Reinforced concrete rod support for weak rocks
Abstract
Among the many types of supports used in mining, rod support on the principle of action, simplicity of design, cost‑effectiveness and versatility takes a special place and every year is gaining more and more recognition in world mining practice. The Department of Construction of Mining Enterprises of the Leningrad Mining Institute studied rod support as a means of combating floor heave of the bottom of mine workings in the mines of Donbass, the Moscow region and other basins. It is established that rod support can often prevent floor heave or significantly reduce its intensity. Widely used constructions of rod supports for strong and medium strength rocks are not suitable for strengthening weak rocks, as they do not provide good anchoring and have low load‑bearing capacity. Foreign mining literature recommends widely used and cheap reinforced concrete rods for strengthening weak rocks. During experimental testing of these recommendations it turned out that not all designs of reinforced concrete rods are effective in weak rocks, especially in rocks that lose mechanical strength when moistened. As a result of studying the principal features of known designs of reinforced concrete rods and analyzing the schemes of their operation in specific mining and geological conditions, fundamentally new designs were developed.
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References
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