مدلهاي تحليلي براي مطالعه مكانيزم رفتار و كاركرد انواع سنگدوزهاي تزريقي

Theoretical approaches for analysis and evaluation of grouted rockbolts types behavior mechanism.

Rock-support interaction concepts, which are applied to support system such as concrete lining, steel sets and ungrouted rockbolts, can not be applied to grouted rockbolts, and ground response curve and support reaction line can not be plotted independently. In this paper, with consideration of a non-linear strength criterion for rock mass and on the basis of brittle and strain softening material behavior models and rock-support interaction concepts, theoretical approaches for analysis and evaluation of passive and active (pretensioned) grouted rockbolts behavior are conciselypresented. In theses methods, the ground response curve which has been reinforced with grouted rockbolts is also derived and plotted for circular tunnel under hydrostatic stress field to determine the effect and usefulness of each of these systems in tunnel stabilization and convergence control. Researches show that passive and active grouted rockbolts will really control the tunnel convergence if they arenʹt yield. Active grouted rockbolts (if no yielding occur) also control the convergence 10% to 20% greater in comparison with passive types.