The mechanical response of the anchorage system under intermediate strain rate conditions is the key issue in the analysis and evaluation of the safety of the support structure when subjected to earthquake

considering that the bolt-grout interface is the weakest element in the anchoring system generally; its mechanical behavior under dynamic load are extremely important. Therefore

direct shear tests of bolt-grout interface are conducted under different levels of shear rate(0.06-30mm/min). The effects of shear rate on peak shear stress

shear strength parameters and normal deformation behavior under different normal stresses are analyzed detailedly. The test results show that under intermediate strain rate conditions

with the increase of shear rate

the peak shear stress first increase rapidly then almost keep constant

whereas cohesion and normal displacement show a change trend of first increase and then decrease. The test results can provide basic data for the dynamic response analysis of the anchorage system under intermediate strain rate condition.