According to the anti-pullout anchor experimental data

the dynamic broken line model that the anchorage load transfer properties changing with the depth is presented. Firstly

the anti-pullout anchor experiment

including the main parameters and test data

is briefly introduced. Based on that

anchorage load transfer curves of different depths are analyzed and dynamic broken line used for fitting calculation is proposed. Then

by using dynamic broken line model and anchorage axial force and displacement energy method formulas

a matching computation of test data is carried out. The results show that the calculation results coincide with the experimental data. It vindicates that using the dynamic broken line model in fitting calculation is reasonable. At last

applicable conditions and the supplementary role of the dynamic broken line model in test research and engineering design are discussed. The distribution of different depth strata geostresses is considered by the dynamic broken line model. Geostress is not directly involved in the calculation

but because of its parameter setting based on the test and relatively simple iterative calculation; the method provides a feasible reference to compute the anchor bearing capacity more sophisticated.