Assessment of CPT Data on Liquefaction Mitigation with Rammed Aggregate Piers® (RAP) (In turkish)


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Berilgen M. M.

PROF. DR. IN HONOR OF FEYZA ÇİNİCİOĞLU FROM THEORY TO APPLICATION GEOTECHNICAL ENGINEERING SYMPOSIUM, İstanbul, Turkey, 10 May 2018, pp.86-91

  • Publication Type: Conference Paper / Full Text
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.86-91

Abstract

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.