Engineering Rock Mechanics

22 Geological setting moved about. Thus, the rock blocks could be well developed and hence more likely to be unstable. 42.5 In t ...

Questions and answers: geological setting 23 geological environments will have different characteristics and we can anticipate m ...

24 Geological setting relied upon. I also believed this to be the case and subscribed strongly to this view for many years. Howe ...

Questions and answers: geological sefting 25 model which is based on the geological and engineering rock mechanics principles. 4 ...

26 Geological setting that stress is a tensor quantity and six independent components are required to characterize the stress st ...

3.1 Understanding stress To become at all proficient in engineering rock mechanics, it is essential to understand the concept of ...

28 Stress Fcose Figure 3.1 Resolution of a force. are not consciously encountered in daily life. This means that we do not have ...

Understanding stress 29 0, acts over this area, A normal stress = force/area, on = F/A noma1 stress = Fcos@,(AkosB)=(F/A) cos2@ ...

30 Stress the subject of Chapter 4. The in situ stress field usually governs the boundary conditions for the rock mechanics prob ...

Questions and answers: stress 31 43.2 When is a matrix symmetrical? Why is the stress matrix sym- metrical? A3.2 A term in the i ...

32 Stress 43.5 What is a principal stress plane? What is a principal stress? A3.5 A principal stress5 plane is a plane on which ...

Questions and answers: stress 33 LIniuxiu2 stress. One principal stress is applied, i.e. one principal stress has a non-zero val ...

34 Stress where a:t+W = A B axx + OX,’ and so on. However, when II stress tensors have been specified by the magnitudes and dire ...

Questions and answers: stress 35 Note that the components of the first stress invariant, 11 = a,, + a,, + a,, = 01 + a2 + a3, ar ...

36 Stress By similar considerations in the y and t directions, we also have -+-+-- atxy aUYY atzy - () aY aY aY -+-+-=O ab aryz ...

Additional points 37 3.3 Additional points Stress is important for many aspects of rock mechanics and is relevant to many of the ...

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In situ rock stress 4 4.1 The nature of in situ rock stress Having explained the concept of stress in Chapter 3, we now consider ...

40 In situ rock stress In the first case, the six components of the stress state are the six components of the stress tensor wit ...

The nature of in situ rock stress 41 Compressive stress Tensile stress in the surface lavers in the core Section through car win ...