It is verified that the basic equations used in the three dimensional displacement discontinuity method (3 dim. DDM) are coincided with the so-called physical dislocation solutions. There may occur slight error in the evaluated deformation whenthis method is applied to some special problems such as Cerruti's one (see Figs. 4, 5).
Formulation to solve tabular inclusion problem applying the 3 dim DDM is derived. Its validity is examined by solvingthe flat spherodial inclusion problem and by comparing with the analytical result, as shown in Fig. 8.
3 dim. DDM, which belongs to the category of the boundary element method, yields less accurate results when it is appliedto the problem where boundaries are adjacent to each other. Simplified model is proposed to treat the problem of closelyadjacent mining panels and its validity is confirmed by solving typical problem shown in Fig. 10.