Abstract
In order to analyze the influence of damage caused by corrosion on anchoring performance of a rock mass with different joints, the anchored rock mass specimens with different joints distribution were prepared. An electrochemical accelerated corrosion test of specimens was carried out, and the mechanical test of them under different corrosion time was also investigated. The results showed that the pitting corrosion is the main form of the anchor bar corrosion of an anchoring rock mass with different joints, and the shape of the etch pit is reverse semi‐ellipse. With the increase of pitting ratio, the ultimate bond strength and the corresponding slide distance decrease gradually. The effects of pitting ratio on the slide distance of the anchor bar in an anchored joint rock mass are insignificant, but these on the bond strength of it are significant. The bond‐slide model of the anchored joint rock mass with different pitting ratios was established. The research results of this paper can provide reference for analyzing the corrosion damage of a complex anchored joint rock mass in practical engineering and a theoretical basis for the design optimization of anchoring support in the complex jointed rock mass.
Highlights
Anchorage system, as the key element of underground engineering structure, has gradually become the preferred method for the engineering reinforcement of rock slopes, tunnels, as well as in deep foundation pit and other projects [1,2,3,4]
The anchorage performance tests of the anchored joint rock mass under different pitting ratios are carried out. e conclusions are as follows: (1) Because the anchored joint rock mass specimens are directly immersed in the seawater, the corrosion firstly occurs at the position of the joints connecting with the anchored bar and develops radially and axially. e etch pit opening is upward, and the shape of which is reverse semi-ellipse
(3) For the semi-penetrating joint rock mass specimens, the rock mass connecting with the anchored bar at the effect range of joints plays a role of protecting the anchored bar
Summary
As the key element of underground engineering structure, has gradually become the preferred method for the engineering reinforcement of rock slopes, tunnels, as well as in deep foundation pit and other projects [1,2,3,4]. There are few studies on the durability of the anchorage system, but a large number of theoretical models [10], numerical simulations [11], and laboratory tests [12] have been carried out on the corrosion of steel bar in reinforced concrete structure. Some achievements have been made in the research on the degradation of bond properties caused by corrosion of the steel bar and the durability of anchor system, but there are relatively few studies on the corrosion damage of different anchored joints rock mass. Based on the accelerated corrosion test of the anchored joint rock mass, the effect of pitting ratio under different joints distribution on the mechanical properties of anchorage system was studied. A bond-slide model of anchored rock mass specimens for different joints distribution was established. ese results can be used as a basis and reference for predicting the degradation of mechanical properties of different anchored joints rock mass
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