Seismic Design Criteria for Foundations on Control Piles

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by Enrique Tamez, TGC-Geotecnia SA, Mexico City, Mexico,

Document Type: Proceeding Paper

Part of: The Mexico Earthquakes—1985: Factors Involved and Lessons Learned

Abstract: Control piles have been widely used in Mexico City for underpinning buildings with excessive settlements caused by the consolidation of the soft clay deposits, and as a foundation solution for structures supported by point bearing piles driven to a firm stratum through the clay deposits, with the aim of preventing the buildings from emerging due to the regional subsidence. An analysis is presented of the mechanism governing the interaction effects of the different component parts of the control system (box-type concrete foundation, deformable pile control device, point-bearing pile, surrounding compressible soil, firm supporting layer and regional subsidence), including seismic forces not contemplated in the original design of the system, and recommended design criteria are suggested to guarantee a satisfactory behavior of the control piles.

Subject Headings: Seismic design | Foundation design | Pile foundations | Concrete piles | Structural control | Seismic tests | Load and resistance factor design | Land subsidence | Soil settlement | Mexico City

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