Behaviour of ball penetrometer in uniform single- and double-layer clays

Geotechnique - Tập 63 Số 8 - Trang 682-694 - 2013
Mi Zhou, Muhammad Shazzad Hossain1, Yuxia Hu2, H. Liu
1Centre for Offshore Foundation Systems
2School of Civil, Environmental and Mining Engineering

Tóm tắt

The spherical ball penetrometer is increasingly being used for profiling the undrained shear strength of soils in centrifuge and offshore site investigations. This paper reports the results from large-deformation finite-element (LDFE) analysis undertaken to provide insight into ball penetrometer behaviour during undrained vertical penetration through uniform and stratified clay deposits. The LDFE analyses simulated continuous penetration of ball penetrometers from the seabed surface. The results were validated against centrifuge test data and plasticity solutions prior to undertaking a detailed parametric study, exploring a range of normalised soil properties and layer thicknesses and roughnesses of the soil/ball interface. The influence of the shaft (or area ratio) was also identified. The evolving soil failure patterns in single- and double-layer soils revealed two interesting aspects: soil backflow above the penetrometer, and trapping of the stronger material beneath the penetrometer. A framework has been proposed to account for these effects, which will allow accurate interpretation of soil undrained shear strength from the ball penetration resistance.

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Thông tin
Thông tin xuất bản

Geotechnique

Tập 63 Số 8

682-694

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