The simulators explained up to date assume that the horizontal top of the bench stretches reasonably far beyond the last row of the blast.  The option <Wall Control> allows the user to simulate the shock wave stress contours in the presence of a final wall located at the back of the bench, at a level higher than the present bench.  This final wall is located at distance D from the face of the last row of the present blast; its base is at the level of the top of the present bench.  The user enters the value of D in the slot <Distance Wall to Face>.  This allows him to carry out studies to control the quality of the final wall, either using To for a reasonably homogeneous rock mass, or using a reduced value T(joint) of the dynamic strength for the joints in a rock mass with weakly crystallized joints.