GEOE 413 Lecture Notes - Lecture 2: Modulus Guitars

• School: Queen's University
• Department: Geological Engineering Courses
• Course: GEOE 413
• Professor: Mark S Diederichs

Document Summary

2d stress tensors involve 3 distinct pieces of information. 3d stress tensors involve 6 pieces of information. With both the 2d and 3d stress tensors there is an orientation in space where there is a maximum ( 1) and minimum ( 3) value. The numbers representing these values are called eigenvalues and the arrows representing these numbers are called eigenvectors. When putting in a tunnel, high stress is horizontal (walls are more likely to cave in) Minimum stress of a tunnel is due to the air pressure going through the tunnel. Mining in managing a failing rockmass if your mine is not failing you are not doing it right. Displacements in a rock before yielding or failure is controlled by rock stiffness. The simplest expression of in situ stress is denoted by k. Early on in a, for example mountain"s life the vertical stress is greater than the horizontal stress making k<1.