Experimental Study on the Deformation and Failure Characteristics of Anchor under Graded Loading and Corrosion

Abstract

During the entire life cycle of rock and soil anchors, owing to the influence of adverse factors such as the working environment, load change, and anchor performance degradation, the working load of the anchor will continue to increase and the mechanical properties will continue to deteriorate, which significantly affects the safety and stability of rock and soil anchors. Therefore, this study focuses on the deformation and failure characteristics of anchors under loading and corrosion conditions by means of indoor simulation tests under laboratory conditions. The results indicate the following. (1) There are obvious cracks on the surfaces of specimens 2# and 10#. In the two groups of specimens, the corroded bolt surface exhibited a corrosion phenomenon. This indicates that the corrosion environment conditions cause a certain degree of damage to the anchored rock mass. (2) Under the same gradient load condition, three observable cracks were found in the 10# anchorage specimens and one observable crack was found in the 2# anchorage specimens. Therefore, it is clear that the damage degree of the anchor increases with an increase in the corrosion time. (3) Under the condition of corrosion environment, the strain in the lower part of the specimen is generally greater than that in the upper part of the specimen, and the failure of this group of specimens in the loading process is mostly splitting failure, which is basically generated along the trend of the strain nephogram, and shear failure occurs with the extension and diffusion of cracks.

Progress and Perspectives of Geotechnical Anchor Bolts on Slope Engineering in China

“…Wang Y. et al (2019) showed that the anchor head is relatively fragile through the collection and analysis of field samples. Sun et al (2021)demonstrated that shear failure occurs with the extension and evolution of cracks by means of laboratory simulation tests. As a main defect of the prestressed anchors, it is necessary to study the mechanism of prestressing loss (Gao et al, 2021).…”

Mechanical Characterization of Anchor under Uniaxial Compression Loading Conditions

“…Zhao et al [12] studied the creep deformation characteristics of red sandstone under uniaxial compression and multi-stage loading. sun et al [13] studied the failure characteristics of anchors under multi-stage loading and corrosion by indoor test. Zheng et al [14] conducted a uniaxial compression test on fiber reinforced concrete, and discussed the influence of fiber type and fiber content on the uniaxial compressive strength of fiber reinforced concrete, showing nonuniformity and nonlinearity.…”