Study on the load-supporting characteristic of the new type of support disc-type anchor under cyclic loading test

The new type of support disc-type anchor is an expanded body anchor with broad application prospects, and its load-bearing performance is significantly better than that of traditional anchors. However, there is a problem of premature shear damage in traditional support disc-type anchors. In order to solve this problem, this paper improves the traditional support disk anchor. It conducts cyclic loading tests on the new type of support disc-type anchors with different support disc diameters, support disc thicknesses, anchoring section diameters, and anchoring section lengths so as to simulate the repeated loads that the anchors are subjected to in actual projects. The function model suitable for predicting the bearing capacity of the new type of support disc-type anchors was derived by nonlinear fitting of some data using the function model and verified by comparing it with the measured data. A functional model predicts the bearing capacity of the new type of support disc-type anchors through nonlinear fitting of the data, validating the model against measured results. The study reveals that factors such as support disc diameter and anchoring section length have the most significant impact on pullout bearing capacity. In contrast, increasing the anchoring section diameter and shortening the anchoring section length may lower the pullout bearing capacity. The Q-s curve divides into five stages, where the lateral friction force between the anchoring section and the soil, along with the bulb resistance at the supported disc, collectively generates the bearing capacity of the new type of support disc-type anchor. The Belehradek function model proves most effective in describing the Q-s curve for these anchors during testing, demonstrating high accuracy and strong engineering practicality.