Response surface method analysis of the ultimate capacity of intelligent composite anchoring element

Response surface method analysis of the ultimate capacity of intelligent composite anchoring element

Článek recenzovaný mimo WoS a Scopus

The article deals with the analysis of the transfer mechanism of the force from the composite bolt to the rock surroundings. The ultimate capacity of anchoring member depends on relatively wide range of input parameters describing every part of system (rock mass, grout medium and the bolt). Above that the range of parameters of rock mass changes in the space. The axisymmetric Finite Element Model (FEM) of problem was constructed in the Plaxis2D, The Mohr-Coulomb failure criterion, described by the equivalent rock strength parameters determined by fitting an average linear relationship to the curve representing Hoek-Brown failure criterion, was used. On basis of this FEM model the statistical analysis based on the design of experiment (DOE) concept and the Response Surface Method (RSM) was carried out. The result of the full-factorial design and RSM analysis provide the regression model. It describes dependence of the bolt ultimate capacity Fy and corresponding deformation uy on the uniaxial compressive strength and Rock Quality Designation RQD. Results shows that RQD starts to have significant impact on the Fy from the level of σc above approx. 80 MPa. The deformation uy is affected by the RQD conversely. RQD starts to affect results below the level of σc = 80 MPa.

The article deals with the analysis of the transfer mechanism of the force from the composite bolt to the rock surroundings. The ultimate capacity of anchoring member depends on relatively wide range of input parameters describing every part of system (rock mass, grout medium and the bolt). Above that the range of parameters of rock mass changes in the space. The axisymmetric Finite Element Model (FEM) of problem was constructed in the Plaxis2D, The Mohr-Coulomb failure criterion, described by the equivalent rock strength parameters determined by fitting an average linear relationship to the curve representing Hoek-Brown failure criterion, was used. On basis of this FEM model the statistical analysis based on the design of experiment (DOE) concept and the Response Surface Method (RSM) was carried out. The result of the full-factorial design and RSM analysis provide the regression model. It describes dependence of the bolt ultimate capacity Fy and corresponding deformation uy on the uniaxial compressive strength and Rock Quality Designation RQD. Results shows that RQD starts to have significant impact on the Fy from the level of σc above approx. 80 MPa. The deformation uy is affected by the RQD conversely. RQD starts to affect results below the level of σc = 80 MPa.

Fiber Reinforced Polymer (FRP); Rock Quality Designation (RQD); Geological Strength Index (GSI); Design of Experiments (DOE); Response Surface Method (RSM); Pull-out resistance

Fiber Reinforced Polymer (FRP); Rock Quality Designation (RQD); Geological Strength Index (GSI); Design of Experiments (DOE); Response Surface Method (RSM); Pull-out resistance

ŠTEFAŇÁK, J.; MIČA, L.

2020

07.06.2018

Macedonian Association for Geotechnics

Skopje, Makedonie

Proceedings of the 16th Danube - European Conference on Geotechnical Engineering 07-09 June 2018: Getoechnical hazards and risks: Experineces and Practices. Volume 2

2509-7075

ce/papers

2

2-3

Spolková republika Německo

785

790

6

https://onlinelibrary.wiley.com/doi/abs/10.1002/cepa.766