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Título del libro: Geotechnical Engineering In The Xxi Century: Lessons Learned And Future Challenges Título del capítulo: Assessment of the Settlement and Horizontal Displacement of Test Embankments with Preloading, Drains, and Vacuum in the Former Texcoco Lake, Mexico
Test embankment; lateral displacement; settlement; vacuum consolidation
Resumen:
In this paper, the settlement and horizontal displacement of four test
embankments (TEs) built in the former Texcoco Lake are evaluated. The
embankments are part of the New Mexico City International Airport
(NAICM) project and were constructed to study the effects of different
soil improvement techniques based on surcharge preloading with (a) sand
drains and prefabricated vertical drains (PVDs), (b) PVDs and
drain-to-drain vacuum pressure, and (c) PVDs, vacuum pressure, and an
airtight membrane. Their behavior is compared with that of an unimproved
reference embankment. The site conditions are described, and the
geometric and construction characteristics of each embankment are
presented. A monitoring period of 360 days after the start of
construction is discussed. In addition, the degree of consolidation in
each trial embankment is calculated based on in situ records from
settlement plates. Finally, the effectiveness of each soil improvement
technique is analyzed, and some concluding comments are provided.