FIELD EXPERIMENTAL STUDY ON ANCHORAGE PERFROMANCE OF GFRP AT CONSERVATION EARTHEN SITES

This paper reveals the performance of GFRP bolt at earthen sites. It attempts to overcome the limit of bamboo, wood and composite bolt. Furthermore it expands its application on the conservation. GFRP bolts with the diameters of 22mm and 25mm are chosen to do field anchorage experiments. The failure mode and maximum anchorage force are gotten by single and cycle loadings. Meanwhile, the variation and distribution of interface shear strain during the loadings are obtained by adding strain gauges along the bolt-mortar interface. The result shows that mortar-soil interface is the failure interface in both anchorage system, and GFRP bolt with the diameter 22mm can gain the maximum anchoring force of 50kN while GFRP bolt with the diameter 25mm can gain more than 120kN.The interface shear strain attenuates from the loading point to the end of the bolt, with the appearance of compressive strain at some points. Debonding never happens along the interface. In conclusion, GFRP bolt owns huge prospect in conservation of the carriers of earthen sites by replacing composite bolt.