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    Managing Deep Excavation under Strict Deformation Control Comparison between Island method and Strut for Deep excavation

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    AI Summary

     This session examines the engineering challenge of managing deep excavation in a constrained urban site, where strict deformation control, soft ground conditions, nearby existing structures, and high groundwater level must all be considered within a realistic construction sequence. We present a 3D deep excavation case study for a major development in Jakarta, Indonesia, highlighting the island method, its comparison with the strut method, and the foundation modeling approach used to evaluate secant pile behavior and staged construction under SNI 8640:2017. Participants will gain practical insight into how MIDAS GTS NX supports safe and realistic deep excavation analysis for complex basement and foundation projects. 

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    Description

     In this session, we will present a 3D deep excavation case study for a major development in Jakarta, Indonesia, consisting of two buildings with 16 and 8 stories, one mosque, and one conference building over a two-level basement. The project involved strict deformation control under SNI 8640:2017, soft ground conditions, nearby existing structures, and high groundwater level. 

     

    The session will highlight the key excavation strategy using the island method, its comparison with the strut method, and the foundation modeling approach used to evaluate secant pile behavior and staged construction. Attendees will gain practical insight into how MIDAS GTS NX supports safe and realistic deep excavation analysis.

    Key Points

    Deep Excavation with the Island MethodExplore how the island method was applied as a key excavation approach for staged basement construction in a constrained urban site.

    Comparison of Island and Strut MethodsUnderstand the practical advantages and disadvantages of the island method and strut method in terms of cost, constructability, workspace, and contractor preference.

    Deformation Control under SNI 8640:2017Learn how the project addressed strict lateral deformation requirements using Indonesia’s geotechnical design criteria as a key design reference.

    Foundation and Secant Pile Modeling in MIDAS GTS NXSee how secant piles, soil conditions, and staged construction were modeled to evaluate excavation behavior and support foundation design decisions.

    Speaker

    Martin Wijaya, Ph.D. President Director Hamdany Wijaya Consultant
    Martin Wijaya is a geotechnical engineer and academic specializing in numerical modeling, seismic hazard analysis, and slope stability. He has experience across consultancy, research, and public-sector technical projects, including MRT excavation and tunnel works, bridge foundation design, ground improvement, and slope rehabilitation. His technical background includes MIDAS GTS NX, PLAXIS, and GeoStudio, and he has also contributed to national engineering initiatives in Indonesia. In addition to practice, he is an active author and reviewer in the geotechnical field, with a CRC Press publication and approximately 20 journal papers.
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