By Lianyang Zhang

Drilled shafts in rock are well-known as foundations of heavy constructions similar to street bridges and tall constructions. even if a lot has been learned about the research and layout of drilled shafts in rock, all of the significant findings are published within the type of stories and articles in technical journals and convention court cases. This publication is the 1st to give and summarize the most recent info in a single quantity, highlighting for the reader the primary adjustments among foundations in soil, and foundations in rock plenty containing discontinuities. This ebook offers equipment for characterizing discontinuities in jointed rock plenty, and contemplating their results at the behaviour of drilled shafts. A valuable instrument for practitioners in geological engineering, rock mechanics and starting place engineering.

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Clearly, the persistence of discontinuities has a major influence on the shear strength developed in the plane of the discontinuity. 2. Characterization of discontinuities in rock 41 Fig. 2 Simple sketches and block diagrams indicating the persistence of various sets of discontinuities (after ISRM, 1978). 2 Classification of discontinuity persistence. Description Modal trace length (m) Very low persistence <1 Low persistence 1–3 Medium persistence 3–10 High persistence 10–20 Very high persistence >20 Persistence ratio PR is often used to describe the persistence of discontinuities.

1 INTRODUCTION The primary difference between structures in soil and those in rock is that rock masses contain discontinuities. The analysis and design of any structure in rock require information on discontinuities in one form or another (Goodman, 1976; Hoek & Bray, 1981; Brady & Brown, 1985; Wyllie, 1999). Blocks formed by sets of unfavorably orientated discontinuities may fail by sliding or toppling, causing excessive movement or failure of foundations. The discontinuity properties that have the greatest influence at the design stage have been listed by Piteau (1970, 1973) as follows: 1.

Characterization of discontinuities in rock 41 Fig. 2 Simple sketches and block diagrams indicating the persistence of various sets of discontinuities (after ISRM, 1978). 2 Classification of discontinuity persistence. Description Modal trace length (m) Very low persistence <1 Low persistence 1–3 Medium persistence 3–10 High persistence 10–20 Very high persistence >20 Persistence ratio PR is often used to describe the persistence of discontinuities. 1) in which S is a region on the discontinuity plane with area As and is the area of the ith discontinuity in S (see Fig.

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