Experience of several years in the geotechnical engineering field as an academic researcher and involved in many construction projects. Well-versed in numerical analysis and machine learning modeling, particularly for underground construction problems (deep excavation and tunneling). Published in reputable journals, international conferences, and winning several awards for best papers. Passionate in teamwork and leadership, have good public speaking ability, also fluent in Indonesian, English, and Chinese Mandarin.
EDUCATION
Postdoctoral Fellow at National Taiwan Unviersity
Postdoctoral Fellow at National Taiwan University of Science and Technology
PhD at National Taiwan University of Science and Technology
MSc at National Taiwan University of Science and Technology
BSc at University of Lambung Mangkurat
RESEARCH, TEACHING, or OTHER INTERESTS
Geotechnical Engineering and Engineering Geology, Computers in Earth Sciences
20
Scopus Publications
124
Scholar Citations
8
Scholar h-index
4
Scholar i10-index
Scopus Publications
Physics-Assisted Data-Driven Methods for Predicting the Performance of Deep Excavation in Soft Clays Ari Surya Abdi, Chang-Yu Ou, Jianye Ching International Journal of Geomechanics, 2026 This paper investigates the use of physics-assisted data-driven methods for predicting the performance (such as wall deformation and factor of safety against basal heave) of deep excavation in soft clay. Physics-assisted prediction methods with different levels of physical analysis assistance are investigated: the Level 1 method adopts multiple physical analysis parameters such as excavation dimension and support system stiffnesses as inputs; the Level 2 method relies on the wall deformation calculated by one-dimensional (1D) FEM as the main input; the Level 3 method relies on the wall deformation calculated by three-dimensional (3D) FEM as the main input. The degree of physical analysis assistance is minimal for the Level 1 method and maximal for the Level 3 method because the Level 1 method does not require FEM, but the Level 3 method requires 3D FEM. A new database comprising 100 clay sites is compiled to train the three data-driven methods, and their prediction capacities are compared using the extensive leave-one-out cross-validation method. The results show that the Level 3 method provides the most accurate wall deformation predictions, achieving the highest coefficient of determination (R2 = 0.73) and coefficient of efficiency (COE = 0.72) and the lowest mean absolute error (MAE = 0.42), with the narrowest 95% confidence intervals, whereas the Level 2 method exhibits weaker performance (R2 = 0.58; COE = 0.58; MAE = 0.51). Accordingly, wall deformation prediction should rely on the Level 3 method when 3D FEM is feasible. When 3D FEM is not viable, the Level 1 method (R2 = 0.61; COE = 0.61; MAE = 0.50) is preferred over the Level 2 method because FEM-free physical parameters are less complicated and more informative than 1D FEM outputs. For factor of safety prediction, the Level 1 method performs better than other methods due to multiple physical input parameters. Therefore, the Level 3 method is recommended for wall deformation prediction when 3D FEM is available, while the Level 1 method is recommended for factor of safety prediction and for practical applications when 3D FEM is unavailable.
Effectiveness of small-diameter timber piles to enhance the bearing capacity of micropiled foundation in soft clays Yusti Yudiawati, Ari Surya Abdi, Muhammad Dwiyanto Agung Prakasa Results in Engineering, 2025 • Gelam wood ( Melaleuca cajuputi ) and Bornean ironwood ( Eusideroxylon zwageri ) effectively enhance the bearing capacity as micro-pile foundations in soft clays. • Ironwood columns combined with Gelam wood micro-piles (IMP) offer sustainable solutions as alternatives to concrete-based foundation systems. • BCR value of IMP and FMP tends to increase constantly for larger pile number ( n pile > 9). • BCR value of IMP and FMP rise by approximately 2.5 times with greater micropile spacing, and declines at s/D = 9 due to the negative group effect. • The Mohr-Coulomb soil model provides reliable results on load transfer mechanisms and soil-structure interactions in foundation systems. Small-diameter natural timbers like gelam and ironwood have been widely use in constructing micropile foundations, particularly in undrained soft clay. However, the design approaches and analytical methods for micropile foundations using gelam and ironwood remain highly empirical, with limited studies investigating their load transfer mechanism. Their application often depends on empirical knowledge and field experience. In this study, a series of three-dimensional finite element analyses were conducted to simulate the actual arrangement and behavior of micropile systems, focusing on two foundation types utilizing gelam wood micropiles: ironwood with gelam wood micropiles (IMP) and concrete footing with gelam wood micropiles (FMP).The numerical results are initially validated through the field test data. According to the numerical results, for IMP models, load transfer begins with ironwood side friction, followed by tip resistance and additional base support from horizontal Gelam wood, while in FMP models, Gelam wood friction and tip resistance mobilize first, with the footing starting to contribute thereafter, enhancing bearing capacity and reducing settlement. Increasing the number of micropiles more than doubles the bearing capacity for both IMP and FMP models. Additionally, for configurations with four micropiles, a spacing-to-diameter ratio of six is optimal for maximizing bearing capacity and minimizing settlement.
