Akademik Veri Yönetim Sistemi
PROF. DR. IN HONOR OF FEYZA ÇİNİCİOĞLU FROM THEORY TO APPLICATION GEOTECHNICAL ENGINEERING SYMPOSIUM, İstanbul, Türkiye, 10 Mayıs 2018, ss.86-91
This paper presents the results of a pre- and post- installation cone penetration test results used
for the purpose of liquefaction mitigation by Impact® Rammed Aggregate Piers® (RAP) constructed in a nonhomogenous
fill layer to the depth of 16 m. The improvements provided by Impact® RAP elements to mitigate
liquefaction potential include: i) soil densification ii) transferring a major portion of the seismically induced
shear stresses from the soil to columns iii) increasing the horizontal stress of the surrounding soil iv)
dissipation of excess pore water pressure. In the case history presented in this paper, Impact® RAP elements
were installed in a square and triangular pattern with 1,5 m and 1,7 m on-center spacing, respectively. CPT
testing was performed before and after the installation of the piers. The results show that the additional densification
and improvement in non-cohesive soils due to vibration and volumetric densification during the pier
construction has increased the safety factor against liquefaction by 2,5-3,0 times.