Effect of distribution pattern of DSM columns on the efficiency of liquefaction mitigation

H. DehqanKhalili, A. Ghalandarzadeh, M. Moradi, R. Karimzadeh
2019 Scientia Iranica. International Journal of Science and Technology  
Liquefaction during earthquakes can result in severe damage to structures, primarily from excess pore water pressure generation and subsoil softening. Deep Soil Mixing (DSM) is a common method of soil improvement and is also used to reduce shear stress in lique able soils to control liquefaction. The current study evaluated the e ect of DSM columns and the implementation of di erent column patterns on controlling liquefaction and decreasing settlement of shallow foundations. A series of shaking
more » ... A series of shaking table physical modeling tests were conducted for three di erent distribution patterns of DSM columns (i.e., square, triangular, and single) with a treatment area ratio of 30%. The treatment was applied to a lique able soil under a shallow model foundation. The results showed that the excess pore water pressure decreased by 20% to 50% in comparison with the unimproved soil, depending on the DSM column pattern used. For improved soil, the shallow foundation settlement was about 10% more than that of the unimproved soil in the best case. Increase in soil shear sti ness after the use of the DSM columns was compared with the results of existing practical relations to increase soil shear strength.
doi:10.24200/sci.2019.21647 fatcat:u7tlgbisijcejo5q6nx6f54pxe