Three-Dimensional Analysis of Buttress and Cross Walls on Controlling Wall Deformation Induced by Deep Excavation Ari Surya Abdi International Journal of Geomechanics, 2025 The buttress and cross walls are commonly used to control wall deformation induced by deep excavations. In this paper, the optimum performance of the buttress wall along two cross-wall intervals in deep excavations is evaluated through the three-dimensional finite-element analysis. A well-documented case history of a deep excavation was initially utilized to validate numerical analysis. Furthermore, extensive numerical parametric studies were performed to investigate the most effective design of deep excavation with buttress and cross walls. The results concluded that the implementation of buttress walls could enhance the overall flexural rigidity of the retaining system and provide additional frictional resistance, in which its mobilized friction area was highly dependent on the location of the buttress wall along the interval of two cross walls. Furthermore, a new design chart is proposed to evaluate the most optimum buttress wall location along two cross-wall intervals in reducing wall deformation, which was verified by a real excavation case and can be reasonably used as design recommendations for deep excavation with buttresses and cross walls.
Physics-Assisted Data-Driven Methods for Predicting the Performance of Deep Excavation in Soft Clays AS Abdi, CY Ou, J Ching International Journal of Geomechanics 26 (7), 04026127 , 2026 2026
Lateral displacement behaviour of spun piles embedded in fill layer over soft soil using 3D finite element analysis AS Abdi, MDA Prakasa, Y Yudiawati, YF Arifin, A Kawanda, MA Maruf International Journal of Geotechnical Engineering, 1-16 , 2026 2026
Investigation of shaft resistance mobilization in large-diameter bored piles using O-cell test and numerical analysis AS Abdi, YF Arifin, A Kawanda International Journal of Geotechnical Engineering, 1-15 , 2026 2026
Prediction of wall deflection and ground settlement during deep excavation using hierarchical Bayesian model-based stacking ensemble learning framework AS Abdi, J Ching, MC Hsu Georisk: Assessment and Management of Risk for Engineered Systems and … , 2026 2026 Citations: 1
Field Testing and Numerical Simulation of Square Footings Reinforced with Micropiles in Undrained Soft Clays AS Abdi, Y Yudiawati Indian Geotechnical Journal, 1-17 , 2025 2025
Numerical assessment of basal heave stability for deep excavation with buttress wall in soft clays AS Abdi, CY Ou Acta Geotechnica, 1-15 , 2025 2025 Citations: 1
Numerical Investigation of Micropiled Timber Foundations in Soft Clays Using 3D Finite Element Analysis Y Yudiawati, AS Abdi Geotechnical and Geological Engineering 43 (7), 373 , 2025 2025
Effectiveness of buttress wall in reducing wall deflection for deep excavation supported by tied-back retaining wall systems AS Abdi, MDA Parakasa Indonesian Geotechnical Journal 4 (2), 99-112 , 2025 2025
Effectiveness of small-diameter timber piles to enhance the bearing capacity of micropiled foundation in soft clays Y Yudiawati, AS Abdi, MDA Prakasa Results in Engineering, 106847 , 2025 2025 Citations: 1
Three-dimensional analysis of buttress and cross walls on controlling wall deformation induced by deep excavation AS Abdi International Journal of Geomechanics 25 (8), 04025154 , 2025 2025 Citations: 5
Optimizing ground control points for UAV photogrammetry: A case study in slope stability mapping MH Ridha, YF Arifin, AS Abdi Communications in Science and Technology 10 (1), 170-178 , 2025 2025 Citations: 1
Undrained stability of deep excavations with the strut-free retaining wall system AS Abdi, CY Ou, CT Lee Acta Geotechnica 20 (7), 3373-3393 , 2025 2025 Citations: 8
Effect of cross wall on the strut forces for braced excavations in clays AS Abdi, CY Ou, F Teng Computers and Geotechnics 171, 106344 , 2024 2024 Citations: 9
Closure to “Numerical Study of the Effect of Ground Improvement on Basal Heave Stability for Deep Excavations in Normally Consolidated Clays” AS Abdi, CY Ou Journal of Geotechnical and Geoenvironmental Engineering 150 (7), 07024006 , 2024 2024 Citations: 1
Evaluation of cross wall performance on restraining the wall displacement and resisting the basal heave in deep excavations AS Abdi, CY Ou Acta Geotechnica 19 (6), 4037-4053 , 2024 2024 Citations: 16
NUMERICAL EVALUATION ON THE APPLICATION OF SMALL STRAIN STIFFNESS MODEL FOR DEEP EXCAVATIONS IN SOFT CLAYS. YX Li, AS Abdi, F Teng, CY Ou Journal of GeoEngineering 18 (3) , 2023 2023 Citations: 9
Investigation of excavation stability with buttress and cross wall AS Abdi, CY Ou Smart Geotechnics for Smart Societies, 1038-1041 , 2023 2023
