Abstract: The long-term strength of anchored rock mass is the basis and hot research of surrounding rock stability control. Taking the rock-anchor composite structure as the research object， the time-space evolution law of strain in the anchor was studied through the pull-out creep test of the full long-term aging equation bonded anchor under long-term load by using the embedded strain technology. Then， the polynomial was proposed as the theoretical basis of the pull-out creep aging equation. The results showed that the internal creep curve of rock-anchor composite is not monotonically increasing， but has multiple peaks； As time goes on， the influence of load on the strain development trend of different parts of the anchorage section is also different， which shows that the front strain at the initial stage of loading has a positive response， and the strain at the end of anchorage tends to be consistent with that at the front as time goes by； The axial strain at the same part of the anchorage section is generally greater than the transverse strain； Compared with the Burgers model， the polynomial aging equation can better describe the creep process of the anchorage section of rock-anchor composite. The research results can provide theoretical basis for stability control of anchorage engineering.

Key words: Anchorage body, Creep, Bolt drawing, Internal strain.