By Lianyang Zhang
Drilled shafts in rock are popular as foundations of heavy buildings akin 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 kind of reviews and articles in technical journals and convention complaints. This ebook is the 1st to provide and summarize the most recent details in a single quantity, highlighting for the reader the main alterations among foundations in soil, and foundations in rock lots containing discontinuities. This e-book provides equipment for characterizing discontinuities in jointed rock lots, 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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Additional resources for Drilled Shafts in Rock Analysis and Design
7(a)]. For both the in-plane (Fig. 7) and the low-angle out-of-plane (Fig. 5) where σt is the tensile strength of the intact rock; and σa is the effective normal stress on the discontinuity plane. Fig. 7 In-plane failure of intact rock: (a) Tensile fracture and corresponding Mohr’s circle; and (b) Secondary shear fracture (after Zhang, 1999). 6) in which LS is the total sampling length along the direction of the discontinuity traces, DLi is the length of the ith in-plane discontinuities and DLl is the length of the lth low- Drilled shafts in rock 46 angle-transition discontinuities (see Fig.
8). 7) Fig. 8 Definition of PR considering both in-plane and low-angle-transition discontinuities (after Zhang, 1999). where m and n are the numbers respectively of the in-plane and low-angle-transition (β <θt) discontinuities within the sampling length LS (see Fig. 8). , 1994). However, since a rock mass is usually inaccessible in three dimensions, the real discontinuity shape is rarely known. Information on discontinuity shape is limited and often open to more than one interpretation (Warburton, 1980a; Wathugala, 1991).
Fracture cleavage (also known as false cleavage and strain slip cleavage) is a term describing incipient, cemented or welded parallel discontinuities that are independent of any parallel alignment of minerals. Spencer (1969) lists six possible mechanisms for the formation of fracture cleavage. In each mechanism, lithology and stress conditions are assumed to have produced shearing, extension or compression, giving rise to numerous closely-spaced discontinuities separated by thin slivers of intact rock.
Drilled Shafts in Rock Analysis and Design by Lianyang Zhang