Preliminary communication

Estimation of vibro replacement by compression seismic waves

Mario Gazdek orcid.org/0000-0001-9204-5350 ; Sveučilište u Zagrebu, Geotehnički fakultet, Hallerova aleja 7, 42000 Varaždin, Hrvatska
Stjepan Strelec orcid.org/0000-0001-6644-6900 ; Sveučilište u Zagrebu, Geotehnički fakultet, Hallerova aleja 7, 42000 Varaždin, Hrvatska
Milan Rezo ; Sveučilište u Zagrebu, Geodetski fakultet, Kačićeva 26, 10000 Zagreb, Hrvatska

Abstract

The purpose of soil improvement by vibro replacement is a general increase in the mechanical properties of soil in the requested volume. Columns-soil contact contours are usually irregular so that the classical concept of a pile is partially lost, and the emphasis switches to the properties of the composite system. Variations of embedded gravel volume and compaction cause significant changes of the soil density and the elastic properties before and after the intervention, and they are sufficiently distinctive for profiling by compression P-wave refraction tomography. Therefore, the analysis of the soil improvement degree is focused on the differences of P-wave velocities of the test pile field and control field. The relative relationship of the condition variations before and after embedding can be well defined by the position and extension, while the velocity ratio vector quantifies the effect of improvement by depth along the whole field. The shape of variations coincides well with the vibrator operation protocol.

Keywords

improvement control; P-wave velocity; refraction tomography; seismic waves; soil improvement

Hrčak ID:

69590

URI

https://hrcak.srce.hr/69590

Publication date:

27.6.2011.

Article data in other languages: croatian

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