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

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. 

Benefit

Presentation File

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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

Harsha Tadavarthi Geotechnical Team Leader & Technical Manager MIDAS IT Australia
Harsha Tadavarthi is the Technical Manager for the Oceania region at MIDAS IT, with over 8 years of experience in geotechnical engineering. He specializes in advanced numerical modeling and provides expert support for geotechnical and structural analysis across dams, hydropower, underground, mining, and other critical infrastructure projects. Harsha's expertise also includes thermal and seismic simulation of dams, as well as the design and analysis of complex geotechnical systems. He leads the seamless delivery of solutions in dam engineering, ensuring industry-leading support and innovation in geotechnical modeling. Through consultancy, training, and international workshops, he empowers professionals with both practical insights and theoretical foundations in geotechnical and structural modeling, fostering excellence across the engineering community.
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