Influence of Grout Properties on the Tensile Performance of Rockbolts Based on Modified Cable Elements

Abstract

The grout annulus (GA) has a significant effect on the tensile performance of rockbolts in mining engineering. However, little research has been conducted to use modified cable elements to study this effect quantitatively. This paper used the modified cable elements in FLAC3D to study the effect of the GA on the tensile performance of rockbolts. The two-stage coupling law was used to simulate the behaviour of the GA. The stress had a linear relation with the slippage before the shear strength (SS). After the SS, the stress decreased exponentially. Numerical in situ roadway reinforcement cases were used to study the influence of the grout annulus on the tensile performance of rockbolts. The results showed that, when the SS of the GA increased from 3.2 MPa to 6.4 Mpa, the peak force of rockbolts increased from 247 kN to 425 kN. Moreover, when the SS of the GA increased from 3.2 Mpa to 6.4 Mpa, the distance between the position of the maximum tensile capacity and the external end decreased from 1.17 m to 0.81 m. Last, for the circular roadway, the peak force in rockbolts installed in the lateral side was 171.7 kN, which was significantly larger than the top side of 72.3 kN.

Numerical Computing Research on Tunnel Structure Cracking Risk under the Influence of Multiple Factors in Urban Deep Aquifer Zones

“…FLAC3D is a commercial finite difference numerical simulation software that includes 18 elastic and plastic constitutive models, five calculation modes, and various modes that can be coupled with each other. Compared with other software, FLAC3D has the advantages of fast solving speed and accurate calculation results and can simulate complex geotechnical problems, and has been widely used in the field of geotechnical engineering [33][34][35][36]. Wang [37] et al carried out a FLAC3D numerical simulation study of the deformation of a coal mine's deep buried track, and the calculation results are consistent with the field measurement results, with a small error (within 5%).…”

Special Issue “Construction Materials and Other Related Materials: Basic Theory, Applied Technology and Advanced Research Methods”

“…The impact of grout annulus (GA) [ 7 ] qualities on the tensile performance of rockbolts is emphasized by Chen et al’s research. Their paper assesses the impact of GA on rockbolt behavior via numerical simulations and in situ roadway reinforcement examples using modified cable elements.…”

“…Drawing upon the fundamental principles of mechanics, this approach continually incorporates the most recent research discoveries from mechanics and related fields, enhancing the disciplinary knowledge reservoir and adeptly tackling engineering challenges. This Issue encompasses theoretical and applied research contributions, with a particular emphasis on fostering collaboration across other disciplines [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ].…”

“…A classification scheme was created based on the themes and areas of attention of the study publications. The 15 papers in this Special Issue were divided into four general categories: Multi-Phase Materials and Enhancers, which investigated the analysis and evaluation of mechanical properties and performance enhancement methods for various materials [ 2 , 3 , 5 , 9 ]; Geotechnical Mechanics and Soil Engineering, which examined topics like rock mechanics, swelling pressure–suction relationship, grout properties, and excavation-induced ground response [ 1 , 6 , 7 , 14 ]; Concrete Mechanics and Materials, which concentrated on the effects of organic matter components, constitutive relationships, and concrete strength [ 4 , 8 , 15 ]; (Hydro-mechanics, Groundwater, and Slope Stability, involving the study of the time-dependent effect of seepage force on hydraulic fracture initiation and the failure mechanism of slopes during heavy rainfall events [ 11 , 12 , 13 ]. …”

“…Geotechnical Mechanics and Soil Engineering, which examined topics like rock mechanics, swelling pressure–suction relationship, grout properties, and excavation-induced ground response [ 1 , 6 , 7 , 14 ];…”