Based on the actual earth-rockfill dam

the constant stress ratio path tests on wide grading gravelly soil

as the material of core wall

were performed

and the stress-strain property of wide grading gravelly soil under complex stress conditions was studied.It showed that wide grading gravelly soil exhibits elastic characteristics whenever under constant stress ratio path or constant stress increment ratio path. During dam construction

all the curve relationships of average principal stress p（or shear stress q） versus volume strainε

v

（or shear strainε

s

） can be simulated by power function

both the curve relationships ofε

v

versusε

1

andε

3

versusε

1

can be simulated by linear function.All th

e above relationships can be simulated by linear function during dam impounding.The study showed the relationship of stress and strain of wide grading gravelly soil under complex stress path.It’s an important message for further studying the stress-strain model on wide grading gravelly soil.