Abstract:The dislocat ion of rockm ass is fo rm ed and appears as the shear dislocat ion of exp lo sive ho le o r bo reho le w ith large diam eter as the foundat ion slope is excavated and the in2situ st resses are reacted to som e ex ten t. The dynam ic equ ilib rium theo ry of in2situ st resses is estab lished. The in2situ st resses can be back determ ined w ith the dislocat ion in given area. The in2situ st resses can be concen t rated, t ran sm it ted, and sp read, w h ich af2 fect s the stab ility of slope.