关键词: 动载作用, 锚固体, 预应力, 应力波:锚固破坏特征

Abstract:  In order to study the stress wave propagation law and failure characteristics of anchor solid un-der dynamic load, separate Hopkinson bars ( SHPB ) were used to conduct impact tests on anchor solidspecimens with different prestress and impact times , and the propagation law of stress waves and the char.acteristics of anchor failure were studied. The research results indicate that as the prestress increases , thepeak value of stress waves in the anchored surrounding rock gradually increases, and the attenuation rategradually decreases. Inereasing the prestress of the anchor rod significantly reduces the peak value of ten-sile waves at the free end of the anchor; As the prestress of the anchor specimen increases , the axial forceloss of the anchor increases faster, and the axial force loss rate shows a quadratic linear increase; whenthe prestress is small, there are more cracks in the surrounding rock at the anchoring free end. Undermultiple impacts, the crack distance is relatively close, and as the prestress increases, the degree ofdamage at the free end weakens; as the prestress increases, the maximum displacement during pullingdecreases. The original specimen that was not subjected to dynamic load does not show significant damageafter pulling. After dynamic load, as the preload increases , a certain degree of spliting failure occurs atthe anchor end , and the degree of splitting failure becomes weaker as the prestress continues to increase.

Key words:  dynamic load action , anchor solid: prestress: stress wave: anchorage failure characteristics