Research and application of time-varying law of anchoring force of split-set bolt based on field measurement

Split-set bolt is widely used in supporting stope and roadway surrounding rock metal mines. The maximum pull-out force generated by the relative slippage between anchor drill hole can serve as an indicator for assessing its anchoring force, of grouted exhibits certain regularity over time. This test was carried out at different time points after construction split-set using drawing equipment, variation law with studied. on per unit area selected a evaluation parameter, reinforcement support scheme optimized from aspects stress release initial stage excavation stability rock. convergence monitoring measurement method adopted, same to verify feasibility scheme. effectiveness verified comparing roof subsidence lateral two walls schemes.