By Dr. J. A. R. Ortigao, Dr. Alberto S. F. J. Sayao (auth.)
ISBN-10: 3642074944
ISBN-13: 9783642074943
ISBN-10: 3662076802
ISBN-13: 9783662076804
This ebook is geared toward the training engineer and engineering geologist operating in tropical environments, the place lands lides are in most cases caused through rain fall. This publication relies on an identical paintings released in 1999 in Portuguese, which grew to become the Rio de Janeiro Slope guide. This booklet is an engineering consultant for the layout of slopes and stabilisation works in rocks and residual soils. It evolves from the cumulative event amassed by means of a number of engineers and geologists who confronted serious slope difficulties. The authors' event all through primary and South the United States (Costa Rica, Argentina, Bolivia, Peru, Ecuador and Venezuela) and the some distance East, specially Hong Kong and Malaysia, used to be used as a starting place for penning this ebook. The paintings additionally advantages vastly from the time spent in Hong Kong in 1996 and 1997 through the 1st editor on sabbatical on the urban collage of Hong Kong, and the discussions he had with many colleagues from the Geotechnical Engineering place of work (GEO) of the Hong Kong executive, specially Dr. A. Malone, Mr. w.K. Pun, Dr. A. Li, Mr. okay. Ho, and Mr. y.c. Chan between others.
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Extra info for Handbook of Slope Stabilisation
Example text
Tension cracks: In clefts, where the slope is very steep, some times even vertical, and when the strength of the rock is low, vertical tension cracks may be formed. In rainy periods the water infiltrates very easily within these fissures and, since their drainage is usually much slower than the infiltration rate, high hydrostatic pressures are built up «(cleft water pressures"), exerting hydrostatic lateral thrust on the thin vertical slice of rock, causing failures by toppling. • Sheared planes: In planes that underwent displacement in the geologie past, like bedding planes in folded strata and planar discontinuities, the friction angle decreased due to the destruction of the roughness during shear, and the friction coefficient also decreased, eventually attaining its residual strength.
Tilting of church pillars. Mayor of Puriscal (centre) and Dr Sayao (left) during site inspection Figure 24 shows a surface crack on the ground, a clear indication of the landslide and the movements. This kind of crack appears at many places in the town. The movements have already damaged several buildings. One of the main losses is the church, which is no longer used, due to the level of damage it has sustained. Figure 25 shows the tilting pillars of the church fayade and Fig. 26 is an internal view of the wall cracks.
Thus, a cut through the entire sequence will involve all of them, requiring consideration of each zone for the study and design of the slope. 13 14 CHAPTER 2 Geologie Factors in Slope Stability Fig. 9. Weathered schist within sound quartzite, as an example of intercalation of weak rock within hard rock (slope toe of the left abutment, Jaguara dam site, Minas Gerais-Säo Paulo, Brazil) The current idea that subsoil always improves its geotechnical quality with depth is derived from the materials existing in a typical weathering profile as described above.
Handbook of Slope Stabilisation by Dr. J. A. R. Ortigao, Dr. Alberto S. F. J. Sayao (auth.)
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