Walter I. Paniagua
Ir. Chaido Doulala-Rigby Prof. Jie Han Prof. Sandra Houston Walter I. Paniagua Prof. Krishna R. Reddy Prof. Marawan M. Shahien Prof. Erol Tutumluer Prof. Gioacchino Viggiani Prof. Linbing Wang Prof. Andrew J. Whittle Prof. Chungsik Yoo
Walter I. Paniagua
International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE)
Keynote lecture title:Precast slurry walls and plunged concrete columns: an alternative for the top-down system  

Civil Engineer, with Master´s Degree and PhD on soil mechanics. Since 1981, his professional activities has been focused on the deep foundations industry, in activities related with construction, design, and quality control.

Since 2003, he is founder and CEO of PILOTEC, a deep foundations construction company, based in Mexico City. He has developed +570 geotechnical construction projects, and +140 geotechnical consults.

Current member of the following committees: Structural Safety, of the Association of Civil Engineers of Mexico (CICM); Foundations design and construction, for the Mexico City Building Code; Slurry Walls and Energy Foundations, in the Deep Foundations Institute.

In the International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE) is Vicepresident for North America (2022-2026); former chair of Technical Committee TC214 on Soft Soils (2014-2018), and former member of the Public Relations Committee (2009-2013).

Has published +90 technical papers and is co-author of seven books. Post graduate professor at the National University of Mexico. Member of the Academy of Engineering of Mexico. Past President of the Mexican Society for Geotechnical Engineering (SMIG) from 2009 to 2010.

Received the Professional Practice award in 1996 (SMIG), Best Civil Engineering Book award in 2002 (CICM) and Best Technical Paper award (CICM, 2022). Has delivered lectures and short courses in Mexico, USA, Canada, Italy, Egypt, El Salvador, Panama, Argentina, Costa Rica, Ecuador, Peru, Colombia and Bolivia.

The construction procedure for a two basement excavation in the very soft soils of Mexico City is described, using precast diaphragm walls; furthermore, some of this elements were built as barrettes, as part of the foundation, combined with drilled shafts, where  plunged precast concrete columns were installed, as part of the top-down excavation system. 

The building is located in the corner of two major streets; in one of the streets, an underground subway is very close to the excavation (less than 2m). Other boundaries were a hospital, and two-story houses considered with architectural merit, with poor structural reinforcement.

The alternative proved to be effective in cost and quality, compared with the more classic cast in place walls and steel columns. During the excavation process, inclinometer readings were made, assuring the quality control.