GEOE 413 Lecture Notes - Lecture 6: Core Recovery Parameters, Shotcrete, Ultimate Tensile Strength
17 Oct 2016
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All classifications except gsi is supposed to give you this. Our data gave rmr=7. 53lnq+55. 6: fit gets worse with just q. Rqd alone was first attempt at an empirical design. Rock reinforcement: elements mobilise and conserve the inherent rockmass strength so that the rock becomes self-supporting: mechanically anchored bolt, fully coupled bolts. E. g. grouted rebar (cement grouted: shotcrete lining. Often used to keep tunnels stable: reinforced shotcrete fibres give reinforced tensile strength. Mesh large deformations, greater install effort steel or polymer fibre resistance to cracking easy to apply: arches. Diagram showing correlation between rqd and case histories. What you need for a stable tunnel depending on tunnel width and rqd: not officially used much but implicitly known. Can give more detailed recommendations than rqd. One attempt to use a 10m rock tunnel, recommendations were made depending on rock quality. Consider geologically/ geomechanically distinct zones separately, thereby allowing adaptation of design to local conditions. Much more case study data using q.
