Performance of fully encapsulated rebar bolts and D-Bolts under combined pull-and-shear loading

Chen, Yu; Li, Charlie Chunlin

doi:10.1016/j.tust.2014.09.008

Cited by 90 publications

(27 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Natural rock masses contain many micro-and macrocracks, which lead to different physical and mechanical characteristics [33][34][35][36][37][38][39][40][41]. Miller divided the stress-strain curves of rocks with different physical and mechanical properties into six categories [42,43].…”

Section: Specimen Preparation and Test Methodsmentioning

confidence: 99%

Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock‐Like Materials

Lin

Zhang

Wang

et al. 2020

Advances in Civil Engineering

View full text Add to dashboard Cite

Creep property is an important mechanical property of rocks. Given the complexity of rock masses, mechanical parameters change with time in the creep process. In this work, a nonlinear function for describing the time-dependent change of parameters was introduced and an improved variable-parameter nonlinear Nishihara shear creep model of rocks was established. By creating rock-like materials, the mechanical properties of rocks under the shear creep test condition were studied, and the deformation characteristics and long-term shear strength of rocks during creep were analyzed. The material parameters of the model were identified using the creep test results. Comparison of the model’s calculated values and experimental data indicated that the model can describe the creep characteristics of rocks well, thus proving the correctness and rationality of the improved model. During shear creep, the mechanical properties of rocks have an aging effect and show hardening characteristics under low shear stress. Furthermore, according to the fact that Gk of the nonlinear model can characterize the creep deformation resistance, a method to determine the long-term shear strength is proposed.

show abstract

Section: Specimen Preparation and Test Methodsmentioning

confidence: 99%

Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock‐Like Materials

Lin

Zhang

Wang

et al. 2020

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…At present, bolt support has caused widespread concern and is widely used in deep mines [17][18][19][20][21][22]. However, under the conditions of deep mining, as rocks are broken or loosen with bad bolt ability, the bolt support is difficult to satisfy the requirement of support for deep rock roadway with high stress and large deformation.…”

Section: Introductionmentioning

confidence: 99%

The Load Capacity Model and Experimental Tests of a New Yielding Steel Prop

Chen

Yang

et al. 2017

Mathematical Problems in Engineering

View full text Add to dashboard Cite

As the mining depth increases year by year, the deformation and failure of deep roadway become more and more serious, and new support equipment with high supporting force and yieldable character is quite necessary for mining safety. In this research, a new yielding steel prop with high stable load capacity was introduced, which features sustaining large deformation in the field. Based on principle stress method and elastic-plastic theory, a mathematical model of load capacity was proposed for the new prop. The results show that the stable load capacity of the prop increases linearly with the increase of the effective number of the steel balls. Meanwhile, the stable load capacity of the prop increases initially and decreases afterwards with the increase of the radius of the steel ball. Under the fixed radius of the steel ball, the stable load capacity will increase with the decrease of the gap between the inner tube and the outer tube. The stable load capacity of the prop calculated using the theoretical model quantitatively agrees with that of the experimental tests, with only an error within 5%.

show abstract

“…The shear behaviour of fully grouted rebar has been tested in laboratory (Chen and Li, 2015). The corresponding 2D-DDA model are shown in An elastic, linear strain-hardening steel model is adopted to simulate the rockbolt material (see Figure 4-16(c)).…”

Section: Verifying Shear Behaviour By Shear Testmentioning

confidence: 99%

“…The curves of the total loads versus displacement from the 2D-DDA simulation results are shown in Figure 4-18. It should be noted that the total force is defined as the squared sum of normal and shear forces, while the total displacement is the horizontal movement of the upper block (Chen and Li, 2015). As shown in Figure 4-19(a), the shear force varies with the shear displacement in different response to the shear angle.…”

Section: Verifying Shear Behaviour By Shear Testmentioning

confidence: 99%

“…As shown in Figure 6-1(c), the rockbolts may be subjected to tension and/or shear loads depending on the angle of rockbolt installation. The shear components may reduce the load capacity of the rockbolt (Chen and Li, 2015). The stable state of rock wedge might change during the stress re-adjustment in the surrounding rock mass during the excavation process (Dwivedi et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reinforcement mechanism of rockbolt system for underground excavation

Nie¹

View full text Add to dashboard Cite

show abstract

Performance of fully encapsulated rebar bolts and D-Bolts under combined pull-and-shear loading

Cited by 90 publications

References 16 publications

Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock‐Like Materials

Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock‐Like Materials

The Load Capacity Model and Experimental Tests of a New Yielding Steel Prop

Reinforcement mechanism of rockbolt system for underground excavation

Contact Info

Product

Resources

About