87 / 2021-11-30 17:43:27

The influence of bond properties on rock bolt pull-out test

bonding agent,rock bolt,pullout test,bond properties,numerical modelling

Resource Development and Utilization of Underground Space > 3. Disaster Prevention and Control of Deep Underground Engineering

The interaction between bolt and the rock is one the key issue of its proper modelling. The effective bolt instalment depends on the bind/coupling type and its possibility to adhere to the rock in the drilled borehole and to the bolt surface. The paper consists of three sections, it firstly presents the results of laboratory research on three bond types: Fasloc – the bolt resin by DSI Underground, the concrete bond based on C20/25 cement and Verpensin organic mineral glue provide by DSI Underground. The bonds mechanical properties were checked and then test on bolts installed in the concrete were carried out. Above three bonds were used for the instalment. Their strength and bond stiffness were developed during the investigations. Based on the experiment data, numerical models were established based on Fasloc bonded specimen to investigate the mechanical behaviour of the three bond types. The results indicated that the numerical model could favorably support the pullout test result. The results of this study can deepen our understanding of the interaction between bolt and rock, especially when their mutual mechanical response is transmitted by different types of materials.