Experimental Study of Temperature Effect on Binding Properties of Resin Anchors

This study analyzes the temperature effect on the anchoring behavior of the resin anchoring agent and bolt. Fully resin anchoring specimens consisting of surrounding rock-resin anchoring agent-bolt were designed. Through push-out experiment of specimens at 25 °C, 30 °C, 40 °C, 45 °C and 55 °C gradient temperature of, variation laws of anchor force and anchoring interfacial shear stress response rules along the anchor length direction were obtained. Results showed that, with temperature increase, maximum anchoring force and the average anchoring interface shear stress became smaller, Moreover, the failure mode of the anchoring interface gradually changed from brittle failure to plastic failure similar to rock. Under same temperature, the shear stress shows obvious non-uniform distribution, and the shear stress gradually transferred away from the load side. With the distance from load side increased, the shear stress became smaller. The interfacial shear stress tends to power function distribution with the increase of temperature.