A numerical model of fully grouted bolts considering the tri-linear shear bond–slip model

Experimental Study on Bond-Slip Behavior of Bamboo Bolt-Modified Slurry Interface under Pull-Out Load

“…A trilinear bond-slip model was again considered for the rockbolt-cement grout joint interface, the model parameters are calibrated by identifying the different stages of load-displacement curves at the loading end. Ma et al [15] and Martin et al [16] analyzed the whole process of anchor bolt slippage by using trilinear bond-slip model, which is suitable for the interface of high strength materials such as metal and cement mortar. However, the analytical model used by Li and Stillborg [11], Ren et al [14], Ma et al [15], and Martin et al [16] only focused on rockbolts without free end slip and ignored the slip of the bolt free end.…”

“…Ma et al [15] and Martin et al [16] analyzed the whole process of anchor bolt slippage by using trilinear bond-slip model, which is suitable for the interface of high strength materials such as metal and cement mortar. However, the analytical model used by Li and Stillborg [11], Ren et al [14], Ma et al [15], and Martin et al [16] only focused on rockbolts without free end slip and ignored the slip of the bolt free end. Recently, Biscaia et al [17] analyzed the mechanism behavior and debonding process of the FRP-to-concrete interface on shear tests with the FRP plate submitted to a tensile load in one of its ends, three linear and one exponential bond-slip models are employed in the numerical process, and the results are analyzed and compared.…”

Reinforcement mechanism of rockbolt system for underground excavation

“…The bond stress versus slip displacement curve can be described using a trilinear bondslip model proposed by Benmokrane et al (1995). As shown in Figure 3-2(c), a trilinear bond-slip model consists of an ascending branch up to the peak stress at (τmax, where: Δδ is the slip between the bolt and rock, k and cb are constants which can be given as (Ma et al, 2016), when 0 ≤ Δδ < Δδ1 :…”

“…Numerical studies have been carried out to simulate the interaction between rockbolt and rock mass (Sari and Pasmehmetoglu, 2004;Bobet and Einstein, 2011;Deb and Das, 2014;Ma et al, 2016;Nie et al, 2014a;. Among these studies, the discontinuous element method becomes a primary choice when dealing with the study of reinforcement mechanism of rockbolt as it can simulate the the mechanical behaviour of an assembled rock blocks.…”

Experimental and computational study on rock bolt modelling and its application on a new type of energy-absorbing rock bolt

“…In the development of rock bolt element by DDA, firstly developed the rock bolt element in DDA, and it was further enhanced by Ma et al (2016) and Nie et al (2018) by introducing the tri-linear shear bond-slip model. A brief introduction of rock bolt theory adapted to the current DDA code is presented in the following.…”