Abstract: No explicit result has been achieved on the research of time-effect on uplift bearing capacity of drilled grouting pile in the ground of sandy soil and weathered sandrock. The mechanism of time-effect is analyzed by the data from the test and the construction draft of drilled grouting pile. It is shown that the time-effect of drilled grouting pile on sandy soil is significant under the effect of too thick lateral mud, even strong than cohesive soil. The uplift bearing capacity increases more quickly in the early period than that in the later. In order to make good use of the uplift pulling capacity, it is suggested that the resting phase before the pile test should be lengthened properly.

Key words: drilled grouting pile, time-effect, weathered rock, time of repose, uplift bearing capacity, lateral resistance