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The present study examines the working conditions of fully grouted bolts used for the construction and expansion of high slopes. On the basis of a pull out destructive test, the work load and the ultimate load are obtained on site, and the Flac3d numerical simulation method is employed to determine the axial force distribution and the effective anchor length. The test results show that (1) the Q-S (load-displacement) curve of the bolt displays a certain degree of deformation coupled with the creep of the surrounding rock; (2) the working load of the bolt is closely related to the sliding deformation trend of the slope, while the ultimate load depends on the design parameters of the bolt and the lithology of the slope; (3) the distribution of bolt axial force is characterized by a single peak along the bolt length and the effective anchorage length of the bolt is 3 m; (4) after 20 years, the bolt’s ultimate load has a maximum loss of 31.94%.

A Pull-Out Test Study on the Working State of Fully Grouted Bolts