Numerical study of the effect of ground improvement on basal heave stability for deep excavations in normally consolidated clays AS Abdi, CY Ou Journal of Geotechnical and Geoenvironmental Engineering 149 (7), 04023042 , 2023 2023 Citations: 22
Failure investigation of braced excavation in soft clays: case study on the collapse of Nicoll Highway AS Abdi, CY Ou IOP conference series: earth and environmental science 1184 (1), 012010 , 2023 2023 Citations: 9
Numerical evaluation on the performance of deep excavation with the strut-free retaining system in clays AS Abdi, CY Ou 10th European Conference on Numerical Methods in Geotechnical Engineering 24 , 2023 2023 Citations: 10
MOST CITED SCHOLAR PUBLICATIONS
A study of the failure mechanism of braced excavations using 3D finite-element analysis AS Abdi, CY Ou International Journal of Geomechanics 22 (7), 04022084 , 2022 2022 Citations: 31
Numerical study of the effect of ground improvement on basal heave stability for deep excavations in normally consolidated clays AS Abdi, CY Ou Journal of Geotechnical and Geoenvironmental Engineering 149 (7), 04023042 , 2023 2023 Citations: 22
Evaluation of cross wall performance on restraining the wall displacement and resisting the basal heave in deep excavations AS Abdi, CY Ou Acta Geotechnica 19 (6), 4037-4053 , 2024 2024 Citations: 16
Numerical evaluation on the performance of deep excavation with the strut-free retaining system in clays AS Abdi, CY Ou 10th European Conference on Numerical Methods in Geotechnical Engineering 24 , 2023 2023 Citations: 10
Effect of cross wall on the strut forces for braced excavations in clays AS Abdi, CY Ou, F Teng Computers and Geotechnics 171, 106344 , 2024 2024 Citations: 9
NUMERICAL EVALUATION ON THE APPLICATION OF SMALL STRAIN STIFFNESS MODEL FOR DEEP EXCAVATIONS IN SOFT CLAYS. YX Li, AS Abdi, F Teng, CY Ou Journal of GeoEngineering 18 (3) , 2023 2023 Citations: 9
Failure investigation of braced excavation in soft clays: case study on the collapse of Nicoll Highway AS Abdi, CY Ou IOP conference series: earth and environmental science 1184 (1), 012010 , 2023 2023 Citations: 9
Undrained stability of deep excavations with the strut-free retaining wall system AS Abdi, CY Ou, CT Lee Acta Geotechnica 20 (7), 3373-3393 , 2025 2025 Citations: 8
Three-dimensional analysis of buttress and cross walls on controlling wall deformation induced by deep excavation AS Abdi International Journal of Geomechanics 25 (8), 04025154 , 2025 2025 Citations: 5
Prediction of wall deflection and ground settlement during deep excavation using hierarchical Bayesian model-based stacking ensemble learning framework AS Abdi, J Ching, MC Hsu Georisk: Assessment and Management of Risk for Engineered Systems and … , 2026 2026 Citations: 1
Numerical assessment of basal heave stability for deep excavation with buttress wall in soft clays AS Abdi, CY Ou Acta Geotechnica, 1-15 , 2025 2025 Citations: 1
Effectiveness of small-diameter timber piles to enhance the bearing capacity of micropiled foundation in soft clays Y Yudiawati, AS Abdi, MDA Prakasa Results in Engineering, 106847 , 2025 2025 Citations: 1
Optimizing ground control points for UAV photogrammetry: A case study in slope stability mapping MH Ridha, YF Arifin, AS Abdi Communications in Science and Technology 10 (1), 170-178 , 2025 2025 Citations: 1
Closure to “Numerical Study of the Effect of Ground Improvement on Basal Heave Stability for Deep Excavations in Normally Consolidated Clays” AS Abdi, CY Ou Journal of Geotechnical and Geoenvironmental Engineering 150 (7), 07024006 , 2024 2024 Citations: 1
Physics-Assisted Data-Driven Methods for Predicting the Performance of Deep Excavation in Soft Clays AS Abdi, CY Ou, J Ching International Journal of Geomechanics 26 (7), 04026127 , 2026 2026
Lateral displacement behaviour of spun piles embedded in fill layer over soft soil using 3D finite element analysis AS Abdi, MDA Prakasa, Y Yudiawati, YF Arifin, A Kawanda, MA Maruf International Journal of Geotechnical Engineering, 1-16 , 2026 2026
Investigation of shaft resistance mobilization in large-diameter bored piles using O-cell test and numerical analysis AS Abdi, YF Arifin, A Kawanda International Journal of Geotechnical Engineering, 1-15 , 2026 2026
Field Testing and Numerical Simulation of Square Footings Reinforced with Micropiles in Undrained Soft Clays AS Abdi, Y Yudiawati Indian Geotechnical Journal, 1-17 , 2025 2025
Numerical Investigation of Micropiled Timber Foundations in Soft Clays Using 3D Finite Element Analysis Y Yudiawati, AS Abdi Geotechnical and Geological Engineering 43 (7), 373 , 2025 2025
Effectiveness of buttress wall in reducing wall deflection for deep excavation supported by tied-back retaining wall systems AS Abdi, MDA Parakasa Indonesian Geotechnical Journal 4 (2), 99-112 , 2025 2025
