Tracking Shaft Integrity of Jet Grouting Piles Injected in Soft Soil Layers Based on Sonic Integrity Test Method: A Case Study from Erdemli, Mersin Region, South Turkey

Abstract

Many studies have focused on using the non-destructive testing (NDT) method to determine defects in piles. This paper presents an analytical approach that compares the obtained profiles with typical profiles to confirm the integrity of jet grouting column piles using the cast-in-situ Sonic Integrity Testing (SIT) method. In this context, grouting piles are being constructed within the scope of the under-foundation in Erdemli/Mersin Province, Turkey. SIT testing was performed on jet grouting piles by performing integrity tests on piles manufactured, which varied in length according to the field geology and the thickness of the soil layer. These pile tests are performed to determine changes that may occur in the pile's cross-section for various reasons. In the present study (in 2024) SIT was carried out on a total of 148 jet grout piles. In the SIT performed on the piles, at least six records were taken for each pile, the records were examined, and the evaluations and results were given graphically. The cross-sectional alterations and fractures that can be found in the pile cross-section as well as the subsurface soil condition are the outcomes of the integrity tests, and they have an immediate impact on carrying capacity. Based on the acquired data and comparisons with reference profiles, the 148 piles that were produced and examined at the site exhibit no discontinuities or flaws and are structurally intact. By utilizing this method, the necessity for costly on-site soil replacement or foundation handling will be avoided or prevented.