TY - JOUR
T1 - 3D bolted cohesive element for the modelling of bolt-reinforced rough rock-shotcrete interfaces
AU - Dong, Xiangjian
AU - Karrech, Ali
AU - Elchalakani, Mohamed
AU - Qi, Chongchong
AU - Manca, Mirko
PY - 2020/9
Y1 - 2020/9
N2 - In this paper, we develop a novel 3D computational method that describes the behaviour of rock bolts and rough rock-shotcrete interfaces as support systems. Specifically, a Finite Element model has been formulated and implemented using the user-defined element (UEL) subroutine with ABAQUS. The input parameters of the bolted cohesive model are determined experimentally. Once the location of the bolts is defined, the overall force-displacement performance of the system can be simulated. In addition, the rough interface is modelled as a combination of ‘bond’ and ‘Coulomb-friction’ laws where the cohesive stiffness reduces with degradation. To validate the model, we compared its outputs to the results of direct shear and bolt pull-out tests; a good agreement between the two approaches has been obtained. In addition, a mesh independent result is observed for the overall force-displacement response, which makes our model particularly fast and efficient. Furthermore, we conducted a parametric study by investigating the effects of number of bolts, bolt installation angle and pretension on the overall behaviour.
AB - In this paper, we develop a novel 3D computational method that describes the behaviour of rock bolts and rough rock-shotcrete interfaces as support systems. Specifically, a Finite Element model has been formulated and implemented using the user-defined element (UEL) subroutine with ABAQUS. The input parameters of the bolted cohesive model are determined experimentally. Once the location of the bolts is defined, the overall force-displacement performance of the system can be simulated. In addition, the rough interface is modelled as a combination of ‘bond’ and ‘Coulomb-friction’ laws where the cohesive stiffness reduces with degradation. To validate the model, we compared its outputs to the results of direct shear and bolt pull-out tests; a good agreement between the two approaches has been obtained. In addition, a mesh independent result is observed for the overall force-displacement response, which makes our model particularly fast and efficient. Furthermore, we conducted a parametric study by investigating the effects of number of bolts, bolt installation angle and pretension on the overall behaviour.
KW - Bolt reinforcement
KW - Bolted cohesive element
KW - Rough interface
KW - User element subroutine
UR - http://www.scopus.com/inward/record.url?scp=85085730887&partnerID=8YFLogxK
U2 - 10.1016/j.compgeo.2020.103659
DO - 10.1016/j.compgeo.2020.103659
M3 - Article
AN - SCOPUS:85085730887
SN - 0266-352X
VL - 125
JO - Computers and Geotechnics
JF - Computers and Geotechnics
M1 - 103659
ER -