil frame for understanding settlement mechanisms and the prediction of dynamic load limitations of foundations in soft soils subjected to seismic load (during vibrations). The results of this research will provide the basis for assessing measures to reduce the severity of seismic hazards and the seismic design of foundation structures in soft soils. As a result, soil models will be tested on the shaking table to make seismic ground vibration under several conditions (frequencies, undrained shear strength of soft soil, for stone columns type both ordinary and encased stone columns). It was concluded that the values of horizontal displacement increase by increasing the loading frequency, as well as the horizontal displacement is faster and greater at 2 Hz than 0.5 and 1 Hz in all cases. The rate of horizontal displacement increases in models on the soil of undrained shear strength cu= 15 kPa is greater than that in undrained shear strength cu= 25 kPa because increasing the strength of the soft soil leads to greater resistance to deformation and a decrease in the level of horizontal displacement.
Highlights
To reduce the problems of soft soils, there are many ways to improve the soil
It is mainly used for fixing soft soils such as soft clays and silty sand.Stone columns are most often used to improve the behavior of soil with undrianed cohesion cu, in range of 15-25 kPa[2]
The current study focuses on the dynamic response of the stone column of lateral shaking, the interaction of soil structure in order to understand the leveling mechanism and prophesy the lateral dynamic of foundations in soft soil below seismic load
Summary
To reduce the problems of soft soils, there are many ways to improve the soil. One of such methods is replacement, sand drains and preloading, lime stabilization, dynamic compaction, and stone or gravel column [1]. Stone columns are considered one of the most important ways to improve weak clay soils as they improve the bearing capacity to bear weak lands and reduce the settlement of the buildings constructed on them in addition to increase the strength of the soil and accelerate the consolidation process and reduce the liquefaction of the soil It is mainly used for fixing soft soils such as soft clays and silty sand.Stone columns are most often used to improve the behavior of soil with undrianed cohesion cu, in range of 15-25 kPa[2]. Fahmiet al.[13]investigated the behavior of the soft soil of 15 kPa shear strength and reinforced with (conventional and geogrid reinforced stone columns) subjected to cyclic loading They used PLAXIS 3D software to check the improved method for using stone columns and field pregnancy exams. The current study focuses on the dynamic response of the stone column of lateral shaking, the interaction of soil structure in order to understand the leveling mechanism and prophesy the lateral dynamic of foundations in soft soil below seismic load (during vibrations)
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