Journal
APPLIED OCEAN RESEARCH
Volume 128, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apor.2022.103365
Keywords
Ball penetration; Nonfull flow state; Soft clays; CEL approach; Contact area; In situ stress correction coefficients
Categories
Funding
- Natural Science Foundation of China
- National Key Research and Devel-opment Program
- Liaoning Revitalization Talents Program
- [51879036]
- [2018YFC0309203]
- [XLYC2002036]
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This paper simulates ball penetrations in soft clays in the nonfull flow state and investigates the mechanism of soft clays from the open cavity state to the trapped cavity state. An improved method for evaluating the undrained shear strength is proposed based on net penetration resistance and bearing capacity factors.
A ball penetrometer provides an efficient method for accurately assessing the undrained shear strength of soft marine clays. However, evaluating the undrained shear strength in the nonfull flow state remains in the exploratory period. In this paper, ball penetrations in soft clays in the nonfull flow state are simulated using a coupled Eulerian-Lagrangian approach, and the mechanism of soft clays from the open cavity state to the trapped cavity state is investigated in depth. Furthermore, the net penetration resistance in the nonfull flow state is achieved by in situ stress correction coefficients based on the contact area between the ball probe and sur-rounding clay, and the bearing capacity factors are then resolved. On this basis, an improved method for evaluating the undrained shear strength is proposed, combined with the net penetration resistance and the bearing capacity factors. Finally, the improved method is preliminarily validated by penetration tests in two types of soft clays of a special ball that can measure the earth pressure at different positions on the probe and ultimately validated by comparisons with the results of other studies, which indicates that the improved method provides good accuracy to assess the undrained shear strength of soft clays.
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