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.

In th is paper, by u sing the non2linear visco2elast ic model based on rock m e2
chan ical test s, the t im e2dependency of ground characterist ic cu rve of tunnel is invest igat2
ed. It is found that the variat ion of characterist ic cu rve w ith t im e is clo sely related to the
t im e dependen t behaviou r of rock, especially the loading rate dependen t behaviou r and
po st failu re region behaviou r. A nd by sim u lat ion of suppo rt react ion line, the relat ion be2
tw een ground characterist ic cu rve and suppo rt react ion line is discu ssed.

The basic idea and f ram ewo rk are p resen ted fo r the num erical sim u lat ion of A E
in rock failu re. Som e impo rtan t p rob lem s are discu ssed b rief ly w ith the examp le of f in ite
elem en t m ethod , such as discret izat ion of elem en t s, assignm en t of elem en t param eters,
and calcu lat ion of A E rat io. A p ract ical compu tat ion examp le is given, f rom w ho se resu lt s
the A E sequences fo r t im e and space are ob tained.

　U n loading non linear rock m ass m echan ics, one new concep t in geo techn ics, is
pu t fo rw ard by the au tho r in th is paper, and w ho se m ain research ing con ten t s are dis2
cu ssed in the paper. The resu lt s iden t ify that there is in t rin sically dist inct ion betw een un2
loading non linear rock m ass m echan ics and no rm al loading one. The excavat ion of rock
slope is under the un loading condit ion s, and the loading condit ion s as befo re can no t m an i2
fest the essen t ial featu res of the slope. A cco rding to cases analysis abou t bo th natu ral and
art if icial cu t rock slopes in un loading non linear rock m ass m echan ics, it is discovered that
the research ing resu lt s in th is m ethod are w ell acco rdan t w ith actual featu res of rock
slopes.