Design of borehole deployments for slope stability analysis based on a probabilistic approach

This study proposes a cross-correlation map-based borehole deployment approach for two-dimensional probabilistic slope stability analysis. This approach designs the layout of the proper number of boreholes based on the cross-correlation between the factor of safety and spatially variable soil streng...

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Bibliographic Details
Published in:Computers and geotechnics 2021-05, Vol.133, p.103909, Article 103909
Main Authors: Cai, Jing-Sen, Jim Yeh, Tian-Chyi, Yan, E-Chuan, Tang, Rui-Xuan, Hao, Yong-Hong
Format: Article
Language:English
Subjects:
Analysis
Borehole deployment approach
Boreholes
Conditional analysis
Correlation
Cross correlation
Cross-correlation maps
Deployment
Dimensional stability
Heterogeneity
Slope stability
Slope stability analysis
Soil conditions
Soil properties
Soil strength
Spatial variability
Stability analysis
Surface stability
Two dimensional analysis
Uncertainty
Undrained shear strength
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Summary:This study proposes a cross-correlation map-based borehole deployment approach for two-dimensional probabilistic slope stability analysis. This approach designs the layout of the proper number of boreholes based on the cross-correlation between the factor of safety and spatially variable soil strength every part of a slope. Numerically synthesized, undrained slopes are investigated as examples to illustrate the effectiveness of the proposed approach. Results demonstrate that the proposed approach is viable, and the cross-correlation maps are the appropriate metric for design slope borehole deployment. Using the cross-correlation maps, a small number of boreholes can sufficiently capture the large-scale heterogeneities that are critical to the slope stability. This information can help to identify the slip surface and improve the slope stability analysis. The small-scale heterogeneity, due to its short correlation structure or the residual covariance of the soil property field after conditioning using the borehole data, leads to a small amount of uncertainty in slope stability analysis. This small uncertainty could be vital to the slope stability analysis when the slope stability is close to the limit equilibrium state.
ISSN:0266-352X
1873-7633
DOI:10.1016/j.compgeo.2020.103909