Cone Penetration Tests (CPTs) in layered soils: a Material Point approach

Bird, R.E.; Coombs, W.M.; Augarde, C.E.; Brown, M.J.; Sharif, Y.; Carter, G.; Johnson, K.; Macdonald, C.

Abstract

Cone Penetration Tests (CPTs) can be used to determine in-situ soil properties and represent a practical choice for site investigation offshore, especially for linear infrastructure, such as offshore wind export cables. Information gained from CPTs is key for predicting soil-structure interaction behaviour, for example when predicting the tow forces involved in seabed ploughing, as the CPT provides an analogue to the process. The numerical modelling of CPTs is challenging due to the significant distortion in the soil displaced by the penetrating cone. This means that solving this sort of problem using finite elements, although not impossible, is numerically tiresome in terms of remeshing and mapping of state variables. Therefore, in this paper we adopt the Material Point Method (MPM) to develop a CPT prediction tool in layered soils. This MPM is combined with a novel non-matching mesh frictional boundary to represent the penetrometer. The developed tool will be used to understand the response of layered soils commonly found offshore as a step towards predicting the interaction of ploughs and anchors with the seabed.

Citation

Bird, R., Coombs, W., Augarde, C., Brown, M., Sharif, Y., Carter, G., Johnson, K., & Macdonald, C. (2023, June). Cone Penetration Tests (CPTs) in layered soils: a Material Point approach. Presented at 10th European Conference on Numerical Methods in Geotechnical Engineering, London

• Presentation Conference Type: Conference Paper (published)
• Conference Name: 10th European Conference on Numerical Methods in Geotechnical Engineering
• Start Date: Jun 26, 2023
• End Date: Jun 28, 2023
• Acceptance Date: Apr 26, 2023
• Publication Date: 2023
• Deposit Date: Jul 5, 2023
• Publicly Available Date: Jul 5, 2023
• DOI: https://doi.org/10.53243/numge2023-743
• Public URL: https://durham-repository.worktribe.com/output/1134593