Experimental and theoretical investigation of deep vibro compaction

Abstract

Deep vibro compaction (vibroflotation) is a soil improvement technique, which was patented by the company Keller in the 1930s and since then it has been continually developed and has been successfully used worldwide for deep compaction of granular soils. The methods for quality control of the compaction works are largely empirical in nature and therefore often unreliable. In a current research project, fundamental experimental investigations on real‐time quality control for the deep vibro compaction were executed. Large‐scale test measurements and numerical simulations were performed to investigate the three‐dimensional vibrator movement during the compaction process. Reliable measurements with measuring instruments on the vibrator tube during the compaction process have been conducted within the current large‐scale field tests. This paper presents the layout of the large‐scale in‐situ tests, moreover, selected test results are shown, and possible indicators of the changing soil conditions are discussed.

Quality monitoring in vibro ground improvement – A hybrid machine learning approach

“…However, as the produced elements are sub-surface there is no possibility to establish ground truth. The manual inspection of the columns by a geotechnical expert, e.g., using dynamic probing [7], is time-consuming and costly; furthermore, this can only be applied after the process is finished [3]. As a result, no reliable labelling of the data can be performed during the production process.…”

“…The rig is instrumented with multiple sensors that enable the collection of real-time machine data during performing the ground improvement process [7]. For each foundation column, the data are collected and organized as a multivariate time-series (MVTS).…”