Effect of slope on lateral bearing capacity of nearshore large-diameter monopiles in cohesive soil

Abstract

This study investigates the effect of slope on the lateral bearing capacity of nearshore large-diameter monopiles in cohesive soil by the finite element limit analysis (FELA) method. The reduction coefficient is introduced to quantify the capacity reduction due to the slope effect, and the critical distance making the slope-induced capacity reduction negligible is normalized for generalization. After the validations by cases of different soils, an alternative way to quickly and straightforwardly assess the pile bearing capacity in sloping stratum for the most frequently-encountered cases in engineering practice is provided by multiplying the reduction coefficients in several design tables with the capacity in level stratum. The subsequent parametric studies indicate that the reduction coefficient and critical dimensionless distance are mainly governed by the internal friction angle, slope angle, and pile embedded length-diameter ratio but are almost insensitive to dimensionless cohesion and slope height-pile embedded length ratio. In addition, the failure mode of the pile-slope system would develop from local failure to transitional failure and global failure with a significant drop in pile bearing capacity while the pile-slope parameters cannot guarantee slope stability.

Keywords:

• Nearshore large-diameter monopile
• lateral bearing capacity
• cohesive soil slope
• reduction coefficient
• critical pile-slope distance
• finite element limit analysis

Acknowledgments

The authors are thankful to OptumCE for the free access of OptumG2 program (academic edition) to perform this study.

Disclosure statement

No potential conflict of interest was reported by the authors.

Data availability statement

Some or all data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request (the data in the graph and the code of calculation, etc.).

Additional information

Funding

This research is part of work supported by grants from the National Natural Science Foundation of China (No. 52108317) and the Hunan Provincial Natural Science Foundation of China (No. 2022JJ40074).