A new approach to evaluate the soil disturbance due to tube sampling
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Disturbance of specimens recovered by tube sampling from boreholes is an enduring relevant problem in geotechnical engineering. Practice has evolved slowly in this area, partly because the main research method applied, involving comparative field sampling and testing, remains strictly empirical. Theoretical approaches based on the strain path method (SPM) have been applied, that idealize the problem as one of steady ideal fluid motion, which is an unrealistic premise. A novel numerical technology, the Particle Finite Element method, is here applied to simulate smooth tube sampling using a conventional elasto-plastic Tresca model for the undrained soil. The results obtained are used to quantify the qualitative insight gained by field experimentation. It is shown that sample straining is proportional to the tube area ratio. The coefficient of proportionality is named here as the Hvorslev fraction. It is shown that the Hvorslev fraction is dependent on end-tube bevel and on the presence of a stationary piston. Furthermore, it is also shown that the contribution of these two features is independent of one another. The approach described represents an advance towards a soil mechanics-based rational approach to soil sampling.
CitationGens, A. [et al.]. A new approach to evaluate the soil disturbance due to tube sampling. A: International Conference on Soil Mechanics and Geotechnical Engineering. "Proceedings of Twentieth International Conference on Soil Mechanics and Geotechnical Engineering (ICSMGE 2022): a Geotechnical Discovery Down Under, Sydney, New South Wales, Australia, 1-5 May 2022". 2022, p. 383-388. ISBN 978-0-9946261-4-1.
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