Pull-out rheological test of anchorage system and evolution characteristic study of interfacial stress

摘要

Researching the evolution of anchoring interfacial stress distribution with time is particularly important to the long-term stability of geotechnical engineering. However, due to the limited experimental conditions, there is few relevant research on this subject. By using the modified rheological testing machine RLJW-2000, constant drawing force can be applied to anchorage system for a long time. According to the indoor pull-out rheological tests on wholly grouted bolts under different magnitude of drawing force, the results indicated that interfacial stress of bolts had rheological behavior and an unbalanced development in the axial direction. The significant rheological region constantly transferred with the increase of drawing force. The rheological region under low drawing force (50% of ultimate load and below) was at the bolt end. But at moderate drawing force (50% to 80% of ultimate load) the rheological region transferred to the middle. And under high drawing force (80% of ultimate load and above) the region then back to the bolt end again.