Adapting Diaphragm Wall Design for Post-Disaster Structures on Soft Ground: Challenges Under the 6th Generation Seismic Code

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Abstract: This paper is about the challenges of constructing diaphragm walls for post-disaster buildings on soft soils under Canada’ s 6th-generation seismic code. The study examines a case study in British Columbia, where poor soil conditions, urban restrictions, and pressurized artesian layers create significant design and constructability issues for a permanent diaphragm wall. The significant increase in seismic hazard values from the 5th to 6th generation of seismic codes has added more complexity to the design of geotechnical structures, demanding higher capacity against seismic forces. This study developed a new solution using Finite Element Analysis (FEA) and PLAXIS software to optimize diaphragm wall design, address site-specific challenges, and meet the 6th generation seismic code requirements. The findings indicate that through advanced numerical analysis, material optimization, and adapted construction methodologies, it is possible to achieve both resilience and compliance with the new seismic code. This research highlights how innovative engineering solutions can effectively address geotechnical and urban challenges to ensure the safety and performance of critical infrastructures in seismically active regions.

Keywords: diaphragm wall, 6th generation seismic code, finite element analysis (FEA), PLAXIS

Miss Atieh Shooshpasha; Mr. AMIR POSHNEJAD

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