Investigating the effect of saturated sand layer thickness on the performance of deep soil mixing columns and gravel columns in reducing risks caused by liquefaction

Authors

1 Urmia University, Urmia, Iran

2 Department of Civil Engineering, Urmia University, Urmia, Iran

Abstract

The soil may not always have the engineering characteristics required for the construction of structures or underground facilities, including the phenomenon of liquefaction, which is one of the most destructive geotechnical phenomena and causes heavy damage to vital structures. it is necessary to improve the site and solve the geotechnical problem. Among ground improvement methods dealing with liquefaction, gravel drain columns and deep soil mixing columns are popular. In this study, the results of a series of seismic experiments in a 1g environment on a structure located over liquefiable ground with different thicknesses reinforced with GD and DSM techniques were presented. The dynamic response of the reinforced ground system was investigated based on the parameters of settlement, excess pore water pressure ratio, maximum acceleration, Stress and strain behavior, and shear stiffness. The time history of the input acceleration was applied harmonically with an acceleration range of 0.2g and at frequencies of 1, 2, and 3 Hz. The results show that the thickness of the liquefiable layer and the frequency of the input motion have a significant impact on the effectiveness of the improvement method and all responses. Among the two techniques used, DSM in thick liquefied layers was much more efficient than GD in controlling the subsidence and rupture of the soil under the foundation. Maximum settlement values in the thicker liquefied layer at the 1-Hz input frequency were higher than at other frequencies. At low thicknesses, the dynamic behavior of the GD was closer to that of the DSM.

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Journal of Civil and Environmental Engineering

Articles in Press, Accepted Manuscript
Available Online from 07 June 2023

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