By Walter Wittke
This ebook makes a speciality of the basics of rock mechanics as a foundation for the secure and cost effective layout and building of tunnels,
dam foundations and slopes in jointed and anisotropic rock.
It is split into 4 major parts:
- basics and models
- research and layout methods
- Exploration, checking out and monitoring
- purposes and case histories.
The rock mechanical types offered account for the impact of discontinuities at the stress-strain habit and the permeability of jointed rock lots.
This e-book is for:
- Civil- and Mining-Engineers
- scholars within the similar fields
Read Online or Download Rock Mechanics Based on an Anisotropic Jointed Rock Model PDF
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Extra info for Rock Mechanics Based on an Anisotropic Jointed Rock Model
The intersection of a discontinuity running through the center of the reference hemisphere and the surface of the lower reference hemisphere is a great circle, and the normal of the discontinuity intersects the surface of the lower reference hemisphere at its pole (Fig. 26, lower). 7 Rock Mass 25 To obtain a two-dimensional representation of poles the stereographic projection of the lower reference hemisphere into a horizontal plane is carried out in a way that the projection plane has the same area as the surface of the lower reference hemisphere.
Two Young’s moduli E1 and E2 characterize the deformability parallel and perpendicular to the structure planes. Parallel to a structure plane the deformability is assumed to be isotropic. A structure plane is therefore called an “isotropic plane”. The shear modulus G2 describes the deformability for a shear loading parallel to the isotropic plane. Furthermore, two Poisson’s ratios ν1 and ν2 are needed. 3 Deﬁnition of the elastic constants of an intact rock with planar grain structure and transversely isotropic behavior (Wittke et al.
18). The elastic behavior of such rocks is therefore normally 42 3 Stress-Strain Behavior of Jointed Rock anisotropic and can be described by transverse isotropy. Such an elastic behavior is specified by five independent elastic constants. Two Young’s moduli E1 and E2 characterize the deformability parallel and perpendicular to the structure planes. Parallel to a structure plane the deformability is assumed to be isotropic. A structure plane is therefore called an “isotropic plane”. The shear modulus G2 describes the deformability for a shear loading parallel to the isotropic plane.