Shear in-situ stress

How to apply an in-situ stress state that include a shear stress component in PFC 6.0 version:
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Hello Xiongyu,

Applying in-situ stresses in DEM codes is a bit more involved then in continuum codes. However, PFC does have a command called ball tractions, that allows the user to specify a stress tensor or gravitational stress and PFC will modify ball-ball and ball-facet tractions to generate the provided state of stress. More information on this command can be found here - ball tractions command — PFC 6.0 documentation
Note this command applies to balls and rblocks, but not clumps. An example that uses this logic for rblocks is provided here - Data Files for “TunnelBBM” Example — PFC 6.0 documentation
Also, to check that the specified stress does indeed develop you can create measurement circles in your model to check the state of stress. More information on use and implementation of measurement circles are given here - Measure — PFC 6.0 documentation

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