Laboratory studies of longitudinal and transversal deformations of resingrouted and rope anchors
DOI:
https://doi.org/10.33271/crpnmu/84.108Keywords:
anchor fastening, mining, laboratory research, longitudinal deformations, transverse deformationsAbstract
Purpose. Experimental determination of the patterns of longitudinal and transverse deformation of resingrouted and rope anchors under increasing load. Methods. Laboratory tests were performed on a standardized test bench with stepwise application of lateral and axial loads in the range of 10–50 kN. At each stage, the longitudinal and transverse deformations of resingrouted and rope anchors were recorded, followed by the construction of load-deformation relationships and their comparative analysis. Findings. It was found that with an increase in lateral pressure, the transverse deformations of the resingrouted anchor increase from 0.004–0.005 to 0.020–0.022, while for the rope anchor they reach 0.030–0.035. Thus, at maximum loads, the transverse deformations of the rope anchor exceed the corresponding indicators of the resingrouted anchor by approximately 1.4–1.6 times. When studying longitudinal deformations, it was found that for resingrouted anchors, their values vary from 0.003–0.004 at minimum load to 0.018–0.020 at maximum load. The rope anchor shows a more intense increase from 0.006–0.008 to 0.040–0.045 in the same force range. At loads above 30 kN, the difference between the deformation curves becomes more pronounced, confirming the lower axial stiffness and higher deformability of the rope anchor. The results obtained indicate significant differences in the mechanisms of operation of the anchors under study. Originality. For the first time, quantitative patterns of longitudinal and transverse deformation of resingrouted and rope anchors have been established during a stepwise increase in lateral and axial loads. Differences in their stiffness characteristics and load perception mechanisms have been identified, which broadens the understanding of the deformation behavior of anchor fastening systems. Practical implications. The results obtained make it possible to use the established experimental dependencies to justify the choice of anchor type and anchor fastening parameters depending on the load conditions. The data obtained can be used in the design of two-level anchor systems for preparatory workings, taking into account their stiffness and deformation characteristics.References
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