GEOL 352 Lecture Notes - Lecture 11: Overburden Pressure, Friction
13 Nov 2020
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If the mohr circle touches the coulomb envelope for that rock it will break. C 0 = the cohesion of the rock how stuck together it is. Rocks that are already fractured usually have a c 0 of 0 to . 5 depending on how rough the fault is. = coefficient of friction determined for each rock based on the ratio of s and n. Tan = the tangent of the angle of the coefficient of friction angle between the line and x axis of the graph. Each circle represents a stress test on a rock where they know the max and min stress applied and at the time of failure. That mohr circle is plotted as a failure circle with a line for the angle of failure. They then connect the points of failure on a line the coulomb failure envelope.
