3D analysis of S-wave propagation in soft deposits

Article Abstract:

The authors discuss previous works on the use of gravity effects on seismic analysis of soil structure, which may help in the engineering of large scale structures such as dams. Problems in the previous work include the gravity effect on Mexico City clays which do not compress under their own weight, as the previous author suggests; ground substance in this area are not cause by gravity effects, but rather by water withdrawal from aquifers; and resonant column tests can be more effective than the field geophysical tests used.

Mexico, Statistical Data Included, Natural history, Earthquake engineering, Sedimentation and deposition, Deposition (Geology), Seismic waves

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Analytical model for particle migration within base soil-filter system

Article Abstract:

The analytical model and experimental results on particle migration within a base soil-filter system were erroneous. Calculations from the analytical model indicate there would be a substantial loss of small particles at the top of the base soil and that a smaller but more significant transfer of base soil into the filter would occur at the contact boundary between base and filter. A seepage test purportedly supported the calculations. However, attempts to duplicate the tests failed to produce the same results.

Filters (Separation)

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Deep rotational stability of tiedback excavations in clay

Article Abstract:

The failure of the Central Artery (I-93)/Tunnel (I-90) Project in Boston, MA, can be attributed to tieback problems and not to deep rotational instability as claimed by T.D. O'Rourke and C.J. O'Donnell in a paper published in the 'Journal of Geotechnical and Geoenvironmental Engineering' in Jun 1997. O'Rourke and O'Donnell, however, reject the notion that tieback anchor creep was a source of the structural failure. They pointed out that tieback anchor and wall displacements were similar during construction.

Tunnel construction, Excavation, Tunneling, Structural stability, Structural failures

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