Mohr-Coulomb Diagram

With the Mohr -Coulomb diagram tool, you can define the azimuth of the borehole to plot a 3D Mohr-Coulomb diagram defined by the principal stresses at that point.

Using the tool

1. On the form, enter the Azimuth of the borehole wall. Press Enter or Tab to activate the (Re)Calculate button.
2. Click (Re)Calculate to generate the Mohr-Coulomb diagram, or re-calculate the existing diagram with the new input.
3. Click Show to view the Mohr-Coulomb diagram in the Mohr Diagram View.

The lock icon on the form can have different colors and states:

	Open  When the lock is green and in the open position, the associated algorithm is automatically executed when a change is made to the data’s input. Current status of output data is 'up-to-date'.
	Locked, No Changes  When the lock is blue and in the locked position, the associated algorithm is not updated when a change is made to the data’s input. Current status of output data is 'up-to-date'.
	Open, Red  When the lock is red and in the open position, the associated algorithm is automatically executed when a change is made to the data's input. Current status of output data is 'not-up-to-date', meaning the algorithm was already executed but output data was not calculated/updated due to some errors or lack of input data.
	Locked, Red  When the lock is red and in the locked position, the associated algorithm is not updated when a change is made to the data's input. Current status of output data is 'not-up-to-date'. To apply the updates, you need to click the associated (Re)Calculation button.

You can display one Mohr diagram at a time. The Mohr diagram shown below is for a compressive model; therefore, the red failure line is inclined. If the Mohr diagram were for a tensile model, the red failure line would be vertical. In the case shown, the selected orientation is within a breakout, and therefore, the failure stress state crosses the Coulomb failure line on the Mohr diagram. When in compressive mode, the failure line always corresponds to the 2D linear Coulomb failure criterion regardless of the failure model selected in the input window.