Drilled Shafts in Rock Analysis and Design by Lianyang Zhang

By Lianyang Zhang

Drilled shafts in rock are conventional as foundations of heavy buildings corresponding to road bridges and tall constructions. even supposing a lot has been learned about the research and layout of drilled shafts in rock, the entire significant findings are published within the kind of studies and articles in technical journals and convention lawsuits. This publication is the 1st to offer and summarize the most recent details in a single quantity, highlighting for the reader the primary ameliorations among foundations in soil, and foundations in rock lots containing discontinuities. This e-book offers equipment for characterizing discontinuities in jointed rock plenty, and contemplating their results at the behaviour of drilled shafts. A valuable device for practitioners in geological engineering, rock mechanics and origin engineering.

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Description Spacing (mm) Extremely close spacing <20 Very close spacing 20–60 Close spacing 60–200 Moderate spacing 200–600 Wide spacing 600–2000 Very wide spacing 2000–6000 Extremely wide spacing >6000 (c) Persistence and size Persistence is a term used to describe the areal extent or size of a discontinuity within a plane. It can be crudely quantified by observing discontinuity trace lengths on exposed rock faces. It is one of the most important rock mass parameters, but one of the most difficult to determine.

001 to 1000. 16. Since the Q and RMR systems are based on much the same properties, they are highly correlated and can be predicted one from the other. , 1974). 5 (c) No rock wall contact when sheared Zone containing clay 1 (nominal) 1 (nominal) minerals thick enough to prevent rock wall contact Sandy, gravelly or crushed zone thick enough to prevent rock wall contact Joint Alternation Number Approximate residual angle of friction (deg) Ja (a) Rock wall contact A. e. quartz or epidote B. Unaltered joint walls, surface staining only 1 25– 35 C.

1 gives the terminology used by ISRM (1978). 1 Classification of discontinuity spacing. Description Spacing (mm) Extremely close spacing <20 Very close spacing 20–60 Close spacing 60–200 Moderate spacing 200–600 Wide spacing 600–2000 Very wide spacing 2000–6000 Extremely wide spacing >6000 (c) Persistence and size Persistence is a term used to describe the areal extent or size of a discontinuity within a plane. It can be crudely quantified by observing discontinuity trace lengths on exposed rock faces.

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