Simulation of Geological Uncertainty Using Coupled Markov Chain: A Case Study at a Manually Filled Loess Site
Publication: ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part A: Civil Engineering
Volume 10, Issue 2
Abstract
Stratigraphic variability contributes significantly to the deformation and stability of geotechnical structures. In this case study, the stratigraphic variability of a typical deep manually filled site in Lanzhou New District, Gansu Province, China is simulated. By applying Walther’s law, the relationship between vertical and horizontal transition counting matrices is established to calculate the vertical and horizontal state-transition probability matrices using a coupled Markov chain model. The Monte Carlo simulation method is used to predict the distribution of soil layers. Based on borehole data, the effects of different borehole layout schemes on the estimation of the transfer probability matrix and prediction of the soil layer distribution are investigated. The results indicate that to obtain accurate estimations for the state transition probability matrix and predictions for the soil layer distribution, more evenly distributed borehole data should be selected. When the values of the diagonal elements in the matrix are high, the sensitivity of the transition probability matrix estimation to the borehole layout scheme is low. Multiple predictions of soil layer distributions using the same borehole layout scheme yield different results primarily because of the significant spacing between the boreholes.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant Nos. 52268058; 51868038); Tianyou Youth Talent Lift Program of Lanzhou Jiaotong University; Special Funds for Guiding Local Scientific and Technological Development by The Central Government (22ZY1QA005). Gansu Provincial Department of Education Industrial Support Program Project, China (2023CYZC-34).
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Received: Oct 20, 2023
Accepted: Jan 2, 2024
Published online: Apr 4, 2024
Published in print: Jun 1, 2024
Discussion open until: Sep 4, 2024
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