Georg Mandl's Rock Joints: The Mechanical Genesis PDF

By Georg Mandl

ISBN-10: 3540245537

ISBN-13: 9783540245537

ISBN-10: 3540264574

ISBN-13: 9783540264576

Rock Joints offers solely with the mechanical genesis of joints in rocks. it's aimed toward a coherent, severe and understandable presentation of the underlying mechanical methods of varied sorts of joints and joint structures. distinct care is taken to explain and quantify the position of excessive fluid pressures within the formation of joints. The heritage is an offshoot of the author's classes on "Genesis of Rock Joints" within the division of Rock Mechanics and Tunneling on the Technical collage of Graz, Austria.

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Example text

8 Aperture p° initial pore (dd) of parallel dykes in a horizontal, laterally pressure in wall constrained layer. rock p° stress 'Vh = pf  Vho exerted by the fracture pressure pf. e. in the x2 direction, straining is suppressed ('e2 = 0). Commonly, sedimentary rocks have some permeability, which allows the fracture pressure and the fluid pressure in the wall rock to interact, and thus to cause a gradual decrease of the fracture stress 'Vh after the formation of hydrofractures. In due course, we shall deal with this additional complication, but for now we shall concern ourselves with the simpler problem of hydrofracturing of nonporous rocks.

Pollard (1973) theoretically and in a series of experiments in which grease was injected into a stack of gelatin layers. 11A,B is taken from Pollard’s paper, and schematically show an experiment in which a grease The dyke-sill mechanism 41 sheet was intruded into gelatin at right angles to an interface. When the interface was well lubricated, virtually no shear stress from the advancing intrusion was transmitted across the interface, but the interface was deformed by normal stresses and a small gap was formed as shown in Fig.

As the fractures grow, they open and fill with fluid from the surrounding pore space, and the fracture fluid gradually attains the value of the pore pressure p inside the layer. We assume that, despite the increase in fluid volume due to the new fracture space, the pore pressure is maintained by the fluid contact with adjacent beds, at the level required for fracturing. We further assume that the smallest principal stress VIIIo = Vho acts along one horizontal direction only, allowing the formation of a single array of parallel vertical fractures perpendicular to the direction of Vho.

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Rock Joints: The Mechanical Genesis by Georg Mandl


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