Anchor performance of wood bolt fully grouted by PS-(F+C) slurry in rammed earth sites

Based on laboratory physical model and field experiments which consisted of pullout tests and strain monitoring on bolt-grout interface, wood bolts fully grouted by potassium silicate solution-(fly ash + silt) (PS-(F+C)) slurry in rammed earth were researched on its anchor capacity, failure mode, shear stress distribution and transfer along the bolt-grout interface. Experimental results showed that ultimate pullout force in laboratory (24~38 kN) is far larger than that in field (2.5~8 kN). Low elastic deformation and high plastic deformation of anchor system result in strong ductility. In the process of loading, multi-peak stress distributes along bolt-grout interface and higher stress value usually appears near anchor end, meanwhile, compressive stress occasionally emerges in monitoring interface. Results proved that such anchor system benefits from advantages of both the tensile anchor and compressive anchor. In conclusion, with considerably physical and mechanical compatibility to rammed earth, the anchor system is fairly suitable to conservation of rammed earth sites. ©, 2015, Editorial Department of Journal of Sichuan University. All right reserved.