By Robin Fell
ISBN-10: 041536440X
ISBN-13: 9780415364409
Geotechnical Engineering of Dams presents a entire textual content at the geotechnical and geological elements of the investigations for and the layout and building of recent dams. moreover, a lot realization is paid to the evaluation and evaluate of present dams. the most emphasis of this paintings is on embankment dams, yet a lot of the textual content, rather these elements relating to geology, can be utilized for concrete gravity and arch dams. All levels of research, layout and building of a dam are coated. unique descriptions are given from the preliminary web site evaluate and placement research software via to the initial and unique layout stages and, eventually, the development part. The evaluation of current dams, together with the review of the chance of inner erosion and piping research of hazards posed by means of these dams, can also be provided. This worthwhile resource on dam engineering contains the collective adventure of the authors, each one of whom has extra than thirty-five years experience within the topic quarter. layout tools are offered together with their theoretical foundation, to let the reader to increase a formal realizing of the probabilities and barriers of a mode. For its functional, well-founded technique, this paintings can function an invaluable advisor for pro dam engineers and engineering geologists and as a textbook for collage scholars.
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Example text
E. 2 39 Limitations on classification systems for weathered rock Quite often, particularly in sedimentary rocks, it is difficult or even impossible to determine which, if any of the rock substance at a site is fresh (unweathered). This is because such rocks can vary greatly in colour, porosity and strength due to past processes involved in their formation, rather than weathering processes. g. e. they classify as “extremely weathered”) when only slightly affected by chemical weathering. Intermediate weathered conditions cannot be defined in these cases.
2. g. g. calcite as cement in sandstone composed mainly of quartz grains, or – as veins or joint fillings or coatings in any rock mass. e. the degree of interlock and/or cementation of the mineral grains, and – its porosity and permeability. 1. 25 Susceptibility of igneous rock-forming minerals to weathering. 2. Lowest Muscovite Quartz Susceptibility of other common minerals to weathering. Group Mineral Effects of weathering Carbonates Calcite Dolomite Gypsum Anhydrite Halite (common salt) Pyrite and various other pyritic minerals Chlorite Vermiculite Illite Montmorillonite Kaolinite Haematite Ilmenite Limonite Readily soluble in acidic waters Soluble in acidic waters Highly soluble Highly soluble Highly soluble Weather readily to form sulphates, sulphuric acid and limonite Weathers readily to other clay minerals and limonite Weathers to kaolinite or montmorillonite* Weathers to kaolinite or montmorillonite* Weathers to kaolinite Stable** Weathers to limonite Stable Stable Evaporites Sulphides Clay minerals Oxides * These minerals expand and contract with wetting and drying and this can cause large disruptive forces and disintegration of some rocks.
Recommended descriptive terms for strength of rock substance. 2–1 1–2 2–4 4–10 Ͼ10 Ͻ5 5–25 25–50 50–100 100–250 Ͼ250 (1) Based on ISRM (1985): Suggested methods for the quantitative description of discontinuities in rock masses. (2) In rocks with planar anisotropy, the strength terms and numbers refer to the strengths when tested normal to the anisotropy. (3) The numbers assume that Qu is 25 times Is(50). In practice the ratio ranges typically from 10 to 25, with the weaker rocks towards the lower end.
Geotechnical Engineering of Dams by Robin Fell
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