Constitutive model of anchorage interface and its application on timeliness analysis in underground engineering

摘要

The creep property of anchorage interface is one of most important problems in analysing timeneffect of anchorage in underground engineering. In this paper, aiming at the defects of hardncontact formulation in normal direction and discontinuity from bond to slip in tangentialndirection at anchorage interface when studying on the anchoring mechanism, a contactnformulation which is an exponential softened pressure–overclosure relationship in normalndirection and a continuous non-linear constitutive model in tangential direction are proposed.nThe model solves the problem of converging difficultly and reflects the whole process of shearncreep behaviour truly and reasonably because of its consideration of normal stress. By thenfurther development of ABAQUS, the non-linear creep model of anchorage interface is appliednto analyse time effect of anchorage engineering. The main achievements are conducted asnfollows: anchor stress will increase with creeping effect of anchorage interface, and thenlocation of anchorage peak stress will change and move towards the far end of anchor with thenlapse of time. This paper provides the theory basis for deeply researching the reliability ofnanchorage in underground engineering.