Compression only springs of foundation

I am trying to use compression only springs to model mat foundation with larger overturn moment.  When defining the compression only spring, the program can only define the spring in one direction of X, Y or Z.  My question is when we define the spring in one direction, say Y, what are the restraint condition in other two directions of X and Z.  My model is unstable.  I am wondering if I have properly defined the restraint condition of the joints.