We present calculations of forces in a static two dimensional sandpile model. The model is very simple supposing spherical, identical, rigid particles on a regular triangular lattice, without friction and with unilateral spring-like contacts. We use a symbolic calculation software to get exact results for several different orientations of the lattice and for different types of supporting surfaces. Special attention is given to the stress tensor and pressure on the bottom of the pile due to their importance in recent works.
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