Abstract:
Compared with end anchoring, full-length anchoring has advantages in bearing capacity, but its application is limited due to the viscosity of resin anchoring agent and other factors. By means of laboratory test and theoretical analysis, a new type of cement-based anchoring material is proposed, which has the advantages of early strength and good thixotropy, which creates conditions for full-length anchoring. The results show that the mechanical properties of the new cement-based anchoring material are better than that of the traditional resin anchoring agent, and the highest drawing strength of the pre-stressed full-length anchoring system is more than 2 times as high as that of the common end anchorage. The damage location obtained by acoustic emission detection proved that the total damage events expressed a descending trend as the pre-tension force ascended, and the events distribution tended to gradually move to rod and bolt end, which resulted in plastic/yield injury of bolt. That is to say, the tensile strength of bolt is a decisive factor for bearing capacity of fully bonded bolting system under high pre-tension force.